Index Object Definition
1 User defined name Alphanumeric name of signal up to 16 characters in length.
2 Load tap changer Allows user to enable or disable the Load Tap Changer Monitor.
3 Tap position module Drop-down menu specifying the signal which monitors the tap positions..
4
Number of taps The total number of taps to be monitored.
Examples: If the system range is -16 - +16, enter 33.
If the system range is -8 - +8, enter 17.
5 Number of lowest tap 6
5
7 1
2 3
4
8 9
10 11
12
6 Tap count period
The number of hours within which the user wants to count the total number of taps. This is a good indication of how much activity the tap changer detects within a limited period of time. This is selectable from 1 - 24 hours.
7 Motor current Drop-down menu specifying the input signal which measures the motor current of the tap position changer.
8 Switch contact 0
Drop-down menu specifying the switch closure input signal which detects when the tap changer motor actuates.
If only one switch closure input module is used to detect motor actuations, you must select it in this field and not in the Switch contact module 1 field.
9 Switch contact 1
Drop-down menu specifying the second switch closure input signal which detects when the tap changer motor actuates. This only occurs if the QTMS installation uses two switch closure input signals for the actuation detection (as in an up relay and a down relay).
10 Load current Drop-down menu specifying the current input signal, if the user is measuring make and break currents of the different tap positions.
11 Temperature sensor 1
Drop-down menu specifying RTD sensor, measuring the differential temperature of the tap changer with respect to the main tank. This can detect coking of the tap contacts.
12 Temperature sensor 2 Drop-down menu specifying a second RTD sensor, measuring the differential temperature of the tap changer with respect to the main tank.
LTC High/Low Priority Alarm Configuration
The QTMS provides for the configuration of two levels of LTC alarming - High and Low.
The configuration fields monitor the status of real-time LTC operation and are covered in this section.
The Low Priority alarm is informational and is used to alert the user of certain conditions of the LTC monitor. The High Priority alarm is defined as critical and alerts the user to current status of the LTC monitor that needs attention.
Alarm Relay Configuration
The Alarm Relay section defines the alarm relay that actuates whenever a LTC monitor alarm setpoint is exceeded.
Index Object Definition
1 Alarm relay
Selects the relay signal that actuates if any of the selected parameters exceed the setpoint values.
CAUTION: Do not select the same relay for both the high-priority alarm and low-priority alarm.
Doing so may cause erratic relay operation.
Important:
This alarm relay is configured in this window and not in the Output Relay Setup window. If the selected relay was assigned earlier to function as a matrix-controlled relay, it will no longer operate for that function. Conversely, if you open the Output Relay Setup window and reconfigure the alarm relay that you selected here as a matrix-controlled relay, the relay will no longer operate as a load tap changer alarm relay.2 Relay function Checking this box enables the relay function. When the relay is disabled, it remains in the de-energized state.
3 Relay operation Checking this sets the actuation of the relay to either Failsafe or Non-failsafe.
For more information, see Relay Output Failsafe.
4 Test lockout
Checked - The alarm relay does not change states when the TEST button on the front panel of the 509ITM is pressed.
Unchecked - The alarm relay momentarily changes states when the TEST button on the front panel of the QTMS is pressed.
For more information, see HMI Test button.
1
5 Latching Relay
Checking this box enables latching of the alarm relay latch if the setpoint is exceeded.
Example: If the motor current exceeds the setpoint, the latched relay actuates and remains actuated, even when the motor current returns to a normal operating value. A latched relay may be reset if the actuating signal no longer exceeds the setpoint and the customer presses the RESET switch on the front panel of the unit during normal
operations (scrolling display).
For more information, see Relay Output Latching.
6 Actuation Delay The delay time, in hours, minutes, and seconds of the actuation of the alarm relay after the control signal has continually exceeded the setpoint threshold.
Tap Count Setpoint
Index Object Definition
1 Tap count setpoint The setpoint value that actuates the alarm relay if any individual tap count equals or exceeds this value.
2
Alarm on multiple tap
movements Checking this box enables the actuation of the alarm relay if a multiple tap movement occurs during one tap actuation.
3 Tap run time setpoint The setpoint value, entered as hours(?), that actuates the alarm relay if the total run time of any individual tap position equals or exceeds the value.
4
Tap count period
setpoint The number of taps that when equals or exceeds this value, actuates the alarm relay.
5 Alarm (Enable) Checking this box enables the particular alarm function for the fields described above.
1 2
3 4
5
Last Running Motor Current Setpoint
This section defines the motor current setpoints for the High and Low Priority alarms.
Index Object Definition
1
Last running motor current
Displays the last measured steady-state current value of the tap position motor.
This field is for informational purposes, but it can be used as a guide for determining the setpoint values in the Upper Setpoint and Lower Setpoint fields.
2 Upper setpoint The setpoint value that actuates the alarm relay if the steady-state current equals or exceeds the value.
3 Lower setpoint The setpoint value that actuates the alarm relay if the steady-state current equals or falls below the value.
4 Alarm (Enable) Checking this box enables the alarm relay to energize when the motor current setpoint is exceeded.
Last Starting Motor Current Setpoint
This section defines the motor starting current setpoints for the High and Low Priority alarms.
Index Object Definition
1
Last Starting motor current
Displays the last measured inrush current value of the tap position motor.
This field is for informational purposes, but it can be used as a guide for determining the setpoint values in the Upper Setpoint and Lower Setpoint fields.
2 Upper setpoint The setpoint value that actuates the alarm relay if the steady-state current equals or exceeds the value.
1
3 Lower setpoint The setpoint value that actuates the alarm relay if the steady-state current equals or falls below the value.
4 Alarm (Enable) Checking this box enables the alarm relay to energize when the starting motor current setpoint is equaled or exceeded.
Motor Actuations Setpoint
This section defines the motor actuations setpoints for the High and Low Priority alarms.
Index Object Definition
1
Motor actuations
setpoint The setpoint value that actuates the alarm relay if the number of motor actuation counts equals or exceeds this value.
2
Motor actuations preset
Displays the total number of motor actuation counts detected up to this point in time.
The user can view the number and leave it as is, or he or she can reset or preset the count by entering a new number.
3 Alarm (Enable) Checking this box enables the alarm relay to energize when the motor actuations setpoint is equaled or exceeded.
Motor Actuation Time Setpoint
This section defines the motor actuation time setpoints for the High and Low Priority alarms.
Index Object Definition
1
Motor actuation
setpoint The maximum setpoint time for the motor actuation to occur before actuating the alarm relay.
2 Alarm (Enable) Checking this box enables the alarm relay to energize when the motor actuation time setpoint is equaled or 1
2
4
1 2
exceeded.
Temperature Setpoint
This section defines the temperature setpoints for the High and Low Priority alarms.
Index Object Definition
1 Temperature Setpoint The setpoint value that actuates the alarm relay if the differential measurement equals or exceeds the value.
2
Temperature Hysteresis
Selects a switching differential of the temperature that is required to de-actuate the alarm relay. If the temperature exceeds the setpoint, the alarm relay actuates. For the alarm relay to de-actuate, the temperature must fall below the setpoint minus the hysteresis.
The reason for entering a hysteresis value is to prevent the relay from “chattering” (toggling on and off rapidly) when the signal exceeds the setpoint value.
Example: If the Temperature Setpoint field is set to 10°
C and the Hysteresis field is set to 3° C, the relay will actuate when the difference in temperature reaches 10°
C, but will de-actuate at 7° C (10 - 3 = 7).
3 Alarm (Enable) Checking this box enables the alarm relay to energize when the temperature setpoint is equaled or exceeded.
LTC Monitor Control Buttons
The control buttons allow the user to load LTC configuration parameters into system memory, cancel the window, or enter calibrate mode.
Index Object Definition
1
Load LTC
Configuration Enters all variables displayed in the window into the system.
2 Cancel Erases any changes made to this window during the current session and returns all variables to the previous 1
2
3
1 2 3
values.
3
Calibrate Pressing this button enters the LTC Monitor into calibration mode.
See LTC Calibration for the LTC calibration procedure.