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

7.0 UPS Protection System

7.1

System Protection Features

The following one-line schematic illustrates the electrical locations of the protection devices
on the 75/80 kVA UPS models.
Input Abnormal
Power Flow
Isolating
XFMR
Input
Power
7.2

System Protection Functions

The following tables show the built-in UPS fault-protection functions of the 75/80 kVA
models.
Inverter Overvoltage
Protection Item
(IVOV)
INVERTER
LCD Message
OVERVOLTAGE
Cause
Control Malfunction; Feedback Error
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
(level-1)
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 closed
Alarm
Auto-Retransfer
Protection Item Memory error (EERR)
LCD Message
MAIN EEPROM ERROR
Cause
Control board chip error
Operation Mode
Start is inhibited
after Fault
Audible Alarm
Visible Alarm
Relay Contact
Alarm
Auto-Retransfer
T O S H I B A
Overheat
MCCB
Converter
Low Battery
Built-in UPS Fault Protection Functions
Inverter Undervoltage
(IVUV)
INVERTER
UNDERVOLTAGE
Yes: See Section 6.7 Audible Alarm Functions
Red Fault Lamp On
No
Low Battery Voltage
(level-2)
DC UNDERVOLTAGE
Battery Shutdown Level
reached
Shutdown: No Output
Yes: See Section 6.7 Audible Alarm Functions
NO
No
Internal overheat (OH)
OVERHEAT; INTERNAL
Fan failure; high ambient
Bypass operation; chopper and inverter are stopped
Yes; continuous buzzer
Fault relay closed; bypass relay closed
59
Over-Voltage /
Under-Voltage
Static
Bypass
Inverter
Charger/
Chopper
External
Batteries
UPS Overload
OUTPUT OVERLOAD
Overload or short circuit at the load.
Inverter Overload: Transfer to bypass; Inverter stopped.
Bypass Overload: Inverter, Chopper, & 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 closed
Inverter OL: Yes, if bypass OK — Bypass OL: No
Inverter Output Current Limit
OUTPUT OVERLOAD
Load Inrush current
If Bypass OK, transfer to bypass
If not, current-limit mode
Bypass Relay closed
Yes, if bypass OK
DC circuit overvoltage
(DCOV)
DC OVERVOLTAGE
Chopper malfunction
RED fault lamp On
NO
Current-Limit
Overload
Overcurrent
Output
Power
Overheat
NO
DC circuit overcurrent (DCOC)
DC OVERCURRENT
Inverter / chopper fault