Johnson Controls YORK YVAM 0350, Operation & Maintenance Manual

Page: 110 / 162

Table 92: Safety shutdown messages
Message Description
VSD – PHASE B
INPUT DCCT
See the previous message, VSD – PHASE A INPUT DCCT .
VSD – PHASE C
INPUT DCCT
See the previous message, VSD – PHASE A INPUT DCCT .
VSD – PHASE A
MOTOR DCCT
The motor current in each phase of the drive is measured at the beginning of the run command. The
motor current at this time should measure very low. This low value is used as the zero current value
for the rest of this run time. The motor current is then monitored for the next 1.5 seconds to ensure
that a minimum amount of current is flowing to the motor. After 1.5 seconds, if the motor current is
less than 25 A on any phase, then this shutdown is generated. When the condition clears, the chiller
can be started after the Clear Faults button is pressed.
VSD – PHASE B
MOTOR DCCT
See the previous message, VSD – PHASE A MOTOR DCCT .
VSD – PHASE C
MOTOR DCCT
See the previous message, VSD – PHASE A MOTOR DCCT .
VSD – PRECHARGE
LOCKOUT
If the drive fails to complete pre-charge due to VSD – PRECHARGE – LOW DC BUS VOLTAGE 1 or
VSD – PRECHARGE – LOW DC BUS VOLTAGE 2 , the drive starts a 10 second timer before clearing
the fault and allowing another pre-charge to start. The drive’s cooling fan(s) and water pump(s)
remain energized during this time. The drive allows up to three consecutive pre-charge-related faults
to occur. After the third consecutive pre-charge-related fault, this shutdown is generated. When the
condition clears, the chiller can be started after the Clear Faults button is pressed.
VSD – RECTIFIER
PROGRAM FAULT
The drive software contains a verification process to ensure that the correct set of software is
installed in the drive logic board for the application. When this condition clears, the chiller can be
started after the Clear Faults button is pressed.
VSD SHUTDOWN –
REQUESTING FAULT
DATA
The drive has shut down the chiller and the control center has not yet received the cause of the fault
from the drive from the serial communications link. The drive shuts down the chiller by opening
the motor controller VSD Stop Contacts, which is located on the drive logic board and connected
between TB6-16 and TB6-53 in the control center. The Microboard in the control center then sends a
request for the cause of the fault to the drive logic board over the serial communications link. Serial
communications are initiated every 2 seconds. This message is generally displayed for a few seconds
and then replaced with one of the other drive fault messages.
YVAM Control Center 110