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System Calibration
achieve a motor current equivalent to 105% FLA
as indicated by the clamp-on Ammeter. The 105%
LED on the CM-2 Module should il lu mi nate.
If the calibration verification does not perform as
above, the following Calibration procedure will have
to be per formed:
Calibration:
1. At the Keypad, log in at SERVICE access level
us ing access code 1 3 8 0 .
2. Select MOTOR Screen and set Current Lim it and
Pulldown Demand Limit Setpoints to 100% FLA.
3. Select COMPRESSOR Screen.
4. Run chiller and read compressor motor cur rent in
Phase A, B and C using a clamp-on Ammeter. Ap-
ply Ammeter to highest Phase.
5. Manually operate the Pre-rotation Vanes by press ing
the OPEN and CLOSE Keypad keys as re quired
to achieve a motor current equivalent to 100% FLA
as indicated by the clamp-on Am me ter. The voltage
across Variable Re sis tors (RES) should be 0.90 to
1.05VDC. Measure this volt age by connecting a
Voltmeter at CM-2 Board J1-2 (+) to J1-1(-). If
necessary, adjust RES to achieve this value. Figure
38 contains for mu las to cal cu late the resistance of
RES required to achieve this volt age. Adjust both
re sis tors equally such that the com bined resistance
equals the cal cu lat ed val ue.
6. Manually operate the Pre-rotation Vanes by press-
ing the OPEN, CLOSE and HOLD Keypad keys,
as required, to achieve a motor current equiv a lent to
105% FLA as indicated by the clamp-on Am me ter.
Loosen locking nut on Po ten ti om e ter R8 on CM-2 and
adjust until the CM-2 Module 105% LED il lu mi nates.
Coun ter clock wise increases sig nal lev el; Clock wise
decreases signal level. Tight en locking nut.
6. Manually operate the Pre-rotation Vanes by
press ing the OPEN and CLOSE Keypad keys, as
re quired, to achieve a motor current equivalent to
100% FLA as indicated by the clamp-on Am me ter.
Loose locking nut on Potentiometer R34 on CM-
2 and adjust until the motor current value on the
Display indicates 100% FLA. Clockwise in creas es
the signal level; Counterclockwise de creas es the
signal level. Tight en locking nut.
134
SOLID STATE STARTER AP PLI CA TIONS
The chiller could be equipped with either of two dif fer ent
YORK Solid State Starters. Later production chill ers are
equipped with the Mod "B" se ri al data in ter face Liquid
Cooled Solid State Starter (LCSSS). Earlier vin tage chill-
ers are equipped with the Style "A" mul ti plexed data inter-
face LCSSS. Microboard Program Jumper JP39 must be
positioned to invoke the ap pro pri ate Microboard/Program
operation for the start er ap plied (Re fer to Table 1). A
description of these start ers is con tained in the Sol id State
Starter section of this book. The pro ce dures for both start-
ers are listed be low.
MOD "B" SERIAL DATA INTERFACE LIQ UID COOLED
SOLID STATE STARTER
Complete details of the operation of this starter are con-
tained in YORK Service Manual 160.00-O2.
1. At the Keypad, log in at SERVICE Access lev el
us ing Password 1 3 8 0 .
2. Select MOTOR Screen.
3. Enter the following setpoints using the pro ce dures
below:
Full Load Amps:
This is the Full Load Amps (FLA) of the chiller as list ed
on the Sales Order Screen. The Microboard uses the pro-
grammed value to perform Current Limit func tions and
display compressor motor current in terms of %FLA.
1. Press FULL LOAD AMPS key.
2. Use numeric keypad keys to enter correct value.
3. Press ENTER (✔) key.
Start Current:
The Logic/Trigger Board will limit compressor motor
current to this value during starting. The correct value
is (0.45 x Delta Locked Rotor amps), as listed on the
SALES ORDER Screen.
1. Press STARTING CURRENT key.
2. Use numeric keypad keys to enter correct value.
3. Press ENTER (✔) key.
FORM 160.54-M1(503)
YORK INTERNATIONAL
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