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JOHNSON CONTROLS
FORM 201.21-NM1 (1223)
These messages indicate the compressor %FLA and
currents for systems 3 and 4 at the time of the fault.
For 3 compressor units, the #4 compressor information
is blanked out.
VSD Current Limit
HISTORY KEY (CON'T)
COMP 1 = XXX AMPS = XXX %FLA
COMP 3 = XXX AMPS = XXX %FLA
COMP 2 = XXX AMPS = XXX %FLA
COMP 4 = XXX AMPS = 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 CURRENT LIMIT LOCAL = XXX %FLA
ISN = XXX REMOTE = XXX %FLA
VSD DC BUS VOLTAGE = XXX VDC
VSD PRECHARGE SIGNAL = XXX
VSD PRECHARGE 1 SIGNAL = XXX
PRECHARGE 2 SIGNAL = XXX
This message displays the DC bus voltage at the time
of the fault. On 4 compressor units, the 2nd message
will apply since two DC bus voltages are present (1/3
and 2/4) at the time of the fault.
VSD Internal Ambient Temp
DC BUS VOLTAGES BUS 1 = XXX VDC
BUS 2 = XXX VDC
This message displays the VSD/Micro internal ambient
cabinet temperature and the cooling system status (ON
or OFF) at the time of the fault.
IGBT Baseplate Temperature
VSD INTERNAL AMBIENT TEMP = XXX.X °F
COOLING SYSTEM STATUS = YYY
VSD COMP 1 MOTOR OVERLOAD = XXX AMPS
COMP 2 MOTOR OVERLOAD = XXX AMPS
VSD IGBT BASEPLATE TEMPS T1 = XXX °F
T2 = XXX °F
This message displays the IGBT highest baseplate tem-
perature 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).
Precharge Signal Status and VSD Cooling
Status
COMP 3 MOTOR OVERLOAD = XXX AMPS
COMP 4 MOTOR OVERLOAD = XXX AMPS
This display provides the state of the precharge signal,
where Precharge 1 and Precharge 2 is either ON or OFF
at the time of the fault. Precharge 2 is only used on 4
compressor units.
Compressor #1 and #2, 105% FLA Motor Overload
Current Setting
This message displays the setting of the VSD’s 100%
FLA potentiometer for Compressor #1 and #2 at the
time of the fault.
Compressor #3 and #4, 105% FLA Current
Setting
This message displays the setting of the
VSD’s 100% FLA potentiometer for Compressor #3 and
#4 at the time of the fault.
SYSTEM DATA
System #1 Pressures
SYS 1 PRESSURES OIL = XXXX PSIG
SUCTION = XXXX DISCHARGE = XXXX PSIG
This message displays all of the measured system pres-
sures (oil, suction, and discharge) at the time of the
fault.
MICRO PANEL
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