SECTION 8 - MICROPANEL
JOHNSON CONTROLS
139
Form 201.28-NM1.1
Issue date: 08/06/2021
8
VSD data key
LD10605
VSD
data key
General
The VSD DATA key provides the user with displays of
VSD temperatures, voltages, currents, and other oper-
ating data. This key has multiple displays, which can
be seen by repeatedly pressing the VSD DATA or the
▲ or ▼ (Arrow) keys. An explanation of each mes
-
sage is provided.
VSD data key operation
The first VSD DATA key press displays the actual VSD
Output Frequency and Command Frequency.
VSD FREQUENCY
ACTUAL = XXX.X HZ
COMMAND = XXX.X HZ
The second key press of the VSD DATA key or the ▼
(ARROW) key displays the calculated compressor %
FLA and measured motor currents in amps for systems
1 and 2. When measuring motor current keep in mind
that measuring inverter PWM current is difficult and
meter error can be significant.
VSD COMP 1 = XXX AMPS
= XXX %FLA
COMP 2 = XXX AMPS
= XXX %FLA
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.
VSD DC BUS VOLTAGE = 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.
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.
VSD
PRECHARGE 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 adjustment of
the overload potentiometers on the VSD Logic Board.
These pots are factory set and should not require chang-
ing unless the circuit board is replaced.
VSD
COMP 1 MOTOR OVERLOAD = XXX AMPS
COMP 2 MOTOR OVERLOAD = XXX AMPS
