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PMSTR-4000 Quick Start Tips September 15, 2021 The PMSTR-4000 Plant Master controls up to eight NXF4000 and/or PPC4000 in any combination using a central sensor. The connection from the PMSTR-4000 is via Modbus and uses the dedicated sequencing bus. WIRING The Modbus terminals for the sequencing bus are on connector P12: ...
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PMSTR-4000 Quick Start Tips September 15, 2021 CONFIGURATION OF PMSTR-4000 Option parameters are used to configure the PMSTR-4000. To access the option parameters, press the gear icon. Enter 903 when prompted for a passcode. The recommended first step when configuring a new installation is to apply the default settings by setting option 12.0 to 1.
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PMSTR-4000 Quick Start Tips September 15, 2021 USING MODBUS MONITOR TO VERIFY COMMUNICATION STATUS A Modbus monitoring program such as ModScan or Shortbus Modbus Scanner can be used to check if communication is active. Connect the Ethernet port of the PMSTR-4000 to a PC and set up a static IP address to match that of the PMSTR-4000.
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PMSTR-4000 Quick Start Tips September 15, 2021 TROUBLESHOOTING MODBUS COMMUNICATION ISSUES Here are some common issues with Modbus wiring between the PMSTR-4000 and the connected units: Modbus wiring is backwards – swap the wires between A+ and B- on the PMSTR-4000 terminal block.
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PMSTR-4000 Quick Start Tips September 15, 2021 MESSAGES Once a unit is ONLINE, the NXD410TS will display a message on the home screen to indicate the current sequencing command status. The NXTSD507HD and NXTSD512HD will display a similar message. ...
PMSTR-4000 Quick Start Tips September 15, 2021 HOT STANDBY If sequencing is used, sensor 2 on the unit can be connected to a shell temperature sensor to enable the hot standby feature. Setpoint 2 on the unit is configured to the standby setpoint and whenever the sequenced slave disable command is sent, the control will override this to maintain the standby water temperature.