Megger INGVAR, User Manual

Page: 54 / 72

54 ZP-BH05E BH0654BE
9 TROUBLESHOOTING
9
T
roubleshooting
General
Problem Possible cause Remedy
No current is sent
out from INGVAR Check miniature circuit
breaker F1.
Overheating may have trig-
gered the thermal protection.
The thermal protection resets itself automatically after INGVAR cools
down.
Interupted circuit Check the connections to the object being tested. If a breaker is being
tested, check to see that it is closed.
Check the connection between Control Unit and Current Unit.
Not possible to
switch on INGVAR.
The display is dark The fuse F2 / F3 has blown Check the fuses.
No mains Check that the mains cable is plugged in properly and that mains volt-
age is present.
Generation stops
immediately or after
half a cycle Stop condition is set to INT
and F1 is off Close F1
Stop condition is set to INT
and the output circuit is open. Change stop condition or close output circuit.
Stop condition is set to INT and the output current is just a few per-
centage of the measurement range of ammeter 1, see 11.8.
Increase the current, decrease INT-level or use range or output with
lower current rating.
Note
: Connecting Current Unit in series will decrease the measure-
ment ranges.
Generation does
not stop when the
breaker opens Zero offset need to be
calibrated, see section 10.2
”Calibration of offset”
Unexpected value
on Ammeter 1
INGVAR is set for DC-Meas-
urement while AC is gener-
ated or vice versa. (Fault will
be approx. 10%) Select proper setting for DC-Measurement (submenu system)
The test object has higher
impedance than expected Increase the voltage applied from INGVAR by connected the Current
Unit in series.
Measurement errors
Problem Possible cause Remedy
No reading on voltmeter
and ammeter 2 The instrument is not activated Activate the instrument in the
"V/A-METER" menu option if its
indicator lamp is not lit.
Time ” 0.000s ” is displayed
but generation continues
The stop condition is met but AUTO is not activated
Press
RESET
if you want the gen-
eration time displayed
”
——- A or ——-V
” is
displayed
The measurement time was too short, the HOLD func-
tion cannot present any frozen readings or there was not
enough time for a range to be selected automatically. Increase the measurement time
or select a fixed range
”
——- OFA or OFV
" is
displayed
The magnitudes of the input signals are too great for the
fixed preset range or the "AUTO" range does not have
time to function properly for high-speed cycles. (”OF” =
Overflow) Carry out a new measurement or
select a fixed range
” AMP2=0A AMP1=0A ”is
displayed
Because the measurement current is 0, no ratio can be
calculated. Generate current