Doc.No.: 03118-000-IS
Page 11 of 12
2.4 POWER
The operating power is 115/230 VAC as primary, and 24VDC as backup. The MPA 1600 system will
automatically switch between primary and secondary power source in case of mains failure. The
24VDC must be permanently present for mains transaction backup supply in order to avoid the system
boot sequence of approximately 30 seconds. The system is unavailable for operation during the boot
sequence.
As an optional safety precaution, the mains operating power may be pre-switched by means of a
mechanical contactor/switch-over module as long as the 24VDC backup supply is present to keep the
system from power fail during the switching period.
2.5 GLANDS
The cables enter the WP units by means of cable glands. Where cable glands are not supplied from
factory, the installer must adapt the glands to the actual cable outer diameter. This is to obtain the
specified inlet protection.
2.6 FERRULING
The conductors should be ferruled prior to termination onto the screw terminals.
2.7 MARKING
Each cable is to be marked with cable numbers.
Each conductor is to be marked with the specific termination numbers.
2.8 FASTENING
Where applicable, the cables and the conductors shall be clamped to the structure with cable ties.
2.9 PRESERVATION
Prior to, during, and after installation the equipment must be handled with care. And protected against
acid holding fluids, pollution, moist, impacts etc.
This is in order to avoid damaged equipment, for which Zenitel will claim void warranty.
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