York YZ MODEL A, Руководство по эксплуатации и обслуживанию

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JOHNSON CONTROLS
103
SECTION 3 - OPTIVIEW™ CONTROL CENTER FUNCTIONS AND NAVIGATION
FORM 161.01-OM1
ISSUE DATE: 6/8/2018
3
MESSAGE DESCRIPTION
MBC – NOT LEVITATED
This Safety Shutdown is set when OptiView software is commanding MBC Levitation Mode ON
but the MBC is not reporting Levitated within 15 seconds. This fault is prohibited when the MBC
Alive input is not high, indicating the MBC unavailable. This fault is released when the chiller
is stopped. The chiller can be started when the condition is released and the OptiView panel
CLEAR FAULTS key is pressed.
MBC – OVERSPEED
FAULT
This Safety Shutdown is set when the MBC determines the rotor speed exceeds the pro-
grammed setpoint for 0.1 seconds continuous. Rotor speed is transmitted to the MBC from the
VSD. 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
speed signal no longer exceeds the setpoint, which should occur when the chiller is stopped. The
chiller can be started when the condition is released and the OptiView panel CLEAR FAULTS
key is pressed.
MBC - POWER SUPPLY
FAULT
This Safety Shutdown is set when any of the MBC power supplies drops below their low limit.
This fault could be caused by a faulty MBC power supply or faulty wiring. The chiller can be
started when the condition is released and the OptiView panel CLEAR FAULTS key is pressed.
MBC - POWER FAIL
LANDING
This Safety Shutdown is set when the panel boots up after a power loss has occurred and the
buffer data prior to the shutdown showed motor speed > 0, indicating the motor was rotating
when the UPS power was lost. If the Power Fail Landing Counter on the MBC Details Screen
is < 3, the chiller can be restarted after the cause of a loss of UPS power is determined and
remedied and the OptiView panel CLEAR FAULTS key is pressed. IF the Power Fail Landing
Counter is => 3, lockout occurs and must be reset by a Service Technician.
MBC – SPEED SIGNAL
FAULT
This Safety Shutdown is set when the MBC has the speed signal cycling fault three times in a
90-minute window. The window is started when not currently in a window and a MBC Speed Sig-
nal cycling fault is received. 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 a valid speed signal over 10 Hz is presented or the MBC is not in Rotation
mode. The chiller can be started when the condition is released and the OptiView panel CLEAR
FAULTS key is pressed.
MBC – WATCHDOG
This Safety Shutdown is set when the MBC microboard program does not reset the watchdog
timer. This fault could be caused by a faulty MBC program load or a failed MBC microboard. The
chiller can be started when the condition is released and the OptiView panel CLEAR FAULTS
key is pressed.
SAFETY STOP
This is set when the panel safety stop hardware push button is depressed, removing in-put
from the I/O Board terminal TB13-28 for > 500msec. continuous. It also sets the local command
to STOP. The chiller can be started when the push button is released and the OptiView panel
CLEAR FAULTS key is pressed.
MOTOR – HIGH WIND-
ING TEMPERATURE
This safety shutdown occurs when any of the enabled motor winding temperatures exceeded the
programmed High Winding Temperature Shutdown Threshold of 270˚F (132.2˚C) for 3 continu -
ous 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 DIS-
ABLE Setpoint on the Motor Details Screen.
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 185 °F (85 °C). The
chiller can be started when the condition is released and the OptiView panel CLEAR FAULTS
key is pressed.
MOTOR – LOW
WINDING
TEMPERATURE
This Safety Shutdown is set when any enabled Motor Winding Temperature is less than 32.1°F
(0.05°C). This fault is released when the windings are greater than 32.1°F (0.05 °C).
TABLE 12 - SAFETY SHUTDOWN MESSAGES (CONT'D)