Revision 1.1
Variphase User Manual
Page 13
Troubleshooting
LED Indicators
The NET Led shows all network activity (RS485 mode) or receive data activity (RS422 mode).
With no bus activity this Led should be OFF.
If the NET Led is on-continuously, it is likely that the network connections are transposed (i.e.
signals in the RS485 differential pair are swapped).
The STAT Led flashes steadily when the motor is stopped. When the motor is running, the STAT
Led is on steadily. In addition, anytime the control responds to a Modbus message the Led
flickers briefly.
Diagnosing Other Faults
Most Variphase models have an internal fuse. Excessive load current will cause the fuse to fault
and the unit will be non-functional and non-responsive to network communications. The fuse is
NOT field replaceable.
If the motor does not start or run smoothly, check power wiring to the motor. This is especially
important in 3-wire operation, where the auxilliary winding is driven independently.
Electrical Wiring and Specifications
Control Terminal Connections
1
2
3
4
5
6
7
+5V
Out
Hall
Sensor
Signal
0V
(GND)
+12V
Out
Analog
Input 2
0V
(GND)
Analog
Input 1
Table 3
Mating Part for Control Connector : Phoenix 5.08mm Terminal Block Plug #1757064
Power Connections
ML
AL
L
MN
N
AC Line to
Motor
AC Line to
Motor Aux
AC Line Input
Neutral to
Motor
AC Neutral Input
Table 4
