Table 92: Safety shutdown messages
Message Description
MBC – SPV
UNAUTHORIZED
ROTATION
This Safety Shutdown is set when the MBC is commanded to Rotation mode
while it is not indicating acceptable to rotate. The MBC Fault contacts open.
The MBC remains in Levitation mode with the motor shaft levitated until
commanded to de-levitate over serial comms. This shutdown is the rotation
mode command is coincident with MBC levitated and rotation allowed contacts
closed. The chiller can be started when the condition is released and the
OptiView
™
panel CLEAR FAULTS key is pressed.
MBC – DSP
UNAUTHORIZED
ROTATION
This Safety Shutdown is set when the MBC detects a rotor speed signal from
the VSD while the Levitation Mode is not activated. The MBC Fault contacts
open. The MBC remains in Levitation mode with the motor shaft levitated
until commanded to de-levitate over serial comms. This shutdown is released
when the MBC Levitation or Rotation mode is activated or the VSD speed signal
indicates no shaft rotation. The chiller can be started when the condition is
released and the OptiView panel CLEAR FAULTS key is pressed.
MOTOR –
HIGH WINDING
TEMPERATURE
This safety shutdown occurs when any of the enabled motor winding
temperatures exceeded the programmed High Winding Temperature Shutdown
Threshold of 302˚F (150˚C) for 3 continuous seconds.
The chiller can be started after all winding temperatures decreased to at least
18˚F (10˚C) below the shutdown threshold and the COMPRESSOR is stopped.
The safety shutdown will not act on any individual winding temperature sensor
that has been disabled with the TEMPERATURE DISABLE Setpoint on the Motor
Details Screen.
MOTOR –
HIGH ROTOR
TEMPERATURE
This safety shutdown occurs when the estimated rotor temperature exceeds
250.0˚F for 3 continuous seconds. The fault is released and the chiller can
be restarted when the estimated rotor temperature is below 230˚F and the
OptiView panel CLEAR FAULTS key is pressed.
MOTOR –
HIGH HOUSING
TEMPERATURE
This Safety Shutdown is set when Motor Housing Temperature is greater than or
equal to 185°F (85°C). This fault is released when Motor Housing Temperature is
less than 158°F (70°C). The chiller can be started when the condition is released
and the OptiView
™
panel CLEAR FAULTS key is pressed.
YMC
2
Mod B with OptiView
™
Control Center
132
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