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JOHNSON CONTROLS
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SECTION 8 - MICROPANEL
FORM 201.28-NM1.1
ISSUE DATE: 1/31/2018
Load / Unload Timers
UNIT LOAD TIMER = XXX SEC
UNLOAD TIMER = XXX SEC
This message indicates remaining time on the load and
unload timers at the time of the fault.
Chilled Liquid Temperature Error and Rate of
Change
UNIT TEMP ERROR = XXX.X °F
RATE = XXX.X °F/M
This message indicates the temperature error between
the actual and the programmed setpoint at the time of
the fault and the rate of temperature change.
Programmed Lead System Selection and
Flow Switch Status
UNIT LEAD SYSTEM NUMBER = X
FLOW SWITCH = XXX
This message indicates the designated lead system at
the time of the fault and whether the flow switch was
ON (Closed) or OFF (Open) at the time of the fault.
Evaporator Pump and Evaporator Heater
Status
UNIT EVAP PUMP RUN = XXX
EVAP HEATER = XXX
This message indicates the status of the evaporator
pump and the evaporator heater at the time of the fault.
XXX indicates ON or OFF.
Active Remote Control Status
UNIT ACTIVE REMOTE CONTROL = XXXXXX
This message indicates whether the system was operat-
ing under Active Remote Control (RCC, ISN, LOAD,
TEMP, or SOUND) or standard control (NONE) at the
time of the fault.
UNIT SOUND LIMIT LOCAL = XXX %
ISN = XXX REMOTE = XXX %
This message indicates that sound limiting was in ef-
fect, the amount, and whether it was local or remotely
limited.
VSD Data
VSD Actual and Command Frequency
VSD FREQUENCY ACTUAL = XXX.X HZ
COMMAND = XXX.X HZ
This message indicates the VSD actual operating fre-
quency and the command frequency at the time of the
fault. Actual and command may not match due to load/
unload timers, limitation of 1 Hz per load/unload incre-
ment, and to allowable acceleration/deceleration of the
motor.
Compressor Amps and %FLA
The message indicates the compressor %FLA and mo-
tor currents for systems 1 and 2 at the time of the fault.
COMP 1 = XXX AMPS = XXX %FLA
COMP 2 = XXX AMPS = XXX %FLA
VSD Current Limit
VSD CURRENT LIMIT LOCAL = XXX %FLA
ISN = XXX
REMOTE = XXX %FLA
This message displays the current limit values as set
locally, by an ISN, or a remote current limiting input at
the time of the fault.
DC BUS Voltage
VSD DC BUS VOLTAGE = XXX VDC
This message displays the DC Bus voltage at the time
of the fault.
VSD Internal Ambient Temp
VSD INTERNAL AMBIENT TEMP = XXX.X °F
COOLING SYSTEM STATUS = YYY
This message displays the VSD/Microprocessor inter-
nal ambient cabinet temperature and the cooling sys-
tem status (ON or OFF) at the time of the fault.
IGBT Baseplate Temperature
VSD IGBT BASEPLATE TEMPS T1 = XXX °F
T2 = XXX °F
This message displays the IGBT highest baseplate
temperature for 2 and 3 compressor units at the time of
the fault. 4 compressor units display temperatures for
1/3 (T1) and 2/4 (T2).