York YK-EP B Operation & Maintenance Manual page 168

SECTION 3 - DISPLAY MESSAGES
An LED on the respective device illuminates to iden-
tify the specific fault that has occurred. Refer to Solid
State Starter (Mod "A") – Operation and Maintenance
(Form 160.46-OM3.1) for details of Solid State Starter
initiated shutdowns and OptiView Control Center –
Service Instructions (Form 160.54-M1) for CM-2 initi-
ated shutdowns. The chiller will automatically restart
when the contacts close.
DEVICE
CM-2 Module
Solid State Starter
Control Panel – Schedule
The programmed Daily Schedule Setpoint has shut-
down the chiller. If this occurs while the chiller is run-
ning, the Pre-Rotation Vanes are driven fully closed
prior to shutting down the chiller. The chiller will auto-
matically restart at the next scheduled start time.
Starter – Low Supply Line Voltage (Mod "A"
Solid State Starter)
The voltage in any phase of the AC Power Line Voltage
supplying the Solid State Starter has decreased to the low
line voltage threshold for 20 continuous seconds. The
chiller will automatically restart when the voltage returns
to the restart level. The thresholds are as follows:
SUPPLY VOLTAGE RANGE
(VOLTS)
380
400
415
440-480
550-600
Supply Voltage Range disabled
Starter – High Supply Line Voltage (Mod "A"
Solid State Starter)
The voltage in any phase of the AC Power Line Voltage
supplying the Solid State Starter has increased to the
high line voltage threshold for 20 continuous seconds.
The chiller will automatically restart when the voltage
returns to the restart level. The thresholds are as fol-
lows:
168
SHUTDOWN
Power Fault
Power Fault
Half Phase
SHUTDOWN RESTART
(VOLTS) (VOLTS)
305 331
320 349
335 362
370 400
460 502
None N/A
SUPPLY VOLTAGE RANGE
(VOLTS)
380
400
415
440-480
550-600
Supply Voltage Range disabled
Proximity Probe – Low Supply Voltage
This message indicates the +24VDC power sup-
ply voltage to the Proximity Probe has decreased to
+19.0VDC. This is below the minimum level required
for reliable operation. The chiller will automatically re-
start when the voltage increases to greater than or equal
to 19.7VDC.
Oil – Variable Speed Pump – Drive Contacts
Open
The Oil Pump Variable Speed Drive has shut down
the chiller by opening its status contacts connected to
the I/O Board TB3-70. The Drive initiates a shutdown
anytime its internal protection circuits will not permit
the Drive to run. The contacts remain open until its
internal protection circuits are satisfied it is safe to
operate. Some Drive initiated shutdowns require AC
Power to be cycled to clear the fault. The chiller will
automatically restart when the contacts close.
MOD "B" SOLID STATE STARTER CYCLING
SHUTDOWN MESSAGES
LCSSS Initialization Failed
When AC Power is restored to the system after a pow-
er failure, an initialization process occurs wherein the
Control Center attempts to establish communications
through the serial communications link with the Liquid
Cooled Solid State Starter. If communications are not
established within 10 consecutive attempts, a cycling
shutdown is performed and this message is displayed.
The Control Center attempts to establish communica-
tions until successful.
LCSSS – Serial Communications
After communications have been successfully estab-
lished in the Initialization process, the Control Center
initiates a data transmission to the Liquid Cooled Solid
State Starter on the serial communications link every 2
seconds. After these communications have been estab-
FORM 160.87-OM1
ISSUE DATE: 8/24/2018
SHUTDOWN RESTART
(VOLTS) (VOLTS)
415 414
436 435
454 453
524 523
655 654
None N/A
JOHNSON CONTROLS