Tescom DS3550 User Manual page 35

R20 INPUT CB OPEN
The input of the UPS is isolated from mains power with contactor ,this message will be shown with another
alarm always. Check the other alarm code.
R21 PFC STOP
Rectifier is stopped itself wait it must start again, another alarm code shows the reason of the rectifier stop.
Wait for 1 minute if alarm continues call service.
R22 POS CHG LIMIT R23 NEG CHG LIMIT
,
This message is normal if the battery charge current is rached to limit value during battery charge.
R24 WAITING DC BUS
The DC BUS voltage of the UPS is not enough to startup wait 2 minutes if message continues call service.
R25 BATTERY FAILURE
At the last battery test one or more defected batteries found, call service.
R26 BATT TEMP SENSOR
Battery temperature sensor mulfunction, call service.
R27 BATT TEMP HIGH
If batteries are located at the outside of the UPS cabinet check battery ambient temperature if hot use air
cooling system. If batteries are internal check the UPS ambient temperature if normal call service.
L02 TH2 TEMP HIGH L04 TH2 TEMP LOW
,
UPS TH2 cabinet inside temperature is out of tolerance check the followings:
-If UPS air inlets and outlets covred by dust clean
-If any material prevents air flow at UPS air inlets or outlets take the material
-If UPS ambient temperature is high then 45 C ,use air cooling system
L05 FAN MAINT
Maintenance due of the cooling fans of the UPS, call service.
L06 BATTERY MAINT
Maintenance due of the UPS batteries, call service.
L08 TH1 SENSOR FAIL L09 TH2 SENSOR FAIL
,
TH1 or TH2 temperature measurement sensors are defected, call service.
L10 ENTER FAULT RESET
Call service
L11 BATT CB OPEN
The battery switch of the UPS is OFF, in this case UPS runs normally but if mains failure alarm occures the
output voltage of the UPS shutdown. Please turn ON the battery switch.
L12 GENERAL MAINT
Maintenance due of the general maintenance, call service.
L13 PFC CAN COMM ERR
Call service.
L14 INV CAN COMM ERR
Call service.
A00 INV FAULT = XXXX
Call service.
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