JOHNSON CONTROLS
249
SECTION 8 - MICROPANEL
FORM 201.23-NM2
ISSUE DATE: 09/25/2020
8
The next key press displays the current limit values
set locally on the panel under the PROGRAM key, re-
motely by an ISN, and remotely by the Current Limit
input. Any current limits that are inactive will display
“XXX” instead of a numeric value.
VSD CURRENT LIMIT LOCAL = XXX %FLA
ISN = XXX REMOTE = XXX %FLA
The next key press displays DC Bus voltage for 2 and 3
compressor units. On 4 compressor units, the 2nd mes-
sage will apply, since two DC Bus voltages are present
(Systems 1/3 and 2/4).
VSD DC BUS VOLTAGE = XXX VDC
VSD DC BUS VOLTAGES BUS 1 = XXX VDC
BUS 2 = XXX VDC
The next key press displays the Control Panel/VSD In-
ternal Ambient Temperature and VSD Cooling Pump/
Fan Status. YYY will indicate ON or OFF.
VSD INTERNAL AMBIENT TEMP = XXX.X °F
COOLING SYSTEM STATUS = YYY
The next key press displays the IGBT highest baseplate
temperature for 2 and 3 compressor units. 4 compres-
sor units display temperatures for Systems 1/3 (T1)
and Systems 2/4 (T2).
VSD IGBT BASEPLATE TEMPS T1 = XXX °F
T2 = XXX °F
The next key press displays the state of the Precharge
signal, where XXX is either ON or OFF. The first dis-
play is for 2 and 3 compressor units, the second display
shown is for 4 compressor units where Precharge 1 is
for compressors 1 and 3 DC Bus and Precharge 2 is for
compressors 2 and 4 DC Bus.
VSD PRECHARGE SIGNAL = XXX
VSD PRECHARGE 1 SIGNAL = XXX
VSD PRECHARGE 2 SIGNAL = XXX
The next key press displays the setting of the VSD’s
105% FLA overload potentiometer for Compressor
#1 and 2. The settings are determined by the adjust-
ment of the overload potentiometers on the VSD Logic
Board. These pots are factory set and should not re-
quire changing unless the circuit board is replaced. See
Table 39 on page 315 for factory settings.
VSD COMP 1 MOTOR OVERLOAD = XXX AMPS
COMP 2 MOTOR OVERLOAD = XXX AMPS
The next key press displays the setting of the VSD’s
105% FLA potentiometer for Compressor #3 and #4 (3
and 4 compressor units only). The second line will be
blanked out on 3 compressor units.
VSD COMP 3 MOTOR OVERLOAD = XXX AMPS
COMP 4 MOTOR OVERLOAD = XXX AMPS
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