14
YORK INTERNATIONAL
B. PLC Failure Shutdown
The PLC (Program Logic Control) has been pro-
grammed to output a signal to a watchdog timer.
If the PLC fails to output this pulse to the watch-
dog timer, the engine will shut down to assure
that the engine does not run out of control.
C. Sensor Failure Shutdown
If any of the sensors fail, the engine control panel
and engine ignition system can no longer control
and monitor the engine. The engine is set to shut
down if this occurs to assure that the engine will
not fault, and further endanger the engine and op-
erator personnel.
D.
Safety Shutdown Emergency Stops Purge
Procedure (Also see page 53)
Safety shutdowns can be intiated by the Engine
Control Panel (ECP) or by the YORK Micro Panel.
Safety shutdowns also require
both panels
to be
reset. The followign procedure should be followed
to reset the system after a safety shutdown:
NOTE: The system will run through a safety
shutdown sequence when a safety shut-
down has occurred. The sequence will
include running the Compressor Lubri-
cation Pump and the Gear Box Lubrica-
tion Pump for up to four (4) minutes.
The following procedure will not be able
to completely be carried out until the sys-
tem has run through this shutdown se-
quence.
Wait for the sequence to com-
plete before executing the following
procedure (with exception A) to al-
low for proper lubrication of the com-
pressor and the gearbox.
1. Press the
ALARM SILENCE
push-button on
the ECP to turn the horn off.
2. Move the
ENGINE CONTROL SWITCH
to
the
OFF/RESET
position to reset the ECP.
Leave the
ENGINE CONTROL SWITCH
in
this position until this procedure is complete.
3. Press the
DIAGNOSTIC RESET
if the safety
shutdown was initiated by the EIS system or
caused an
EIS SHUTDOWN DIAGNOSTIC
.
4. Place the
START/RUN/STOP
toggle switch on
the YORK Micro Panel to the
STOP
position.
5. Press the
WARNING RESET
push-button on
the YORK Micro Panel to reset the system.
NOTE: If the compressor lubrication pump
is still running, the system will not reset.
6. Place the engine control switch in the
EN-
GINE MAINTENANCE
mode, and turn the
ENGINE MAINTENANCE SPEED CONTROL
switch to the
PURGE
position.
7. Turn the
ENGINE MAINTENANCE CONTROL
switch to the
START/RUN
position and hold
for fifteen (15) seconds. Return the switch to
the
STOP
position.
8. Repeat steps 1 through 5 to reset the system.
9. Place the
ENGINE CONTROL SWITCH
(ECP) back in the
AUTO
position and close
the door.
10. The system should now be reset.
3. Safety Shutdowns Emergency Stops (Also see
page 53)
Safety shutdowns can be initiated by the Engine Con-
trol Panel (ECP) or by the YORK Micro Panel. Safety
Shutdowns will also require
both
panels to be reset.
Safety Shutdowns are distinguished from standard
shutdowns in that the shutdown occurs very quickly
to avoid potential equipment damage. The following
procedure should be followed to reset the system af-
ter a safety shutdown:
NOTE: The system will run through Safety Shut-
down sequence when a safety shutdown has
occurred. The sequence will include running
the Compressor Lubrication Pump and the
Gear Box Lubrication Pump for up to four
minutes. The procedure will not be able to
completely be carried out until the system
has run through this shutdown sequence.
WAIT FOR THE SEQUENCE TO COM-
PLETE BEFORE FOLLOWING THE BE-
LOW PROCEDURE (WITH THE EXCEP-
TION OF A) TO ALLOW FOR PROPER
LUBRICATION OF THE COMPRESSOR
AND GEAR BOX.
DO NOT CYCLE
POWER TO CLEAR FAULTS.
1. Press the ALARM SILENCE push-button on the
ECP to turn the horn off.
2. Move the Engine Control Switch to the OFF/
RESET position to reset the ECP. Leave the
Engine Control Switch in this position until this
procedure is complete.
3. Press the DIAGNOSTIC RESET if the Safety Shut-
down was initiated by the EIS system or caused
an EIS Shutdown Diagnostic.
4. Place the START/RUN/STOP toggle switch on the
YORK Micro Panel to the STOP position.
5. Press the WARNING RESET push-button on the
Micro Panel to reset the system. Must be in
SERVICE Mode (page 37).
NOTE: If the Compressor Lubrication Pump is
still running, the system will not reset.
6. Place the Engine Control Switch (ECS) back in
the AUTO position and close the door.
7. The system should now be reset.
8. Push START/RUN/STOP toggle switch on YORK
Micro Panel to START to restart the chiller.
