Table 91: Cycling shutdown messages
Message
Description
ISOLATION VALVES - NOT
CLOSED
The optional brine freeze protection motorized isolation valves Close output is energized
> 40 seconds, but the feedback from the valve limit switch does not indicate it closed for
three continuous seconds. This cycling fault is released when the isolation valves closed
input is energized.
LEAVING CHILLED LIQUID –
LOW TEMPERATURE
The Leaving Chilled Liquid Temperature has decreased to the programmed Shutdown
Temperature Setpoint. If the chiller is running when this occurs, a Soft Shutdown is
performed. The chiller automatically restarts when the temperature increases to the
programmed Restart Temperature Setpoint.
MBC – FAULT CONTACTS OPEN
See
MBC SHUTDOWN – REQUESTING FAULT DATA
message. If the control center’s
microboard does not receive the cause of the MBC fault over the serial link within 10
seconds after the fault contacts open is recognized, it is assumed it is not forthcoming and
that message is replaced with this message.
MBC - LOW INPUT VOLTAGE
The main DC supply voltage to the MBC decreased below 135 VDC (150-10%).
MBC – SERIAL
COMMUNICATIONS
This Cycling Shutdown is set when an invalid or no response is received from the MBC
to a Modbus command from the panel for three consecutive attempts with a 2 second
timeout between attempts. It is triggered by the Modbus communications task when its
fault conditions are met (thresholds of consecutive timeouts, ID mismatches, checksum
failures, or error packets). It is released when a valid response is received.
MBC SHUTDOWN – REQUESTING
FAULT DATA
The MBC has shutdown the chiller and the control center has not yet received the cause
of the fault from the MBC via the serial communications link. The MBC shuts down the
chiller by opening the MBC Fault contacts, which are located on the MBC control board
and connected to TB3-70 in the control center. The microboard in the control center then
sends a request for the cause of the fault to the MBC control board over the serial link.
Because serial communications are initiated every 2 seconds, this message is displayed for
a few seconds and then replaced with one of the other MBC fault messages in this section.
MBC – SPEED SIGNAL FAULT
This Cycling Shutdown is set when the MBC looses the speed signal that is expected
from the drive or speed signal is less than 10 Hz. While the MBC is commanded in
Rotation Mode, 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 is out of Rotation mode or speed greater than 10
Hz is transmitted. A 10 second bypass exists when the initial command to Rotation Mode
occurs.
MBC – STARTUP FAILURE
This Shutdown is set when the chiller fails to exit the MBC startup state within 60 seconds,
during a chiller start. Refer to the
Basic Operation
section of
YORK YVAM Service Manual
(Form 160.88-M2)
for conditions necessary to complete MBC startup successfully. Check
fault history details to determine which specific conditions were not met.
MBC – V13 LOW FREQUENCY
DISPLACEMENT
The MBC has measured shaft displacement is greater than 90 µm (90 micron) from center
in the orthogonal radial axis designated V at the impeller end radial magnetic bearing
during Levitation or Rotation mode over a 7 second window (approximately 2/3 of the air
gap space to the touchdown bearing). 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 90 µm (90 micron).
MBC - UNKNOWN PARAMETER
FILE
This Cycling shutdown is set when the bearing setup parameter file received from
OptiView is not an expected file format. The fault is released when the error is corrected.
This fault could be corrupted data transfer between OptiView and the MBC.
MBC – V13 POSITION
The MBC has measured shaft displacement is greater than 100 µm (100 micron) from
center in the orthogonal radial axis designated V at the impeller end radial magnetic
bearing during Levitation or Rotation mode (approximately 2/3 of the air gap space to the
touchdown bearing). 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).
95
YVAM Control Center
Summary of Contents for YORK YVAM 0350
Page 2: ...2 YVAM Control Center...
Page 10: ...Figure 4 Variable speed drive nomenclature YVAM Control Center 10...
Page 15: ...Figure 8 System piping and instrumentation diagram P ID 15 YVAM Control Center...
Page 154: ...Figure 62 Sample printout status or history YVAM Control Center 154...
Page 155: ...Figure 63 Sample printout status or history continued 155 YVAM Control Center...
Page 156: ...Figure 64 Sample printout setpoints YVAM Control Center 156...
Page 157: ...Figure 65 Sample printout setpoints continued 157 YVAM Control Center...
Page 158: ...Figure 66 Sample printout schedule YVAM Control Center 158...
Page 159: ...Figure 67 Sample printout sales order 159 YVAM Control Center...
Page 160: ...Figure 68 Sample printout security log report YVAM Control Center 160...