Owner manual

26
Troubleshooting
Warning
Only qualified electricians should carry out all electrical installation and maintenance work on
the MotorGuard.
Disconnect all sources of power to the VFD and MotorGuard be
fore working on the equipment.
Do not attempt any work on a powered MotorGuard.
Monitor Board (for units with boards)
Figure 5 shows the component layout of the monitor board. The monitor board contains the fault alarm
relay and the status lights which are described below.
Figure 5 – Monitor Board Component Layout
Fault Alarm Relay
The fault alarm relay is energized when control power is applied to the MotorGuard and the output
waveform dv/dt and peak voltage are within specified limits. If the dv/dt or peak voltage limits are
exceeded, the fault relay is de-energized. A set of form C contacts are provided for customer use.
The fault relay contact may be connected to the VFD external fault input or other supervisory control
or alarm annunciation equipment. A MotorGuard fault alarm indicates that the MotorGuard is not
providing adequate dv/dt and peak voltage protection. If the drive operation continues during a fault
condition, the motor or other equipment may be damaged.
J1 J2
J3 J4 J5
J6
(T1)
J7
(T2)
J8
(T3)
1 2 3 4
O
N
D1
S1
D9
Fault
Relay
K1
120 VAC
Motor Voltage
(480/600 VAC)
Fault LED
(yellow)
Control
Power
LED
(red)
Configuration
Switch
1 2 3
4
O
N
4 3
2 1
ON