Energy Monitoring & Motor Protection Board - MultiTrode MultiSmart Installation & Operation Manual

MultiSmart Installation & Operation Manual
7.6 Energy Monitoring & Motor Protection Board
The Energy Monitoring and Motor Protection Board (3MP) is an optional board. It monitors single or 3-phase
motor currents for up to 3 pumps, direct from CTs, and provides motor protection and power monitoring. The
board also carries out an automatic 1000V DC insulation resistance test on the motor windings.
additional 5 digital outputs and 3 analog outputs are on board.
NOTE: Power monitoring requires 3-phase supply monitoring located in the same MultiSmart unit. The
3PC board has 3-phase supply inputs. Therefore you must have a 3PC board and a 3MP board in the
same unit to do power measurements. MultiSmart can monitor single phase supply as well.
7.6.1 Insulation Resistance Tester
The 1000 VDC Insulation Resistance Tester is connected to the motor windings and periodically tests them
for insulation breakdown. See Section 17.2 for details on how to configure the tester.
Figure 56 – Connecting the IRT
Insulation resistance measurements are only performed when the motor is stopped. Therefore the motor
windings must be connected in a star or delta configuration when it is stopped in order to ensure all windings
are tested. The MultiSmart can be set with two thresholds for the Insulation Resistance Test, one for a
warning message, the second for a fault message. The default setting of the IRT warning does not stop the
pump whereas the IRT fault message does stop the pump.
Wire one winding from each motor controlled by the MultiSmart pump station manager.
Connect the Protective Conductor Terminal, to earth/ground.
NOTE: Follow the manufacturer's guidelines regarding motor insulation testing when using soft starters
and VFDs. Functionality is included in the MultiSmart software so that a DOUT can drive isolation
contactors while IRT is in progress - refer to Section 17.2.2.
7.6.2 Digital Volt-Free Outputs
The board has five isolated volt free outputs rated for 5A at 240V AC.
Figure 57 – Digital Volt-free Outputs
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