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SECTION 33 - SYSTEM CALIBRATION, SERVICE SETPOINTS, AND RESET PROCEDURES
FORM 160.54-M1
ISSUE DATE: 10/25/2019
JOHNSON CONTROLS
JCI COMPANY CONFIDENTIAL
33
Current Unbalance Check Enable/Disable
While the chiller is running, if the compressor Motor
current in phase A, B and C becomes unbalanced, a
safety shutdown is performed. Refer to
OptiView Con-
trol Panel – Operation (Form 160.54-O1)
for com-
plete description of this check. This setpoint allows the
check to be enabled or disabled. If enabled, the check
is performed; if disabled, the check is not performed.
1. Press CURRENT UNBALANCE key.
2.
Use ◄ and ► keys to select Enable or Disable.
3. Press ENTER (
) key.
Calibration Verification
At the keypad, login at SERVICE access level using
access code 1 3 8 0.
1. Compressor Motor current display accuracy
a. Run chiller.
b. Select COMPRESSOR Screen.
c. Use the Pre-rotation Vanes HOLD keypad
key to stabilize the Compressor Motor cur-
rent.
d. Measure phase A, B and C Compressor Mo-
tor current with a clamp-on ammeter. Com-
pare the Ammeter values with displayed mo-
tor current values. If displayed values are
not 5% of Ammeter values, refer to
Solid State Starter (Mod A) – Operation and
Maintenance (Form 160.46-OM3.1)
to trou-
bleshoot the starter.
2. Start Current - Proper starting current is (45% x
Delta locked Rotor amps).
a. Select COMPRESSOR Screen.
b. Start chiller and monitor Compressor Motor
starting current in phase A, B and C on the
COMPRESSOR Screen.
Highest phase should be equivalent to (45%
x Delta Locked rotor amps).
3. Overload
a. Select COMPRESSOR Screen.
b. Run chiller and monitor Compressor Motor
current on the COMPRESSOR Screen.
c. Manually operate the Pre-rotation Vanes
by pressing the OPEN, CLOSE and HOLD
keys, as required, until the highest phase in-
dicates a current equivalent to 105% FLA.
The Display should indicate 105% and the
105% LED on the Solid State Starter Log-
ic Board should illuminate when the 105%
FLA value is reached.
Calibration
If the calibration verification does not perform as
above, one or both of the following Calibration proce-
dures will have to be performed.
At the keypad, log in at SERVICE access level using
access code 1 3 8 0.
1. Start Current
a. Select COMPRESSOR Screen.
b. Loosen locking nut on Solid State Starter
Logic Board potentiometer R38.
c. Start chiller and monitor Compressor Motor
starting current in Phase A, B and C on the
COMPRESSOR Screen.
d. While chiller is starting, adjust START CUR-
RENT potentiometer (R38) on Solid State
Starter Logic Board to achieve the proper
starting current of (0.45 x Delta Locked ro-
tor Amps) on the highest phase. Turning R38
Clockwise increases current; Counterclock-
wise decreases current. Multiple starts could
be required to achieve the correct calibration.
Tighten locking nut.
2. Overload
a. Select COMPRESSOR Screen.
b. Run Chiller and monitor Compressor Motor
current on the COMPRESSOR Screen.
c. Manually operate the Pre-rotation Vanes by
pressing the OPEN, CLOSE and HOLD key-
pad keys, as required, until the highest phase
indicates a current equivalent to 105% FLA.
Adjust OVERLOAD potentiometer (R44)
on Solid State Starter Logic Board until the
105% FLA LED illuminates. Clockwise in-
creases signal level; Counterclockwise de-
creases signal level. Tighten locking nut.