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T1000 Series UPS Installation and Operation Manual – 91074-002
16. UPS Protection System
16.1 UPS Protection Devices
The following schematic shows the electrical locations of the protection devices on the UPS.
16.2 UPS Protection Devices Fault Response
The following charts show the UPS response to common faults.
TABLE 16-1
:
UPS FAULT PROTECTION FUNCTIONS
Protection Item
Output Overvoltage Output Undervoltage
Output Overload
LCD Message
VOOV
VOUV
OL110
Cause
Control malfunction;
EEPROM error
(reprogram or replace)
Control malfunction;
Fuse opened; Load issue
Loading that exceeds design
parameters
Operation Mode
After Fault
Bypass operation – Chopper and inverter are
stopped
Inverter OL: Transfer to bypass;
Bypass OL: Inverter stopped,
chopper continues to boost DC
bus
Audible Alarm
Continuous buzzer
See Audible Alarm Functions on
page
Visible Alarm
Red Fault LED on
Inverter OL: Fault lamp off
Bypass OL: Fault lamp on
Relay Contact
Alarm
Fault relay closed
Bypass relay closed
Fault relay open;
Inverter OL: Bypass relay closed
Bypass OL: Bypass relay open
Auto-retransfer*
No
Inverter OL: Yes if bypass is OK
Bypass OL: No
Input
Abnormal
Low Battery
Level
Overheating
Overcurrent
Current Limit
Overload
Overvoltage/
Undervoltage
Output
Power
Line Filter
Inverter
*Static Switch
Optional
Transformer
Input
Power
Input
Fuse
Power Flow
Bypass
* Switches are
solid state
devices.
MCCB
Output
Fuse
MOV Over-
current
Protection
Batteries
+
–
Rectifier/
Chopper
Negative
Bus
FIGURE 16-1
:
UPS PROTECTION DEVICE LOCATIONS
Summary of Contents for T-Series T1000
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