41
7.2.1.
Troubleshooting guide. Alarm or fault
indications
Alarm or fault
Possible cause
Solution
Code
Description of the lCD panel
21
bus over Voltage
Fault due to positive DC bus overvoltage.
The UPS transfers the load over the inverter (battery mode).
22
bus Under Voltage
Fault due to positive DC bus undervoltage..
The UPS transfers the load over the inverter (battery mode).
23
bus Unbalance
Fault in the balancing of positive and negative
bUS.
The UPS transfers the load over the inverter (battery mode).
24
bus Short
bUS voltage decreases very fast.
Consult our KESS Support-Team
25
bus Softstart Fail
Fault of the DC bUS soft start.
Consult our KESS Support-Team
31
output Short Circuit
The UPS detects a wrong output imedance,
considering a short-circuit.
The UPS will make a shutdown afger five voltage cycles.
32
inv over voltage
inverter fault due to overvoltage.
The UPS transfers the load over the bypass (bypass mode).
33
inv Under voltage
inverter fault due to undervoltage.
The UPS transfers the load over the bypass (bypass mode).
34
inv Softstart Fail
Fault of the inverter soft start.
Consult our KESS Support-Team
41
output overload
output overload.
Check the load and remove the non-critical ones or if any load has failed or
it is damaged. The UPS is still working normally, but it can transfer to bypass
mode in case the problem persists or the load is increased.
when this condition is finished the alarm is cancelled.
42
inv overload Fault
The UPS transfers the load over the bypass
(bypass mode) due the inverter overload.
Check the load and remove the non-critical ones or if any load has failed
or it is damaged. The UPS will transfer the load over the inverter (battery
mode), when the load is the suitable.
43
byp overload Fault
The UPS doesn't supply output voltage on
bypass or ECo modes, due the overload.
Check the load and remove the non-critical ones or if any load has failed or
it is damaged.
81
Heatsink over Temperature
Heatsink overtemperature inside the
equipment is too high.
Check the UPS cooling and ambient temperature of the room.
93
back Feed
(only > 3 kVA)
on battery mode, bypass has voltage.
Transfer to manual bypass and consult our KESS Support-Team.
Do not touch the power supply terminals of the equipments that are
connected to an electrical installation supplied by a UPS. Even, it is
dangerous with no power supply, because the equipment is an energy
genset.
Tab. 8 Troubleshooting guide. Alarm or fault indications.
7.2.2. Troubleshooting guide. warning
indications
warning
Possible cause
Solution
Code
Description in the lCD panel
02
Utility Abnormal
input power supply out of range.
Check the AC input mains status.
04
Site wiring Fault
neutral fault to earth detected. The alarm is
triggered when there is a voltage difference
between the earth and neutral > 15V.
Reverse the polarity of the input cables
(phase and neutral). by default the detector is activated. it can be
deactivated through the control panel with lCD.
11
battery Disconnect
low battery voltage. it can be due a blown
fuse, wrong connection of the battery module
connector or fault in the connection among
them, either in the UPS or in the module.
Check the connection of the battery module with the UPS, if any. For
any other different incident or if the problem persists, contact our KESS
Support-Team.
12
battery low
The UPS works on battery mode and the
batteries are depleted (low or very lows).
it is a warning indication, because the remaining back up time depends on
the % of connected load. Depending on the load and quantity of external
battery module (options), the warning can be activated when there is a 25%
of their capacity.
13
Service battery
battery block voltage failure detected. The
charger has been deactivated as caution
measure.
Consult our KESS Support-Team.
15
Charger Fail
battery charge failure.
Charger is shutdown till the next charge cycle. Consult our KESS Support-
Team.
16
battery over Voltage
battery overvoltage.
Charger is shutdown till the next charge cycle. Consult our KESS Support-
Team.
71
EPo Active
EPo button open or close, depending ont he
selection set in the control pane. Factory preset
is open.
Check the status or condition of the EPo button.
