York YK-EP B Operation & Maintenance Manual page 170

SECTION 3 - DISPLAY MESSAGES
in all phases returns to the restart level. The thresholds
are as follows:
SUPPLY VOLTAGE 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 20 seconds. The
chiller will automatically restart when the voltage in
all phases returns to the restart level. The thresholds
are as follows:
SUPPLY VOLTAGE RANGE
(VOLTS)
Disabled
200-208
220-240
380
400
415
440-480
550-600
LCSSS – Logic Board Processor
Communication between the V25 Microprocessor and
Digital Signal Processor (DSP) on the Liquid Cooled
Solid State Starter Logic/Trigger Board has been in-
terrupted. The chiller will automatically restart when
communications are restored.
LCSSS – Logic Board Power Supply
Following application of power, this message is dis-
played and a snapshot of the LCSSS parameters and
time of power failure are sent to the Control Center.
LCSSS – Phase Rotation/Loss
The Liquid Cooled Solid Starter Logic/Trigger Board
has detected the three-phase compressor motor power
line voltage phase rotation is not correct or the line-
to-line voltage in any phase has decreased to less than
170
SHUTDOWN RESTART
(VOLTS) (VOLTS)
None N/A
160 174
185 200
305 331
320 349
335 362
370 400
460 502
SHUTDOWN RESTART
(VOLTS) (VOLTS)
None N/A
227 226
262 261
415 414
436 435
454 453
524 523
655 654
30% of nominal. The chiller will automatically restart
when the power line conditions are acceptable.
LCSSS – Phase Loss
The Liquid Cooled Solid State Starter Logic/Trigger
Board has detected the line-to-line RMS voltage in any
phase has decreased to less than or equal to 30% of the
lowest value of the programed voltage range. If the pro-
grammed voltage range is Disabled, a value of 60VAC
is used as the threshold. The chiller will automatically
restart when the line voltage is greater than the shut-
down threshold. The voltage range is programmed by a
Service Technician following instructions in OptiView
Control Center – Service Instructions (Form 160.54-
M1).
COMPRESSOR MOTOR VARIABLE SPEED
DRIVE: 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 Variable Speed Drive – Service Instructions
(Form 160.00-M1).
VSD Shutdown – Requesting Fault Data
The VSD has shutdown the chiller and the Control
Center has not yet 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 connected between TB6-16 and TB6-53 in
the Control Center). The Microboard in the Control
Center then sends a request for the cause of the fault to
the VSD Logic Board via the Adaptive Capacity Con-
trol Board, over the serial link. Since serial communi-
cations are initiated every 2 seconds, this message is
typically displayed for a few seconds and then replaced
with one of the below listed fault messages.
VSD – Stop Contacts Open
Refer to VSD Shutdown – Requesting Fault Data on
Page 170. If the Control Center's Microboard does
not receive the cause of the fault over the Serial Link
within 20 seconds, it is assumed it is not forthcoming
and that message is replaced with VSD – STOP CON-
TACTS OPEN message.
FORM 160.87-OM1
ISSUE DATE: 8/24/2018
JOHNSON CONTROLS