Simply pressing the start button on a machine that has been standing for a long period of time can be risky and should be avoided until the insulation of the motor has been checked for integrity. Degradation could occur as a result of moisture ingress in long standing motors typically found on plants that work seasonally or in applications where there is a high degree of water contamination.
The EC/ED relay, available from NewElec, solves this problem by monitoring the insulation of the motor windings and feeder cable cores to earth while the motor is standing. The main contactor being prevented from closing into a circuit in which the insulation level to earth has deteriorated to an unacceptable level.
The selected lock-out relay model determines the acceptable insulation level, while the fused measuring circuit protects the relay against inadvertent damage due to incorrect connections. Compact in design, the EC/ED is suitable for installation in flameproof enclosures and may be used on motors starting both direct-on-line or star-delta.
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