Ups Protection System; System Protection Features; System Protection Functions - Toshiba 4200FA CT/XT User Manual

7.0 UPS Protection System

7.1

System Protection Features

The preceding one-line schematic illustrates the electrical locations of the protection
devices on all UPS models.
Input Isolating
Power XFMR
7.2

System Protection Functions

The following chart shows the built-in UPS fault protection functions on all models.
Inverter Over-voltage
Protection Item
LCD Message
OVERVOLTAGE
Cause
Operation Mode
Bypass Operation; Chopper and Inverter Stopped
after Fault
Audible Alarm
Visible Alarm
Relay Contact
Alarm
Auto-Retransfer
Low Battery Voltage
Protection Item
LCD Message
"BATTERY LOW"
Battery Discharge
Cause
Operation Mode
Battery Discharge
after Fault
Audible Alarm
Battery Lamp Flickers
Visible Alarm
Low Battery Relay
Relay Contact
Alarm
Auto-Retransfer
4200FA CT/XT User's Manual
TOSHIBA
Input Abnormal
MCCB
Overcurrent
Low Batteryt
Built-in UPS Fault Protection Functions
Inverter Under-voltage
(IVOV)
INVERTER INVERTER
UNDERVOLTAGE
Control Malfunction; Feedback Error
Red Fault Lamp "on"
Fault Relay closed; Bypass Relay closed
No
Low Battery Voltage
(Level-1) (Level-2)
Line-4 will read
DC UNDERVOLTAGE
Battery Shutdown Level
Shutdown:
No Output
closed
No
MBS
Bypass
Converter
Charger/
Chopper
External
Batteries
(IVUV)
Overload or short circuit at the load.
Inverter Overload: Transfer to bypass; Inverter
stopped.
Bypass Overload: Inverter, Chopper, and Bypass
stopped.
Yes: See Audible Alarm Functions
Inverter OL: Bypass Relay closed
Bypass OL: Bypass Relay open and Fault relay
Inverter Output Current Limit
Load Inrush current
reached
If Bypass ok, transfer to bypass; if not, current-limit
mode
Yes: See Audible Alarm Functions
NO
Bypass Relay closed
Inverter
Overvoltage/
Undervoltage
UPS Overload
OUTPUT OVERLOAD
Inverter OL: No Fault Lamp
Bypass OL: Fault Lamp "on"
closed
Inverter OL: Yes, if bypass ok
Bypass OL: No
OUTPUT OVERLOAD
NO
Yes, if bypass ok
Overcurrent
Overload
Output
Power
60