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MASTERYS BC 100-120 kVA - Ref.: IOMMASBCXX07-EN 05
6. OPERATING PROCEDURES
6.2. SWITCHING ONTO MAINTENANCE BYPASS
Switching onto maintenance bypass creates a direct connection between the UPS input and output, completely excluding the
equipment control element. This operation is performed in the event of standard maintenance on the equipment, so as not to
remove the power supply from the load, or in the event of a serious failure while waiting for the equipment to be repaired.
• Enter menu MAIN MENU > COMMANDS > UPS PROCEDURES
• Select On Maint. Bypass Procedure and press ENTER
• Carry out the operations indicated on the display.
If there is an external manual bypass, carry out the procedure described above before activating this switch.
In the case of UPSs connected in parallel the maintenence bypass procedure is available in MAIN MENU (SYSTEM)
and affects the whole system.
6.3. SWITCHING ON FROM MAINTENANCE BYPASS
• Put switch Q1 into position 1 (mains ON).
• Wait for the display to switch on.
• Enter menu MAIN MENU > COMMANDS > UPS PROCEDURES.
• Select Automatic Start Procedure and press ENTER.
• Carry out the operations indicated on the display.
If there is an external manual bypass not monitored from the UPS, or a parallel system, put the switch to position OFF
to avoid overlap of mains and inverter.
6.4. EXTENDED OUT OF SERVICE
If the UPS is deactivated for some time the batteries must be recharged regularly. They should be recharged every three months.
• Connect the mains and auxiliary mains to the UPS.
• Put switch Q1 into position 1 (mains ON).
• Wait for the display to switch on.
• Close the external battery breaker/fuses.
• Put or keep switches Q3 (output) and Q5 (maintenance bypass) in position 0.
• The battery must be charged for at least ten hours.
• Once ten hours have elapsed open the external battery breaker/fuses.
• Put switch Q1 into position 0 (mains OFF).
6.5. EMERGENCY SHUTDOWN
Should it be necessary to interrupt the continuous power provided by the UPS quickly (emergency shutdown) this can be done
by putting switch Q3 to position 0.
The UPS output can only be electrically disconnected by means of Q3.
If the UPS is operating from the maintenance bypass (Q5 in position 1) with the mains present, the emergency
shutdown does not interrupt the power supply to the load. In emergency conditions all power supplies upstream of
the UPS must be disconnected.
6.6. UPS GENERAL POWER OFF
Using a button/switch connected to the ADC (Advanced Dry Contacts) card it is possible to interrupt the continuous power pro-
vided by the UPS (see chapter 8).
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