Ladis G31 Series, Service Manual

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7.1.2 Trouble shooting for fault codes in LCD display
When the UPS is fault, it will transfer to Fault mode.
7.1.2.1 Fault code for 10k~20k
Code
LCD
icon
Fault Event Description Action
01 None
BUS soft start
failure
When
the bus voltage can’t
reach the setting value in
30s, the fault signal will be
displayed.
Check if power components such as IGBT and
SCR for the PFC and the utility power SCR are
well. Meanwhile, check if the components on
the drive circuit are well.
02 None BUS voltage high
When one of the following
conditions occurs, the fault
signal will be displayed.
1. +Bus voltage keeps
higher
than 450V or
the
–BUS voltage keeps
lower than
–450V for more
than 200ms.
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.
03 None BUS voltage low
When +Bus voltage keeps
lower
than 300V or
the
–BUS voltage keeps
higher than -300Vfor more
than 200ms, the fault signal
will be displayed.
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.
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
Output short
circuited
When INV output voltage
keeps lower than 50V and
output current keeps higher
than 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.
1A None
Negative power
fault
When the output power on
the INV terminal is over
-800W(20K:-1600W)
for
60ms or over
-2400W(20K:-4800W) for
20ms, the fault signal will
be displayed.
Check if input and output connections are
correct. And then check, for 10KVA: if INV relay
RY5 or STS(Q13,Q14,Q20,Q31 and their driver
circuits) are OK; for 20KVA: if INV relay RY5
and
RY6 or STS(Q13, Q14, Q17,
Q18,Q19,Q20,Q21,Q22 and their driver
circuits) are OK;
21 None
Battery SCR short
circuited
When battery voltage is
more than 310V for 4s, the
fault
signal will be
displayed.
It is probably the charger or PFC board
damaged.
Check if the battery SCR(Q21,Q27, Q26, Q49,
Q46,Q58). If PFC board is ensured ok after
checking, it may indicate there is something
wrong with charger output.
Check if components for the battery drive
signals are normal. Check circuit of the utility