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How to wire voltage monitor
Why use voltage monitor?
The problems of low voltage and phase fluctuation (lower voltage on one wire) do not affect resistance loads like light bubs or electric water heater, except to make them burn at dimmer capacity.
However low voltage and phase fluctuations do affect inductive loads like contactors, relays, motors, pumps, HVAC causing problems such as chatter on contactors and relays, and lower rotation speed on motor, causing higher temperatures, and burning out the motor or shortening motor lifespan.
voltage monitor Single-phase Voltage monitor
Voltage monitor Protect motors and equipment from low voltage.
Adjustable voltage range
Caution: select monitor voltage to match incoming Line voltage
Select amp rating of contactor to match amp rarting of Load
Select matching contactor voltage and coil voltage range
Undervoltage on contactor coil will cause chattering, Overvoltage on coil will melt coil.

Buy:
Single phase 95-270 volt range
3-phase 80-300 volt range
ICM phase monitor
Siemens monitoring relay

Resources:
Fuseholders
Difference between single phase and 3-phase
IMC492 manual
Siemens .pdf
Siemens volotage monitor
Larger image
Siemens Single-phase Voltage monitor
Rated 24-240 volt AC

Buy:
Single phase monitor
"Switching a relay or solid state switch at the zero-crossing point reduces spark across the contacts, extending relay life, and also reduces EMI (electromagnetic interference)."
Resource:
Extend life of relay by switching at zero cross .pdf
ICM402 phase monitor IMC402 3-phase phase monitor
Protects against phase loss, phase reversal and phase unbalance.
Phase Loss Condition: Equals 25% of nominal for any given phase; system will shut down should this occur
Line voltage on 3-phase 190-600V
Control voltage 115-230V
Output to contactor max 30 amps
Contactor coil rated 27 amp inrush, 7 volt operation

Buy:
Single phase 95-270 volt range
IMC402
3-phase 80-300 volt range
ICM phase monitor

Resources:
Fuseholders
IMC 402 pdf
IMC400 manual
IMC400 wiringIMC400 3-phase phase monitor
Protects against phase loss, phase reversal and phase unbalance.

Buy:
IMC400 phane line voltage monitor
IMC450 3-phase voltage monitor


Resources:
Fuseholders
IMC 402 pdf
IMC400 manual
IMC450 manual

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