Table 91: Cycling shutdown messages
Message Description
VSD INITIALIZATION
FAILED
Upon application of power, all boards go through the initialization
process. At this time, memory locations are cleared, program jumper
positions are checked and serial communications links are established.
If this process is not completed the OptiView panel will indicate this
fault. There are several causes for an unsuccessful initialization as
follows:
• Serial data communications must be established. See VSD –
Serial Communications fault. If communications between
the VSD Logic Board, and control center Microboard does not
take place during initialization, this message will be generated.
The Serial communications can be verified by selecting the VSD
DETAILS screen from the MOTOR screen and observing the
Full Load amps value. A zero displayed for this and other VSD
parameters, indicates a serial communications link problem.
VSD – INVALID
SETPOINTS
The VSD Logic Board is able to determine which model of drive can run
which model of motor. If the Control Center provides a model of motor
that is not compatible with this model of VSD, then this shutdown is
generated. When this condition clears, the chiller can be started after
the CLEAR FAULTS key is pressed.
VSD – LOGIC BOARD
POWER SUPPLY
This shutdown is generated by the VSD logic board and it indicates
that the low voltage power supplies for the logic boards have dropped
below their allowable operating limits. This message usually means the
power to the VSD has been removed.
VSD – LOGIC BOARD
PROCESSOR
This shutdown is generated if a communications problem occurs
between the two microprocessors on the VSD Logic Board.
VSD – LOW DC BUS
VOLTAGE
This shutdown is generated any time after the pre-regulation state
has generated the correct DC link voltage setpoint and then the DC
link voltage drops to a minimum value. This value is based on the
drive model number. Typically, this shutdown will occur when there
is a sudden change in the input voltage due to storms, utility power
problems, or site power problems.
Drive model DC link voltage setpoint
0490, 0490A, 0612A, 0730A 0774 755
1278A 735
VSD – LOW PHASE
A INPUT BASEPLATE
TEMPERATURE
The temperature of the input baseplate phase A has decreased below
the low limit of 37°F (2.7°C). All phase temperatures have to increase
above the fault-reset threshold of 42°F (5.5°C), for this fault to be
cleared. The cooling fans and pumps will turn on while this shutdown is
present. They will turn off when the temperature rises above the fault-
reset threshold.
VSD – LOW PHASE
B INPUT BASEPLATE
TEMPERATURE
See VSD – LOW PHASE A INPUT BASEPLATE TEMPERATURE message
preceding.
VSD – LOW PHASE
C INPUT BASEPLATE
TEMPERATURE
See VSD – LOW PHASE A INPUT BASEPLATE TEMPERATURE message
preceding.
YMC
2
Mod B with OptiView
™
Control Center
122
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