5 How to Operate
5-8. UPS unit operation (* for the case of UPS specification)
- 36 -
5-8. UPS unit operation (* for the case of UPS
specification)
5-8-1. Hardware functions
(1) External power supply monitoring function
The switching power supply voltage is monitored while the external power supply is in operation. If it
drops to or below 20 V, the UPS is switched on automatically assuming that the external power supply
is turned off (blackout occurs).
(2) UPS monitoring function (over discharge protection)
The battery voltage is monitored while the UPS is in operation. If it drops to or below 21 V, UPS is cut
off (stopped) automatically.
5-8-2. Operation at power-on
(1) Initial clear
To avoid false alarms, any input from the switches or information from the indicator part or
indicator/alarm unit is rejected for approximately 25 seconds after power-on.
5-8-3. Basic functions
(1) Power status display function
The POWER or BATT. lamp lights up according to the power supply status.
(1) External power supply in operation: Only the POWER lamp lights up.
(2) UPS in operation: Only the BATT. lamp lights up.
(3) Discharge test mode: Only the BATT. lamp blinks.
Off
ON
Blinking
Maintenance mode active