Operating instructions

Description of Operation
•
120 VAC, 1φ input power (15A / 20A circuit) supplied to MVPN
• Input power status light is illuminated
• Power routed within MVPN to Normal / Bypass transfer switch
• In Normal mode
• Power routed from Normal/Bypass switch to the POWERVAR
UPM
• POWERVAR UPM conditions power and provides battery
backup
• 120 VAC, 1φ power conditioned UPM output is wired back to
the MVPN
• Output power status pilot light is illuminated
• MVPN provides power conditioned, battery backup source to
dedicated, hardwired receptacles and equipment
• In Bypass Mode
• Power is routed from Normal / Bypass switch directly to
dedicated receptacles and equipment, bypassing the UPM
• Output power status pilot light remains illuminated and does
not flicker during the transfer (make before break)
• Remote Power Off (RPO) Switch - 15 amp “push / pull” type
mushroom switch wired through the normally closed (N/C) contacts
• When RPO is pushed, output power from the UPM is
disconnected from the dedicated receptacles / equipment
• When the RPO is pulled, output power from the UPM is
reconnected to the dedicated receptacles / equipment
Theory of Operation
Isolated ground (IG) receptacles (identified by their orange color or
an orange triangle) are used with sensitive electronic systems to
provide a separate ground reference point from the safety or
equipment ground required to protect personnel from fault currents
that might arise out of short circuit in the load.
Typically, the IG conductor must be run back to the electrical service
entrance grounding terminal of the facility, which can result in
common mode voltage arising from induced noise voltages from
other parallel conductors in the same raceway and panelboards.
The National Electrical Code (NEC) allows for an alternative method
of eliminating common mode noise disturbances through the use of
a “separately derived system.” The POWERVAR UPM constitutes a
separately derived system because its internal, low impedance,
isolation transformer has its output neutral bonded to ground.
The MVPN provides the necessary power interface between the
output of the UPM and the remote, hard wired receptacles. There
are other practical operational and maintenance features as well.
MVPN Specifications
•
Battery backup time - 6 min. full load / 20 min. @ half load
• Requires one (1) 120 VAC, 1φ input (15 or 20 amps)
• Requires one (1) POWERVAR model ABCE1440-11
• Maximum load of 12 amps @ 120 VAC (1440 VA)
• Pilot light status indicators for input / output power
• Make before break bypass / transfer switch
Mac Victor Power Network Benefits
•
Convenience - Space is frequently a valuable commodity in the
small store format. The MVPN permits all critical equipment within
the small store environment to receive conditioned, uninterruptible
power without the need for distributed UPS or power conditioners.
• Assures that all connected loads are on the same phase / circuit
• Provides for true isolated power from other noise sources
• Easier maintenance - the bypass / transfer switch allows for
removal of the UPM for maintenance or service without disrupting
power to the critical electronic loads
• Input and output power status indicators make diagnostics easy
• Optional RPO (REMOTE POWER OFF) provides for remote
disconnection of the UPM
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