JOHNSON CONTROLS
254
FORM 201.23-NM2
ISSUE DATE: 09/25/2020
SECTION 8 - MICROPANEL
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
DC BUS VOLTAGES BUS 1 = XXX VDC
BUS 2 = XXX VDC
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
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).
Precharge Signal Status and VSD Cooling
Status
VSD PRECHARGE SIGNAL = XXX
VSD PRECHARGE 1 SIGNAL = XXX
PRECHARGE 2 SIGNAL = XXX
This display provides the state of the precharge sig-
nal, 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
VSD COMP 1 MOTOR OVERLOAD = XXX AMPS
COMP 2 MOTOR OVERLOAD = XXX AMPS
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
COMP 3 MOTOR OVERLOAD = XXX AMPS
COMP 4 MOTOR OVERLOAD = XXX AMPS
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.
System # 1 Measured Temperatures
SYS 1 TEMPERATURES OIL = XXX.X °F
SUCTION = XXX.X DISCHARGE = XXX.X °F
This message displays all of the measured system tem-
peratures (oil, suction, and discharge) at the time of the
fault.
System #1 Measured Suction Temperature
and Calculated SAT Suction Temperature and
Superheat
SYS 1 SUCTION TEMP = XXX.X °F
SUPERHEAT = XXX.X SAT REMP = XXX.X °F
This message displays all of the calculated suction
temperatures (saturated suction and system superheat)
at the time of the fault as well as measured suction tem-
perature.
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