Daikin MPS015 F, Installation And Maintenance Manual

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Field Wiring Terminals
All field 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 identifiable 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
flat-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 specified trip delay (Trip
Delay). The output relay reactivates after power line conditions
return to an acceptable level for a specified amount of time
(Restart Delay). The trip and restart delays prevent nuisance
tripping due to rapidly fluctuating 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 - flash twice, off, flash twice,
off, etc.
Voltage unbalance (relay deenergized) Red LED - flash twice, off, flash 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).
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