Stop Sequences
The PCC follows different stop sequences depend-ing on the current setup and conditions.
If a stop sequence is interrupted, the PCC follows these steps to restart the genset.
• If the engine is still running at rated speed, the PCC keeps running the genset at rated speed and voltage. (page2-16).
• If the engine is running at idle speed or is ramp-ing down to idle speed, the PCC raises the en-gine speed from the current speed to rated speed linearly duringIdle to Rated Ramp Time.
The PCC also starts the automatic voltage reg-ulator (AVR), if applicable.
Shutdown with Cooldown
This sequence begins when these conditions are met.
• The PCC is in Auto mode (page2-8).
• The genset is running at rated speed and volt-age (pvolt-age 2-16).
• The remote start signal (page2-9) is inactive.
8. This parameter is not available in the Operator Panel. See Table 4-1 (page 4-1).
9. This parameter is not available in the Operator Panel. See Table 4-1 (page 4-1).
900−0665 (Issue 1)
• The exercise signal (page2-8) is inactive.
• There are no active shutdown faults.
This sequence is shown in Figure2-11.
Time Delay to Stop AND
Idle Cooldown Time RATED
STOP Rated Cooldown Time
Rated to Idle Transition Delay
Rated to Idle Ramp Time Genset Idle Enable
FIGURE 2-11. SHUTDOWN WITH COOLDOWN FIGURE 2-11. SHUTDOWN WITH COOLDOWN
SE-QUENCE QUENCE
In this sequence, the PCC follows these steps to stop the genset.
1. The PCC runs the genset at rated speed and voltage until these conditions are met.
• Time Delay to Stop expires.
• The genset runs at less than 10% of the rated load forRated Cooldown Time.
The PCC waits indefinitely for the load to drop below 10% if Rated Cooldown Time is greater than zero.
2. If Genset Idle Enable is set to Disabled, the PCC stops the genset. The PCC turns off the fuel shutoff (FSO) control. IfECM CAN Enable is set to Enable, the PCC turns off the ECM
key-switch. The PCC stops driving the field wind-ings in the exciter.
If Genset Idle Enable is set to Enabled, the PCC follows these steps.
A. The PCC runs the engine at rated speed for Rated to Idle Transition Delay . If Rated to Idle Transition Delay is greater than zero, event code 1122 (Rated to Idle Tran-sition) becomes active.
B. The PCC reduces the engine speed from rated speed to idle speed linearly during Rated to Idle Ramp Time.
Note: If
Note: If ECM CAN Enable is Enable, the ECM, not the is Enable, the ECM, not the PCC, actually controls the transition from rated PCC, actually controls the transition from rated speed to idle speed.
speed to idle speed.
C. The PCC stops the automatic voltage reg-ulator (AVR).
D. The PCC runs the engine at idle speed for Idle Cooldown Time.
E. The PCC stops the genset. The PCC turns off the fuel shutoff (FSO) control. IfECM CAN Enable is set to Enable, the PCC turns off the ECM keyswitch. Event code 1122 (Rated to Idle Transition) becomes inactive.
The PCC stops driving the field windings in the ex-citer when the PCC stops running the engine at rated speed.
If Delayed Off / Configurable Output #10 Output Function Pointer_ is set to Default, the PCC turns off Delayed Off Delayed Off FSO Relay Time after the PCC stops the genset.
Manual Stop
This sequence begins when these conditions are met.
• The PCC is in Manual mode (page2-10).
• The genset is running at rated speed and volt-age (pvolt-age 2-16).
• In applications where the Operator Panel con-trols the mode of operation, the Stop button is pressed once.
• There are no active shutdown faults.
900−0665 (Issue 1) This sequence is shown in Figure2-12.
Idle Cooldown Time RATED
STOP Rated Cooldown Time
Rated to Idle Transition Delay
Rated to Idle Ramp Time Genset Idle Enable
FIGURE 2-12. MANUAL STOP SEQUENCE FIGURE 2-12. MANUAL STOP SEQUENCE In this sequence, the PCC follows these steps to stop the genset.
1. The PCC runs the genset at rated speed and voltage until the genset runs at less than 10%
of the rated load forRated Cooldown Time. The PCC waits indefinitely for the load to drop below 10% if Rated Cooldown Time is greater than zero.
2. If Genset Idle Enable is set to Disabled, the PCC stops the genset. The PCC turns off the fuel shutoff (FSO) control. IfECM CAN Enable is set to Enable, the PCC turns off the ECM key-switch. The PCC stops driving the field wind-ings in the exciter.
If Genset Idle Enable is set to Enabled, the PCC follows these steps.
A. The PCC reduces the engine speed from rated speed to idle speed linearly during Rated to Idle Ramp Time.
Note: If
Note: If ECM CAN Enable is Enable, the ECM, not the is Enable, the ECM, not the PCC, actually controls the transition from rated PCC, actually controls the transition from rated speed to idle speed.
speed to idle speed.
B. The PCC stops the automatic voltage reg-ulator (AVR).
C. The PCC runs the engine at idle speed for Idle Cooldown Time.
D. The PCC stops the genset. The PCC turns off the fuel shutoff (FSO) control. IfECM CAN Enable is set to Enable, the PCC turns off the ECM keyswitch. Event code 1122 (Rated to Idle Transition) becomes inactive.
The PCC stops driving the field windings in the ex-citer when the PCC stops running the engine at rated speed.
If Delayed Off / Configurable Output #10 Output Function Pointer_ is set to Default, the PCC turns off Delayed Off Delayed Off FSO Relay Time after the PCC stops the genset.
Shutdown Without Cooldown
This sequence begins when one of these conditions is met.
• A shutdown fault (page 5-1) with a response of Shutdown Without Cooldown initiates it.
• The genset is running when the PCC enters Off mode (page 2-8).
• The genset is running when the PCC enters Manual mode (page2-10) and the Start button is not pressed in 250 ms.
This sequence is shown in Figure2-12.
RATED
STOP
FIGURE 2-13. SHUTDOWN WITHOUT COOLDOWN FIGURE 2-13. SHUTDOWN WITHOUT COOLDOWN
SEQUENCE SEQUENCE
The PCC ignores timers and loads and stops the genset immediately.
If Delayed Off / Configurable Output #10 Output Function Pointer_ is set to Default, the PCC turns off Delayed Off Delayed Off FSO Relay Time after the PCC stops the genset.
900−0665 (Issue 1)