Step 3 (localizing)
X- ray timeout test
switched on/off only from the XC (X-ray release) signal, which is sent at the beginning of the scan from UMAR to XGS/XGR. For safety reasons, a timer in XGS/XGR is started as soon as the radiation is switched on (> 20 kV) triggered from the XC signal. If the XC signal is not switched off before the internal XGS/XGR timer exceeds its 108% limit, the scan is switched off by the internal timer. If the test fails at CT_GSA/GRA_113 (XGR Scan Time Exceeded) is sent to the Eventlog.
Remark: Test requires the system to be in stand-by status. X-ray timeout TSG
Tab. 63 X-ray timeout TSG
Performing the test
1. Select Local Service > Test Tools > Sys Tests > XRay Timeout 2. Select relevant parameters.
3. Click GO and follow the instructions in the dialog. The test is terminated automatically. If a test fails, follow the TSG described next.
Dyn. Collimation
0In short spirals, a significant fraction of the dose is normally applied during the overscan phases at the beginning and end of the scan. A dynamic shutter can drastically reduce this overscan dose. Effective dynamic shutter requires collimator plates each capable of fully closing the aperture and moving at considerable speed. The only way to prove that the blades are moving correctly in time is to measure the dose length product. With this test, the correct function of the dynamic collimation is checked so that the raw data are checked for expected values after a spiral scan. If the expected values are within tolerance, it is an indication that the dynamic collimation is functioning (blades of TCO are moving correctly). If not, troubleshooting has to start as described below.
Remark: Test requires the system to be in stand-by status
Step Action
1 Check the Eventlog for the CT_GSA/GRA_113 error message. Follow the instructions given in the extended error message.
Dyn. Collimation TSG
Tab. 64 X-ray timeout TSG
Performing the test
1. Select Local Service > Test Tools > Sys Tests > Dyn Collimation
2. Select parameters (RotSpeed, pitch, table movement, granularity use default)
3. Click GO and follow the instructions in the dialog. The test is terminated automatically.
Step Action
1 Perform Dyn. Collimation test (see below) > perform 1 test with minimum and 1 test with a maximum of parameters (granularity > use default). The test result is displayed in a table which is shown after the end of the test.
> if the test is not successful (one or more red bars) > save raw data file (E:ser- vice/icsraw > DynCol.raw) onto CD and send it to HSC. HSC forwards it to the lab > continue with item 2.
> if the test is successful (grey or green bars) > dynamic collimation is ok. No further action.
13-
13Cooling System
Water cooling
0General
0The water cooling system provides heat dissipation for the gantry electronics and X-ray tube. The 3-way bypass valve on the incoming cold water and the variable-speed fan reg- ulate the internal air temperature of the gantry. Both are controlled from the Electronics Box containing control boards and connected to sensors for the water and air. The Electronics Box connects to the system by the CANopen bus. The fan assembly contains its own Fan Motor Control Board which connects to the Electronics Box. The fan in the lower-right gan- try stand cools all rotating parts; there are no other fans in the rotating gantry.
A condensate-collection system collects condensed water below the radiator and automat- ically pumps it away to a drain. The condensate pump connects electrically to the electron- ics box.
If the temperature in the gantry or the temperature of the incoming water exceeds limits, the Electronic Box issues messages to the UMAS.
For sites using the Water-Air Split Cooling Unit, an interface to it is provided on the elec- tronics box (X6).
Fig. 95: Electrical circuit
TSG Water Cooling
0General troubleshooting process steps:
1. If possible, try to determine if the problem is EXTERNAL or INTERNAL to the gantry. Check the eventlog. Current Cooling State shown in Table T00, and LEDs on the Elec- tronics Box. If the problem appears to be external, seek possible resolution in Hospi- tal/Facility-Chilled Water System or with Split Air/Water Unit (Option). Continue to evaluate the internal gantry conditions if the external ones are verified as OK or cannot be determined immediately.
2. If the problem is INTERNAL to the gantry, look at the eventlog. Current Cooling State shown in Table T00, observe the LEDs on the Electronics Box. Use the laptop service connection to the Electronics Box described below.
3. Replace suspected defective parts.
Information sources
1. Messages in the eventlog:
Review the eventlog for warning and error messages from the WCS, and troubleshoot based on these errors. You can filter the eventlog on the text “COOLING” to see only cool- ing errors.
¹ If you cannot access the eventlog for any reason, you can connect a service lap- top directly to the Cooling Electronics Box (# 4 below).
The following 2 INFORMATION messages in the eventlog are useful to determine possible changes in the cooling conditions. Even if there are no warning or error messages.
NOTE These messages are INFORMATION-priority. Switch on the INFO messages to display them in the eventlog.
Also, they are only generated when a certain amount of change has occurred. For a readout of the current state of these values, see Step 2, “Table T00” shown below.
Fig. 96: Message MAS220
Message about the COOLING SECONDARY (GANTRY) SIDE:
Fig. 97: Message MAS212
To determine what value is being displayed, look at the P1 value in the actual message shown in the eventlog. Find this HEX number on the list of “Parameter 1: Supervision ID numbers” in the expanded message (above). P3 & P4 show the actual value in HEX.
NOTE It is necessary to convert HEX to decimal to read the value. Use the Windows Calculator in the Scientific mode (WinXP Programs > Accessories > Calculator > View > Scientific). Click HEX button to enter the values of P3 and P4, then press DEC button. Remember that temperature values are given in 1/10th degree (e.g., 247 = 24.7 degrees C).
2. Current system cooling status using table T00:
Using the Service Software function Control > Table Load/Modify, open table “T00” from “Volatile.” The current state of the various sensors is shown in the data fields of T00. Com- pare the current state to the nominal values shown in the following screenshot to determine if the actual values displayed reveal any strong deviations.
NOTE DO NOT change the values in any of the tables!
3. LEDs on WCS electronics box:
The 3 LEDs at the left side of the Electronics Box are status indicators. In the normal mode of operation, only the green LED (H1) flash. The yellow LED (H2) is illuminated if a warning (e.g. temperature out of tolerance) occurs. And also briefly lights whenever the control board is switched on (initialization). During an error condition (e.g., fan error), the red LED (H3) is on continuously.
4. Additional information: Laptop service connection to electronics box
NOTE All messages mentioned below are sent to the Eventlog. Use the laptop connection only if you are familiar with a ter- minal emulator program.
Note: All messages mentioned below are also sent to the Eventlog. Use the Laptop con- nection only if you are familiar with a terminal emulator program.
Connect the laptop PC serial port to the Service connector. On the Electronics Box with a null-modem cable and running a terminal emulator program such as HyperTerminal. Example:
>sta
>UpTm: 54:46 C:1 E:0 LE:250 I/Yf:6000/290 LA:200 I/Ym:0/0 Pos:0WE: 100 WA:150 FS:584
The number after the letter E: indicates the warning or error message code. E:0 indicates no warning or error.
Error Alarms (RED LED on electronics box illuminated):
Code Warning messages via the laptop
10 / 110
Cooling unit exhaust air temperature (into gantry) to low
•
Control valve - electrical connection is faulty - Check wiring connection at valve.•
Control Valve is not working - Try turning the valve knob manually, see if it “responds” by returning to its original position. If so, probably OK (repeat several times). If it does not return to its original position, replace valve drive unit, electronics box, sensors, valve.11 / 111
Exhaust air temperature of cooling unit (into gantry) is too high
•
Same cause/action as code 10 above. 20 /120
Hospital supply water temperature is too low (<4 degrees C)
•
Look for a thermometer on the hospital incoming water lines and verify that the coolant is 4-12 degrees C. Contact hospital facility engineers if out of range. If the hospital water supply is OK, check/replace sensor for incoming water temperature.21 / 121
Hospital supply water temperature is too high (greater 12 degrees C)
•
Look for a thermometer on the hospital incoming water lines and verify that the coolant is 4-12 degrees C. Contact hospital facility engineers if out of range. Check if the hospital water is filtered, and if so, check if the water filter is clogged (briefly open bypass valve). If the hospital water supply is OK, check sensors for the hospital water temperature and flow. Shut off incoming water valve (red handle 90 degrees) and monitoring the sensors with Table Load/Modify of Table T00: temperature and flow indications respond. 30 /130
Gantry temperature is too low (< 22 degrees C).
•
Gantry temperature regulation is not working properly. Replace: control valve drive / control valve, electronics box, sensors.31 / 131
Gantry temperature is too high (>30 degrees C).
•
Gantry temperature regulation is not working properly. Verify the sensor con- nection (if not connected, this error results). Replace: control valve drive / control valve, electronics box, sensor, fan (if not blowing).Code Warning messages via the laptop 210 Error in fan controller
•
Fan connection to the electronics box is not connected. Check the electrical connection between fan and Electronics Box (connectors 1X1 and 1X2).•
Fan bearing has seized. Check that the fan rotor turns easily - DISCON- NECT FAN POWER before touching the fan blades.•
Controller or fan has failed - replace fan assembly. 220 Spirit level in condensate pan is too high•
Check spirit level in condensate pan, function of the condensate pump and switch, and make sure that the clear hoses are OK. Verify the electrical con- nection of condensate pump to Electronics Box (connector 1X3).230 Fan speed too low
•
Check connection between electronics box and fan (connectors 1X1 and 1X2). Replace Electronics Box, fan assembly.1010 / 1011
Sensor R1 error: exhaust air temperature to gantry
•
Check/replace sensor R1, connector 2X4. 1020 /1021
Sensor R2 error: air inlet temperature from gantry
•
Check/replace sensor R2, connector 2X4. 1050 /1051
Sensor R3 error: water outlet temperature or flow
•
Verify the proper temperature and adequate flow of incoming hospital water. Check/replace sensor R3, connector 2X4.1060 / 1061
Sensor R4 error: water inlet temperature
•
Verify the proper temperature of incoming hospital water. Check/replace sensor R4, connector 2X4.14-
14PDC_A cabinet
General overview
0The PDC can be divided into 3 separate functions:
•
Power distribution located in the lower part of the PDC•
XGS located in the upper part of the PDC•
UPS located at the lower right (standard component in the PDC)The PDC cabinet is always delivered with the power matching transformer T1:
•
Transformer T1 adapts the on-site line voltage (380 V to 480 V) to internal 400 V.Fig. 99: PDC cabinet - overview
Pos. 1 Schematic overview Pos. 2 Detailed overview
Power distribution
14.1 The power distribution in the PDC cabinet distributes the line voltage power at the required adapted voltages to all system components and their subsystems.Errors and troubleshooting hints
0As a result, an error in the power distribution can generate various errors at different system components. Refer to the following table for actions based on the type of error.
Tab. 65 Table of possible errors and hints
Error Cause Action
Complete system does not come up (UPS may supply power to ICS/IES/IR S for ~30 minutes)
F1 tripped Switch ON circuit breaker F1 and monitor its function.
•
If F1 does not trip again:¹ RCD F18 (yellow box) detected >50% leakage current once.
- Check for unstable facility incoming power - Check on-site cabling
- Check cabling in PDC
- Check cabling from the PDC to the subsystems - See also (Residual current monitor F18 / p. 199)
•
If F1 trips again:¹ RCD F18 (yellow box) detects >50% leakage cur- rent continuously.
- Check ALARM LED (yellow) at F18 (LED does not blink, only goes ON for a short time).
- Check for unstable facility incoming power - Check on-site cabling.
- Check cabling in PDC
- Check cabling to sub-systems
¹ Relay K2 is faulty (T1 temperature sensing) - Check LED on K2 while switching ON F1 ¹ T1 transformer temperature is too high, holding
K2 off (T1 Temp switch or wiring open).
¹ Overcurrent between F1 and T1, e.g. faulty isola- tion, short circuit at connection terminal T1. F20 tripped 24-V power supply U1 is faulty; see (24 Volt power supply
No function in individ- ual system compo- nents Circuit breaker for the compo- nent is tripped
Switch ON the circuit breaker for the system component and monitor its function. If the circuit breaker trips again, the power input of the component is defective. Trouble- shoot the component.
Relay for the component is not switching on
•
Check where the supply voltage of the relay comes from (in the Function Description) and determine what circuit breakers or other relays supply it.ICS, IES, IRS, UMAS not coming on
UPS not com- ing on
•
Check if the UPS power switch is on (LEDs on front of UPS).•
Check F10 (UPS Input) and F16 (UPS Output).•
Check whether the circuit breakers at the back of the UPS have tripped; see (Fig. 110 / p. 207).•
See (UPS / p. 206) for more information. LEDs OFF at all pro- tection devices (Pos. 8 in (Fig. 100 / p. 195)F12 tripped Switch ON circuit breaker F12 and monitor its function:
•
If F12 does not trip again¹ Test function of F18 with the TEST switch. ¹ Check LEDs of K1, K2, K12, F18.
•
If F12 trips again¹ Check cabling and components that are con- nected to K1, K2, K12, F18, shunt trips at certain circuit breakers.
Overview
0Fig. 100: Power distribution in PDC_A - overview
Pos. 1 Fuses F1, F2, F4, F5, F6, F3 (from left to right) Pos. 2 Service push-button S1
Pos. 3 Relays K24, K23, K22, K21, K20, K19, K18, K17, K16, K15, K14, K11, K7, K6, K5 (from left to right) Pos. 4 Relays K25, K10, K9, K8, K3 (from left to right)
Pos. 5 24 Volt power supply for U1
Pos. 6 Fuses F7, F8, F9, F10, F11, F12, F13, F14, F15, F16, F17, F20, F21, F22 (from left to right) Pos. 7 Overvoltage protection
Pos. 8 Residual current monitor F18; relays K2, K1 Pos. 9 Line voltage terminal for on-site power cable
Pos. 10 Service power socket X140, X141; power sockets X108, X109 for Ethernet switches Pos. 11 Transformer T1
Pos. 12 UPS incl. accumulator pack (behind cover) Pos. 13 External Ethernet switch
Pos. 14 Internal Ethernet switch
Circuit breakers and relays
0•
Refer to (Fig. 101 / p. 198) for the locations of the circuit breakers and protection devices.•
Refer to (Fig. 100 / p. 195) for a general overview of the location of the circuit breakers and relays.Notes
•
Check by measuring the voltage at the connection point of every component/ subcom- ponent to see whether:- The component/ sub-component does not work.
- The supply voltage for a certain component / subcomponent is missing. - A corresponding error message is generated.
The following table shows the circuit breakers, relays, and connection points required to switch ON/OFF and to protect some system components independently:
Tab. 66 Circuit breakers and relays - primary
Tab. 67 Circuit breakers and relays - secondary
Connected load Circuit breaker via relay Connection /check point Entire PDC F1 1, F18 2
1. Line voltage circuit breaker
2. Only active if F12 (secondary) is ON
n.a. Pin 2/4/6 of F1
XGS F2 n.a. Pin 1/3/5
Connected load Circuit breaker via relay Connection /check point All sub-systems
/components
F4 n.a. Pin 1/3/5
UPS input F10 n.a. X108, Pin A1, A2 (N)
Patient table PHS F7 K7 X101, Pin 1, 2 (N)
Cooling unit 1
1. Integrated in gantry
F3 K11 X103, Pin A1, A2, A3, B1 (N)
Gantry, stationary part
F6 n.a. X100, Pin A1, A2, A3, B1 (N)
2
2. Note: Pin B3 is still under voltage via the UPS although F6 has tripped or is switched OFF Gantry, rotating part F5 K83, K9 /K104
3. Switches permanent power for rotating part of the gantry
X102, Pin A1, A2, A3, B1 (N) Service socket 5
(230 V, AC)
F9 n.a. X140, L1/N
X141, L1/N
REPO contact F20 K3 X20, Pin 5.1/5.2
Service socket 6 (230 V, AC)
Tab. 68 Circuit breakers and relays - components supplied by the UPS
4. Charge circuit for rotating generator 5. Type: Schuko
6. Type: Schuko
Connected component Circuit breaker via relay Connection /check point
All components (connected to the UPS)
F16 n.a. X109, Pin A1, A2
Ethernet power socket_11
1. Type: Schuko
F11 K3 X106, Pin L1/N
Ethernet power socket_2 2
2. Type: Schuko
F17, F14 K3, K5 X107, Pin L1/N
ICS F17, F13 K3, K5 X104, Pin 1/2
IES F17, F14 K3, K5 X110, Pin 1/2
IRS F17, F15 K3, K6 X105, Pin A1, A2
UMAS F11 K3 X100, Pin B3, B1
Power supply XGS F11 K3 X003, Pin 2/3/4 (PE)
Power supply 15/24 V for XGS_Control
F22 K3 X159, L/N
Fig. 101: Circuit breakers and protection devices in PDC - locations
Pos. F1 (circuit breaker) Pos. F2 (circuit breaker) Pos. F4 (circuit breaker) Pos. F5 (circuit breaker) Pos. F6 (circuit breaker) Pos. F3 (circuit breaker) Pos. S1 (service push-button)
Pos. Designation from left to right: F7/F8/F9/F10/F11/F12/F13/F14/F15/F16/F17/F20/F21/F22 (circuit breakers) Pos. F19 (varistors and overvoltage protection)
Pos. F18 (residual current monitor) Pos. K2 (coupling relay)
Fig. 102: Relays in PDC - locations
Pos. 1 Relays K24/K23/K22/K21/K20/K19/K18/K17/K16/K15/K14 (from left to right) Pos. 2 K11 Pos. 3 K7 Pos. 4 K6 Pos. 5 K5 Pos. 6 K25 Pos. 7 K10 Pos. 8 K9 Pos. 9 K8 Pos. 10 K3
Residual current monitor F18
0F18 is a residual current monitor. It monitors the 3 input phases of the system via T2 (cur- rent transformer) for symmetry. The resulting current of the 3 phases and the correspond- ing neutral (to and from the system) must be zero.
•
If the resulting current exceeds a certain value, the power supply is switched OFF via the current circuit breaker F1.•
A warning is generated if 50% of the error current is present for at least 2 sec.•
Refer to (Fig. 103 / p. 200) for illustration of F18.Tab. 69 Residual current monitor F18
Fig. 103: Residual current monitor F18
Pos. 1 TEST button Pos. 2 LED “ON” (green) Pos. 3 LED “ALARM” (yellow) Pos. 4 RESET button
Service pushbutton S1
0•
Refer to (Fig. 100 / p. 195) for a general overview of the location of S1.•
Refer to (Fig. 104 / p. 201) for the illustration of S1.The PDC has a service push button S1 that switches OFF the following circuit breakers remotely:
•
F6/ F11 (stationary part of the gantry; including UMAS)•
F5 (rotating part of the gantry)•
F2 (stationary generator XGS)•
F3 (cooling unit)Indicator Status Function
LED “ON” ON Monitor in operation.
LED ”ALARM” BLINKING Leakage current is ≥ 50%. OFF Leakage current is < 50%.
Test switch PUSHED Generates a leakage current into T2 and must switch OFF circuit breaker F1 immediately.
Reset switch PUSHED ALARM LED can be reset with the RESET switch to check if the error is reproducible.