Table 7 - Lcsss Low Supply Line Voltage Thresholds; Table 8 - Lcsss High Supply Line Voltage Thresholds - Johnson Controls YORK OPTIVIEW CONTROL CENTER Operation Manual

SECTION 3 - OPTIVIEW DISPLAY MESSAGES
TABLE 7 - LCSSS LOW SUPPLY LINE VOLTAGE
THRESHOLDS
SUPPLY
SHUTDOWN
VOLTAGE
(VOLTS)
RANGE (VOLTS)
Disabled
200-208
220-240
380
400
415
440-480
550-600
LCSSS – High Supply Line Voltage
The liquid cooled solid state starter logic/trigger
board has detected that the compressor motor AC pow-
er line voltage, in any phase, exceeded the high line
voltage threshold continuously for twenty (20) seconds.
The chiller will automatically restart when the voltage
in all phases reaches the restart level. The thresholds are
as follows:
TABLE 8 - LCSSS HIGH SUPPLY LINE VOLTAGE
THRESHOLDS
SUPPLY
SHUTDOWN
VOLTAGE
(VOLTS)
RANGE (VOLTS)
Disabled
200-208
220-240
380
400
415
440-480
550-600
VSD CYCLING SHUTDOWN MESSAGES
The following cycling shutdown messages are dis-
played on compressor motor Variable Speed Drive
(VSD) applications only. These messages are gener-
ated by events that occur within the VSD. The chiller
will automatically restart when the cycling condition
clears. Service and troubleshooting information is con-
tained in the Variable Speed Drive – Service Manual
(Form 160.00-M1).
108
RESTART
(VOLTS)
None N/A
160 174
185 200
305 331
320 349
335 362
370 400
460 502
RESTART
(VOLTS)
None N/A
227 226
262 261
415 414
436 435
454 453
524 523
655 654
VSD Shutdown – Requesting Fault Data
This message indicates the VSD has shutdown the
chiller on fault and the OptiView Control Center has
not received the cause of the fault from the VSD, via
the serial communications link. The VSD shuts down
the chiller by opening the motor controller VSD stop
contacts (located on the VSD logic board and connect-
ed between TB6-16 and TB6-53 in the control center).
The control center microboard then sends a request for
the cause of the fault to the VSD logic board via the
Adaptive Capacity Control board (ACC), over the se-
rial communications link. Since serial communications
are initiated every two (2) seconds, this message is typ-
ically displayed for a few seconds and then replaced
with one of the following fault messages.
VSD – Stop Contacts Open
Refer to VSD SHUTDOWN – REQUESTING
FAULT DATA message above. When the OptiView
microboard does not receive the cause of the fault over
the serial link within twenty (20) seconds, the OptiV-
iew Control Center assumes the cause is not forthcom-
ing and this message is displayed.
VSD – Logic Board Power Supply
This shutdown is generated by the VSD logic board,
indicating that the low voltage power supplies for the
logic boards have dropped below their allowable op-
erating limits. The logic board is supplied with power
from the 120 to 24 VAC secondary transformer, which
is supplied with power from the 480 to 120 VAC con-
trol power transformer. This message typically indi-
cates power to the VSD has been lost.
VSD – Single Phase Input Power
This fault is generated by the SCR trigger control and
relayed to the VSD logic board to initiate a system
shutdown. The SCR trigger control uses circuitry to
detect the loss of any one of the three input phases.
The trigger will detect the loss of a phase within one
half line cycle of the phase loss. This message is also
displayed when power to the VSD is removed or if the
input power dips to an extremely low level.
VSD – Phase (X) Gate Driver
A second level of current protection exists for each
current phase A, B, or C (designated as X above), on
the VSD driver boards. The collector-to-emitter satura-
tion voltage of each Insulated Gate Bipolar Transitor
(IGBT) is checked continuously while the device is
gated on. If the voltage across the IGBT is greater than
FORM 160.10-O1
ISSUE DATE: 4/27/2018
JOHNSON CONTROLS