Daikin MPS026 F - Phase Voltage Monitor (PVM)

Field Wiring Terminals
All eld wiring terminals are spring clamp type, which offer
several advantages over traditional screw-type terminals:
• Spring connections do not require torquing
• Spring connections resist failure due to vibration
• Easily identiable terminal markers
• Combination spring release and square test ports
Wire connections require inserting (“1” in Figure 87) a stripped
wire a round port and clamping the stripped wire by inserting a
at-bladed screw driver in the adjacent square port (“2”).
Figure 87: Terminal Connectors
Phase Voltage Monitor (PVM)
The phase voltage monitor (Figure 88) is designed to protect
three-phase loads from damaging power conditions. A
microprocessor-based voltage and phase sensing circuit
constantly monitors the three-phase voltages to detect harmful
power line conditions. When a harmful condition is detected,
its output relay is deactivated after a specied trip delay (Trip
Delay). The output relay reactivates after power line conditions
return to an acceptable level for a specied amount of time
(Restart Delay). The trip and restart delays prevent nuisance
tripping due to rapidly uctuating power line conditions.
There are two LEDs on the face of the PVM (“1” in Figure 88)
to indicate the following items in Table 32.
Figure 88: Phase Voltage Monitor
Table 32: LED Indication
Status LED Indicator
Normal operation, no faults, relay
energized
Green LED - steady on
Loss of input phase (relay
deenergized)
Red LED - ash twice, off, ash twice,
off, etc.
Voltage unbalance (relay deenergized)
Red LED - ash twice, off, ash twice,
off, etc.
High or low voltage (relay de-
energized)
Red LED - steady on
Phase reversal (relay deenergized) Red LED - pulse on, off, on, off, etc.
Restart delay (fault cleared, PVM
pending restart, relay de-energized)
Green LED - pulse on, off, on, off, etc.
Other features:
• Standard 2% to 8% variable voltage unbalance (“3” in
Figure 88).
• Standard 1 to 500 second variable restart delay (“2”).
• Standard 1 to 30 second trip delay (“4”) (except loss of
phase, which trips at 1 second non-adjustable).
IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS 104 www.DaikinApplied.com
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