Daikin MPS015 F Installation And Maintenance Manual

Contents

Field Wiring TerminalsAll field wiring terminals are spring clamp type, which offerseveral 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 portsWire connections require inserting (“1” in Figure 87) a strippedwire a round port and clamping the stripped wire by inserting aflat-bladed screw driver in the adjacent square port (“2”).Figure 87: Terminal ConnectorsPhase Voltage Monitor (PVM)The phase voltage monitor (Figure 88) is designed to protectthree-phase loads from damaging power conditions. Amicroprocessor-based voltage and phase sensing circuitconstantly monitors the three-phase voltages to detect harmfulpower line conditions. When a harmful condition is detected,its output relay is deactivated after a specified trip delay (TripDelay). The output relay reactivates after power line conditionsreturn to an acceptable level for a specified amount of time(Restart Delay). The trip and restart delays prevent nuisancetripping 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 32Figure 88: Phase Voltage MonitorTable 32: LED IndicationStatus LED IndicatorNormal operation, no faults, relayenergized Green LED - steady onLoss of input phase (relaydeenergized) 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 onPhase reversal (relay deenergized) Red LED - pulse on, off, on, off, etc.Restart delay (fault cleared, PVMpending restart, relay de-energized) Green LED - pulse on, off, on, off, etc.Other features:• Standard 2% to 8% variable voltage unbalance (“3” inFigure 88).• Standard 1 to 500 second variable restart delay (“2”).• Standard 1 to 30 second trip delay (“4”) (except loss ofphase, which trips at 1 second non-adjustable).IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS 104 www.DaikinApplied.commaInTenanCe