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94 4200FA Installation and Operation Manual
Figure 11-1 UPS Electrical Protection Sense Points
System Protection Functions 11.2
The following chart shows the built-in UPS fault protection functions on all models.
Table 11.1 Built-in UPS Fault Protection Functions
Protection Item
Inverter Over-voltage
(IVOV)
Inverter Under-voltage
(IVUV)
UPS Overload
Fault Message
INVERTER
OVERVOLTAGE
INVERTER
UNDERVOLTAGE
OUTPUT OVERLOAD
Cause
Control Malfunction; Feedback Error Overload or short circuit at the load.
Operation Mode
after Fault
Bypass Operation; Chopper and Inverter Stopped
Inverter Overload: Transfer to bypass; Inverter
stopped.
Bypass Overload: Inverter, Chopper, and Bypass
stopped.
Audible Alarm
Yes: See Audible Alarm Functions
Visible Alarm
Red Fault LED illuminated
Inverter OL: No Fault Lamp
Bypass OL: Fault Lamp “on”
Relay Contact
Alarm
Fault Relay closed; Bypass Relay closed
Inverter OL: Bypass Relay closed
Bypass OL: Bypass Relay open and Fault relay
closed
Auto-Retransfer
No
Inverter OL: Yes, if bypass ok
Bypass OL: No
Protection Item
Low Battery Voltage
(Level-1)
Low Battery Voltage
(Level-2)
Inverter Output Current Limit
LCD Message
VBLO VBSD OUTPUT OVERLOAD
Cause
Battery is 80%
Depleted
Battery Shutdown Level
reached
Load Inrush current
Operation Mode
after Fault
Battery Discharge
Shutdown:
No Output
If Bypass ok, transfer to bypass; if not, current-limit
mode
Converter
Overcurrent
Overload
Inverter
Bypass
Charger/
Chopper
Isolation
XFMR
External
Batteries
Output
Power
MCCB
MBS
(Not available for LT units)
Input
Power
Overcurrent
Low Battery
Input Abnormal
Overvoltage/
Undervoltage