USV MT3200
Instruction manual
MT Series
Page 13 of 36
UPS “ON/OFF” switch:
This is used to switch the UPS on and off.
Providing the mains supply is still switched on, the charger also remains active
once the UPS has been switched off.
UPS “TEST” button (dual function):
When this button is pressed, the UPS changes from mains to support mode for
approximately 10 seconds. This is a means of checking the function of the
system and the batteries. If the UPS is already in support mode, the acoustic
warning signal can be cancelled manually by pressing this switch (approx. 2
seconds) until the “Battery low” status is determined.
6.1.2 Display elements of the UPS
Generally, all indicator elements are only active when the UPS is switched on
(main switch in “ON” position).
Line mode:
The UPS is operating using mains power. If the mains voltage tolerances
have been exceeded or if the mains fails completely, this indicator goes out
immediately. The same applies if a fuse at the mains input is disabled.
The display flashes if mains voltage is present but the equipment is switched
off.
Battery mode:
Support mode is active. The input mains power is not available or is outside
the tolerances. The energy required to continue supplying the UPS output is
drawn from the battery pack.
A.V.R. mode:
If an under- or over-voltage on the supply network is detected, the equipment
switches to A.V.R. mode. To protect the users, the output voltage is reduced
by 13% (“Buck” for over-voltage) or increased (“Boost” for under-voltage). The
equipment continues to operate using mains power.
Battery low display:
Warning limit of the battery pack.
The LED indicates whether the remaining battery capacity has fallen below a
fixed specified level during support mode. In on-line mode (charging of battery
pack), the LED goes out once a sufficient charge level has been reached.
When “Battery low” is displayed in support mode, this is the latest point at
which action must be taken to deal with the load through controlled shutdown
of equipment. The support time which remains once this indicator comes on
may be shorter than anticipated depending on the condition of the batteries
(age and/or temperature).