Ups Protection System; System Protection Features; System Protection Functions - Toshiba 4200FA Installation And Operation 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
Fault Relay closed; Bypass Relay closed
Alarm
Auto-Retransfer
Low Battery Voltage
Protection Item
Line-4 will read
LCD Message
"BATTERY LOW"
Cause Battery Discharge
Operation Mode
Battery Discharge
after Fault
Audible Alarm
Visible Alarm
Battery Lamp Flickers
Relay Contact Low Battery Relay
Alarm
Auto-Retransfer
4200FA Installation and Operation Manual
Input Abnormal
MCCB
Overcurrent
Low Battery
Built-in UPS Fault Protection Functions
Inverter Under-voltage
(IVOV) (IVUV)
INVERTER INVERTER
UNDERVOLTAGE
Control Malfunction; Feedback Error
Yes: See Audible Alarm Functions
Red Fault Lamp "on"
No
Low Battery Voltage
(Level-1) (Level-2)
DC UNDERVOLTAGE
Battery Shutdown Level
reached
Shutdown:
No Output
Yes: See Audible Alarm Functions
NO
closed
No
MBS
(Not available for LT units)
Bypass
Converter
Charger/
Chopper
External
Batteries
OUTPUT OVERLOAD
Overload or short circuit at the load.
Inverter Overload: Transfer to bypass; Inverter
stopped.
Bypass Overload: Inverter, Chopper, and Bypass
stopped.
Inverter OL: No Fault Lamp
Bypass OL: Fault Lamp "on"
Inverter OL: Bypass Relay closed
Bypass OL: Bypass Relay open and Fault relay
Inverter OL: Yes, if bypass ok
Inverter Output Current Limit
OUTPUT OVERLOAD
Load Inrush current
If Bypass ok, transfer to bypass; if not, current-limit
mode
Bypass Relay closed
Overcurrent
Overload
Output
Inverter
Power
Overvoltage/
Undervoltage
UPS Overload
closed
Bypass OL: No
NO
Yes, if bypass ok
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