Table 91: Cycling shutdown messages
Message Description
VSD SHUTDOWN –
REQUESTING FAULT
DATA
The VSD has shutdown the chiller and the control center has not
yet received the cause of the fault from the VSD, via the serial
communications link. The VSD shuts down the chiller by opening the
Motor Controller VSD Stop Contacts. The control center then sends a
request for the cause of the fault to the VSD over the serial link. Since
serial communications are initiated every 2 seconds, this message is
typically displayed for a few seconds and then replaced with one of the
other VSD fault messages.
VSD – SINGLE PHASE
INPUT POWER
The VSD monitors the input voltage of all three phases. If the input
voltage of any one phase drops below the threshold value for the given
input voltage range below, then this shutdown will occur.
Input voltage range
Input voltage single
phase shutdown value
380/415 264 Volts
460 295 Volts
VSD – STOP (FAULT)
CONTACTS OPEN
See the VSD Shutdown – Requesting Fault Data message above.
If the control center’s does not receive the cause of the Fault over the
Serial Link within 20 seconds, it is assumed it is not forthcoming and
that message is replaced with VSD – STOP CONTACTS OPEN message.
The chiller can be started after manual resets are performed as detailed below. service and
troubleshooting information is contained in the YORK YMC2 Service Manual (Form 160.84-M2) and
Chiller Service (Form 160.84-M1).
Table 92: Safety shutdown messages
Message Description
AUXILIARY
SAFETY –
CONTACTS
CLOSED
The Auxiliary Safety shutdown input, connected to I/O Board TB4-31 senses 115
VAC, initiating a safety shutdown. This input is a general-purpose, user defined
safety shutdown input. The chiller can be started after the contacts open and
the CLEAR FAULT key is pressed.
CONDENSER –
HIGH PRESSURE
The condenser pressure, as sensed by the Condenser Transducer, has increased
to is greater than 200 PSIG for shells with 235 PSIG DWP and 295 PSIG for shells
with 350 PSIG DWP. The control determines the shell DWP by the condenser
model number on the Sales Order Screen. The chiller can be started after the
pressure decreases to is less than 140 PSIG for shells with 235 PSIG DWP and
235 PSIG for shells with 350 PSIG DWP and the CLEAR FAULT key is pressed.
CONDENSER –
HIGH PRESSURE
CONTACTS OPEN
The contacts of the electro-mechanical high pressure safety device, located on
the condenser shell, have opened because this device has detected a pressure
greater than 204±7 PSIG for shells with 235 PSIG DWP and 308±7 PSIG for shells
with 350 PSIG DWP. The contacts will automatically close when the condenser
pressure decreases to is less than 160±10 PSIG for the 235 DWP shells and
230±10 PSIG for the 350 DWP shells. The chiller can be started after the contacts
close and the CLEAR FAULT key is pressed.
125
YMC
2
Mod B with OptiView
™
Control Center
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