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TOSHIBA
43
UPS Protection System
System Protection Features
The following schematic shows the electrical locations of the protection devices on the
1600EP models.
System Protection Functions
The following charts show the built-in UPS system fault protection functions on all the
1600EP models.
Built-In UPS Fault Protection Functions
Protection Item
Output overvoltage Output undervoltage Output overload
LCD Message
Cause
Control malfunction;
chip error
Control malfunction;
wire disconnected
Overload;Short circuit at load
Operation
Mode After
Fault
Bypass operation;
Chopper and inverter are stopped
Inverter OL: Transfer to bypass;
inverter stopped
Bypass OL: inverter, chopper
and bypass stopped
Audible Alarm
Yes; continuous buzzer
See ‘Audible Alarm Functions’ on
page 24
Visible Alarm
Red Fault LED “on”
Inverter OL: no fault lamp
Bypass OL: fault lamp “on”
Relay Contact
Alarm
Faulty 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
OUT-OV OUT-UV
OVER LOAD
Inverter
*Switches are
solid state
devices
Input
power
Surge
absorber
MCCB
Line Filter
Input
fuse
Re cti f i e r /
Chopper
Batteries
+
_
Bypass
*Stati c
switch
Isolation
Tr ans for mer
Ou tp u t
fuse
Line Filter
Output
power
Power flow
Input
Abnormal
Low Battery
Level
Overheating
Overvoltage/
Undervoltage
Current Limit
Overload
Overcurrent