York YK M3 M3 G4 THRU YK S6 S4 J2, YK LB LB G4 THRU YK SE SC J4 Function, Jumper Position

chiller, press COMPRESSOR switch to STOP/RESET position and then to START position.

VANE MOTOR SWITCH OPEN

The chiller is shut down because a system-start se- quence has been initiated, but the pre-rotation vanes are not fully closed.

MON XX:XX AM – STARTER MALFUNCTION DETECTED

The chiller is shut down because the Control Center has detected a motor-current value greater than 15% FLA for 10 seconds minimum anytime when the com- pressor-start signal is not energized. To restart the chiller, press COMPRESSOR switch to STOP/RESET position and then to the START position.

MON XX:XX AM – PROGRAM INITIATED RESET

The chiller is shut down because Micro Board did not receive a hardware-generated interrupt on schedule. Typical is an Analog/Digital Converter interrupt. This message is indicative of a Micro Board hardware fail- ure or electrical noise on Micro Board. The chiller will automatically restart. This message indicates that the watchdog timer-circuit has reset the microprocessor. This occurs when the time needed to step through pro- gram is longer than allowable, thus the software pro- gram is initialized at its beginning.

SYSTEM READY TO START – PRESS STATUS

The chiller was shut down on a safety shutdown and will start upon application of a local or remote start signal. Since the message states that the chiller is “Ready to Start”, it means that the shutdown no longer exists and the Control Center has been manually re- set. When the STATUS key is pressed, a message is displayed that describes the reason for shutdown. The message will be displayed for 2 seconds and then re- turn to SYSTEM READY TO START – PRESS STATUS .

Those messages that could be displayed are any of the previously described safety-shutdown messages or warning messages. They can be cleared from the display by entering Service mode and pressing WARN- ING RESET key. Or, the message will be cleared by initiating a compressor start.

START SEQUENCE INITIATED

Indicates that the Micro Board has received a local or remote start signal and has initiated the chiller start- up routine.

This is the compressor pre-lube period. The duration of this period is controlled by the “Prerun” (JP6) wire

FORM 160.49-O2

jumper on the Micro Board as follows:

FUNCTION	JUMPER POSITION
50 Sec. Oil Pump Prerun	Installed
180 Sec. Oil Pump Prerun	Cut

SYSTEM COASTDOWN

Displayed while motor is decelerating after a chiller shutdown. The oil pump is running during this period. The duration of this period is 150 seconds.

If unit is configured for a Steam Turbine application (program jumper JP4 removed), this period is extended to allow for a longer coastdown time. EPROM version C.02F(T).11 provides a 6 minute coastdown period. EPROM version C.02F(T).12 or later provides a 10 minute coastdown period.

MON XX:XX AM – MTR PHASE CURRENT UNBALANCE

(Solid State Starter applications only)

The chiller is shut down because the compressor-motor current was unbalanced while the chiller was running. The current balance is only checked after the motor has been running for a minimum of 45 seconds and the motor current is 80% FLA or greater. If the current in

any phase deviates from the average (a + b + c ) current

3

by greater than 30% for a minimum of 45 consecutive seconds, a shutdown is initiated. To restart the sys- tem, press the COMPRESSOR switch to STOP/RE- SET position and then to the START position. An ex- ample of the conditions for shutdown is as follows:

IF:

I∅A = 200A

I∅B = 200A

I∅C = 118A

THEN:

IAV = 200 + 200 + 118 3

IAV = 173A

IACCEPTABLE = 173 ± 30% = 121A or 225A

THEREFORE:

Since I∅C = 118A which is less than the accept- able 121A, the chiller would shut down if this unbalance exists for 45 consecutive seconds.

MON XX:XX AM – LOW LINE VOLTAGE

(Solid State Starter applications only)

Chiller is shut down because the voltage in any phase of line voltage has decreased below the under-volt- age-shutdown threshold for 20 consecutive seconds,

YORK INTERNATIONAL 27