18
MASTERYS
BC 60-80 kVA - Ref.: IOMMASBCXX06-EN 06
4.2. SWITCH FUNCTIONS FOR THE 60-80 kVA RANGE
With common mains input:
• Input switch Q2:
- The input switch provides the primary power supply to the UPS.
- In normal operating conditions this should be in position
1 ON
.
- The position
0 OFF
will cause the batteries to discharge.
With separate mains inputs:
• Input switch Q4:
- The switch provides the power supply to the automatic bypass line.
- In normal operating conditions this should be in position
1 ON
.
WARNING!
in this configuration the mains power supply to the rectifier cannot be isolated inside the UPS, only via external
protection devices.
• Output switches Q3 and Q5:
- These
are
used
to
manage
UPS
output.
Q3
connects the UPS output to the inverter (continuous power supply).
Q5
connects the output directly to the auxiliary mains
input (manual bypass).
- Positions
Q3 closed (1)
and
Q5 open (0)
: this is the position for normal operation of the UPS for a continuous power supply to
the load.
- Position MANUAL BYPASS
Q3 open (0)
and
Q5 closed (1)
: this position should only be selected for standard or special main-
tenance operations (manual bypass); the load is connected directly to the auxiliary mains.
It may be used in the event of a UPS failure to power applications from the auxiliary mains while awaiting the intervention of
technical personnel.
Refer to the relevant procedure described below on how to activate the bypass; see chapter 6.
- Positions OFF
Q3 open (0)
and
Q5 closed (0)
: this completely isolates the UPS output by removing the voltage from the appli-
cations
in
any
operating
conditions.
It is used for the emergency shutdown of the system (internal ESD).
3. ACESS TO CONTROLS