32
Troubleshooting
Initial operation
Problem
Cause
What to do
No display
external fuse blown
replace fuse
internal fuse blown
internal fuse is not user serviceable
unit defective
contact manufacturer for service
weak or dark display
contrast bad
set contrast
no current reading
current transformer
check wiring
not connected or
shorted
current reading
CT ratio not set
check CT ratio setting
not correct
wrong line used
check wiring
Voltage reading
VT ratio not set
check VT ratio setting
not correct
wrong line used
check wiring
Phase angle reading
neutral not connected
check wiring
not correct
wrong line used
current/voltage line
mismatch
Date/time not set
Date/time has been
Set date/time (use
reset by firmware
NTP server or PAS 510)
update
Internal battery weak
contact factory for
battery replacement
Active power reading
Bad VT/CT setting
check VT/CT setting
not correct
current/voltage line
check wiring
mismatch
#### A reading
Current range overload
Check CT ratio
setting, use other CT
#### V reading
Voltage range overload
Check VT ratio setting,
use other VT
#### at flicker
Wait Pst (10min), Plt
reading
(2h) interval
No signal at digital
No output source
Check output setting
or pulse output
selected
Everything checked,
unit defective
contact factory for service
still erroneous operation
