Table 92: Safety shutdown messages
Message Description
VSD – INPUT
DCCT OFFSET
LOCKOUT
If three consecutive VSD – Phase A, B or C Input DCCT Offset cycling faults occur,
this safety shutdown is generated to require investigation and manual reset.
When the condition clears the chiller can be started after the CLEAR FAULTS key
is pressed.
VSD –
INVERTER
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 – LINE
VOLTAGE PHASE
ROTATION
The input voltage to the VSD is not phase rotation sensitive, but the VSD must
be able to determine the correct input phase rotation. If the VSD logic board
cannot determine the correct phase rotation, then this shutdown is generated.
When this condition clears, the chiller can be started after the CLEAR FAULTS key
is pressed.
VSD –
LOGIC BOARD
HARDWARE
After power is applied to the chiller, the VSD logic board performs several
internal tests to ensure proper operation of the input power device. If the tests
fail, then this shutdown is generated. When this condition clears, the chiller can
be started after the CLEAR FAULTS key is pressed.
VSD – LOGIC
BOARD PLUG
A jumper is located in the rectifier and inverter current transformers connectors
that indicate the connector is correctly installed. If either connector is not
installed, then this shutdown is generated. When the condition clears, the chiller
can be started after the CLEAR FAULTS key is pressed.
VSD – MOTOR
CURRENT
IMBALANCE
Each phase of motor current is compared against the average of the three
phases of motor current to determine the current imbalance value. If the
current imbalance value is greater than 32 amps for a period of 45 seconds,
then this shutdown is generated. For example: The three motor current RMS
values are 200, 225, and 240 amps. This would be calculated to an average
current of (200 + 260 + 240)/3 = 233 amps. Subtract the real current value from
the average value. 200 – 233 = 33, 260 – 233 = 33, 240 – 233 = 7. If this condition
or worse were maintained for 45 seconds, then this shutdown is generated,
because the motor current imbalance is 33 amps. The chiller can be started after
the CLEAR FAULTS key is pressed.
VSD – 105%
MOTOR CURRENT
OVERLOAD
The 105% motor current overload value is based on the highest output current
compared to the programmed Motor Current value displayed on the Control
panel. The 105% motor current overload value is 1.05 times the programmed
Motor Current value displayed on the Control panel. The motor current overload
value must be greater than the shutdown value for 40 continuous seconds for
this shutdown to occur.
Drive model Maximum motor current overload shutdown value
0490, 0490A 490 Amps
0612A 612 Amps
0730A 730 Amps
0774 774 Amps
1278A 1278 Amps
When the condition clears, the chiller can be started after the CLEAR FAULTS key
is pressed.
137
YMC
2
Mod B with OptiView
™
Control Center
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