The 320 to 327 series relays from NewElec are designed with a fixed thermal curve that results in as little as a 200 s trip delay for a sustained overload condition of only 1%. Cyclic overloading conditions are monitored via the built-in thermal memory so that successive cycles of overloading will eventually cause a trip condition. Phase unbalance and phase loss conditions result in a trip delay of 4 s. The relay series caters for prolonged starting times by permitting the user to select a start time period.
The 320–327 series relays provide comprehensive motor protection
Relays in the series are simple to configure, requiring only limited information about the motor for correct protection setup. The information needed comprises:
* Full load rating of the motor.
* Manufacturer's recommended permissible starts per hour.
* Actual time required to accomplish a complete start, as installed.
The standard relay can be chassis or door mounted, requires an auxiliary power supply of 110 or 220 V a.c. and protects against running and start stall conditions. An automatically self-calibrated 4-20 mA output loop is a useful addition when an analogue value of motor load is required for PLC control. Fault finding is simplified through diagnostic LEDs on the relay control panel face.
To further enhance the protection benefits of this product it is possible to add the following features: earth and short circuit protection fault elements; immediate overload warning; and a back-tripping facility into a back-up ACB or OCB by means of a shunt when the circuit is exposed to high energy fault conditions. Accelerated or delayed trip times for high-energy faults and pre-programmed limited start attempts are other options.
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