Ladis G31 10K, Service Manual

Page: 21 / 62

21
–BUS voltage keeps
higher than -300Vfor more
than 200ms, the fault
signal will be displayed.
and SCR for the PFC and the utility power
SCR are well. Meanwhile, check if
components on the drive circuit are well.
04 None
BUS voltage
unbalance
When the difference
between the ±Bus voltage
absolute value keeps more
than 100 for 200ms, the
fault signal will be sent.
Maybe the PFC board is damaged.
Check if power components such as IGBT
and SCR for the PFC and the utility power
SCR are well. Meanwhile, check if
components on the drive circuit are well.
06 None
Converter over
current
.When the current of
PFC/Boost is over 30
A(20K:60A), the fault
signal will be display
Maybe the PFC board is damaged.
Check if power components such as IGBT
and SCR for the PFC and the utility power
SCR are well. Meanwhile, check if
components on the drive circuit are well.
11 None
INV soft start
failure
Inverter voltage can
’t
reach the setting value in
40s.
Check the inverter drive circuit.
12 None
INV voltage high
When INV voltage keeps
higher than 276V for 400
ms, the fault signal will be
displayed.
Check if power components in power INV
and on the drive circuit are normal. Check if
IGBT protective circuit and some PFC
components are normal.
13 None
INV voltage low
When INV voltage keeps
lower than 140V for 400
ms, the fault signal will be
displayed.
Maybe the INV board is damaged;
Check if power components in power INV
and on the drive circuit are normal. Check if
IGBT protective circuit and some PFC
components are normal.
14
Inverter
1
(Line to
Neutral)Output
short circuit
When INV
1
output voltage
keeps lower than 50V and
output
current keeps
higher than 30A(for 10K is
20A)for over 4 periods, the
fault
signal will be
displayed.
Remove all the loads. Turn off the UPS.
Check whether the output of UPS and loads
are short circuited. Make sure the short
circuit is removed, and the UPS has no
internal faults before turning on again.
15
Inverter
2
(Line to
Neutral)Output
short circuit
When INV
2
output voltage
keeps lower than 50V and
output
current keeps
higher than 30A(for 10K is
20A)for over 4 periods, the
fault
signal will be
displayed.
16
Inverter
3
(Line to
Neutral)Output
short circuit
When INV
3
output voltage
keeps lower than 50V and
output
current keeps
higher than 30A(for 10K is
20A)for over 4 periods, the
fault
signal will be
displayed.
1A None
Inverter
1
output
negative power
fault
When the output power on
the INV
1
terminal is over
-3000W(for 10k is
-1500W) for more than
20ms or -800W(for 10k is
-400W) for more than
100ms, the fault signal will
be displayed
Check if input and output connections are
correct. And then check if INV relay RY5 or
STS(Q13, Q14, Q17,Q18 and their driver
circuits) are OK. Also please check if the
power feedback load connected to the
UPS.