Johnson Controls YORK YVAM 0350, Руководство по эксплуатации и техническому обслуживанию

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Table 91: Cycling shutdown messages
Message Description
MBC – Z12 POSITION
The MBC has measured shaft displacement is greater than 100 µm (100 micron)
axially from the design running position (approximately 1/2 of the air gap space to the
touchdown bearing axially). 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 displacement is less than 100 µm (100 micron).
MBC - Z12 VIBRATION
The MBC has measured a vibration in axial position at 1 times the rotating frequency
whose amplitude exceeds 60 µm (60 micron). This frequency axially can be the image of
the rotor axial run-out.
This fault is available when AVR or ABS are 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 fault is released when this displacement is less than 60 µm
(60 micron).
MULTIUNIT CYCLING –
CONTACTS OPEN
The Multiunit Cycling contacts connected to I/O Board TB4-9, have opened to initiate a
cycling shutdown. If the chiller is running when this occurs, the Pre-rotation Vanes are
driven fully closed before shutting down the chiller. The chiller automatically restarts when
the contacts close.
SYSTEM CYCLING – CONTACTS
OPEN
The System Cycling contacts connected to I/O Board TB4-13, have opened to initiate a
cycling shutdown. If the chiller is running when this occurs, the Pre-rotation Vanes are
driven fully closed before shutting down the chiller. The chiller automatically restarts when
the contacts close.
UPS – LINE LOW BATTERY
VOLTAGE
This cycling fault initiates a soft shutdown if it is set while the chiller state is Running. The
fault is set during chiller state Running or Soft Shutdown when all of the following are
true:
• The Battery Voltage Faults setting is Enabled
• The Warning – UPS – Line Low Battery Voltage warning has been set for
60 continuous minutes
This fault is also set during chiller state Stopped when all of the following are true:
• The Battery Voltage Faults setting is Enabled
• The Control Voltage digital input is high (indicates line power is available)
• The Battery Voltage < Line Low Battery Voltage Threshold
The fault is released when any of the following are true:
• The Battery Voltage Faults is Disabled
• The Battery Voltage > Line Low Battery Voltage Thr 0.1 V.
VSD – DC BUS PRE-
REGULATION
The DC Bus voltage has not increased to a value of ±50 V of the DC Bus voltage setpoint of
785 VDC within 2 seconds after entering the pre-regulation state. If this condition does not
pass, then this shutdown is generated.
The variable speed drive attempts another pre-charge and pre-regulation cycle after a
delay of 10 seconds. If this shutdown occurs three consecutive times, then the chiller locks
out on a VSD – DC BUS PRE-REGULATION LOCKOUT message.
VSD – HIGH DC BUS VOLTAGE
If the DC Bus voltage exceeds the value for the given model of drive, then this shutdown
occurs.
Drive model High DC bus voltage shutdown value
0490B 878 VDC
This shutdown often occurs when there is a sudden change in the input voltage due to
storms, utility power problems, or site power problems.
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