Table 92: Safety shutdown messages
Message Description
VSD –
PRECHARGE
LOCKOUT
If the unit fails to complete pre-charge (due to VSD – PRECHARGE – LOW DC BUS
VOLTAGE or VSD – PRECHARGE – HIGH DC BUS VOLTAGE), the VSD shall time
10 seconds before clearing the fault and allowing another pre-charge to start.
The unit’s fan(s) and water pump(s) shall remain energized during this time.
The VSD shall allow 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 key
is pressed.
VSD –
RECTIFIER
PROGRAM FAULT
The VSD software contains a verification process to ensure that the correct
set of software is installed in the VSD logic board for the application. When
this condition clears, the chiller can be started after the CLEAR FAULTS key is
pressed.
VSD SHUTDOWN
– REQUESTING
FAULT DATA
The VSD has shut down 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” (located on the VSD 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 VSD Logic Board 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.
139
YMC
2
Mod B with OptiView
™
Control Center
To Next Page
Loading...
