MNL940-677-000
REV - B
3/20/2017
14
4.2
TROUBLESHOOTING
In the event problems are encountered during the installation and operation of the inverter refer to
the chart below before assuming the inverter is at fault. If it is determined the fault is with the
inverter, contact Behlman Electronics for service information.
SYMPTOM
POSSIBLE CAUSE
ACTION
Low or no output
DC IN LED is green
INV LED is red
Output overloaded
Check load current. Disconnect
load and recheck output voltage
using TRMS meter. Recycle
power.
Erratic operation
Input voltage fluctuating
Monitor voltage at DC input
terminals of inverter. Make
sure it is with in specifications
No AC out in bypass mode
(optional)
AC - Bypass fuse blown
Check fuse. Measure AC input at
rear panel.
Output distorted
High peak load current
Reduce loading if distortion is
objectionable.
DC breaker repeatedly trips
DC polarity reversed or internal
fault in inverter.
Check polarity, if ok, the unit
may have an internal fault.
Return for service
WARNING
Service of this device requires specialized equipment and trained personnel. There are no
internal user serviceable parts. Removing the cover will expose individuals to hazardous
voltages.
Refer service to qualified persons only!
4.3
MAINTENANCE
The INV-1200 series requires very little in the way of routine maintenance. If the unit is operated
in a dirty or dusty environment it should be removed from service periodically and cleaned. The
use of forced air is perfect for cleaning dust and debris from fan intakes and heat sink
assemblies. Light brushing and vacuuming is also effective.
If the unit is to be supplied from batteries, the condition of the batteries will have a significant
effect on the operation of the unit. Poorly maintained batteries can cause the unit malfunction
when heavily loaded. If this device is to be used as part of a back-up power system a battery
maintenance schedule should be discussed with the battery manufacturer. Behlman does not
provide batteries for these units.
