28
Fig. 50 —
Drive Board
Converter Board
The converter board is the primary interface for troubleshooting as
well as SystemVu’s interface to the VFD. The purpose of the con
-
verter board is to provide an interface to the drive board while
converting the SystemVu control signal into the Modbus commu
-
nication the drive board requires. The converter board is also re
-
sponsible for providing configurations to the drive board. This is
done through the four rotary switches mounted on the board. The
required settings are listed below and printed on the unit schemat
-
ics. See Fig. 51, Table 6, and Table 7 on page 29 for more details
on the converter board.
The converter board has a four-digit display to provide feedback
for troubleshooting. It will read “IDLE” when in standby waiting
for a signal, and the software version “S##.#” will alternate with
“IDLE” during standby. It will show the actual compressor run
-
ning RPM while performing cooling. It will display an “E-##” if
an error occurs in the converter board or drive board. Use the con
-
verter board error code table (Table 9) for troubleshooting. If the
drive board is folding back the speed to protect the current the run
-
ning RPM will alternate with “Sd##” where the number indicates
the reason for fold back. See Table 8 for the foldback codes.
Table 5 —
Drive Board Inputs/Outputs
TERMINAL LABEL
DESCRIPTION
TYPE
CONNECTOR
HPS
High Pressure switch input
3.3vdc
2 Pins
SENSOR
DLT sensor input
10k thermistor
Pins 1 and 2 (inner 2 pins)
RS485
Modbus communication with the
converter board
RS485 Communication
Pins 1,4, and 5
L1, L2, L3
Supply Power from the filter board
AC high voltage
3x screw terminals
GRN
Supply Ground
Chassis Ground
2x 1/4-in. Quick Connect
DC+OUT, DC-OUT
DC bus out to capacitor board
DC high voltage
2x 1/4-in. Quick Connect
DC+IN, DC-IN
DC bus in from the capacitor board DC high voltage
2x 1/4-in. Quick Connect
U, V, W
Output to the compressor
AC High voltage
3x screw terminals
RS485
SENSOR
HPS
W
V
U
L1
L2
L3
GRN
DC- OUT
DC
+
OUT
BD
470
C JG
BD
470
C JG
BD
100
V J
G
BD
100
V J
G
BD
100
V J
G
BD
100
V J
G
BD
100
V J
G
BD
100
V J
G
BD
100
V J
G
HP
220
EJG
HP
220
EJG
DC- IN
DC
+
IN
W
arning Label
Model Label
SN Label
