Three-phase motor protection and control applications have been simplified with the introduction of the NewCode motor protection relay available from CHI Control, a division of Actom. The NewCode provides comprehensive motor protection with time and date stamped event and fault records, as well as integrated user configurable control logic functions and standard starter control blocks.
The seven field inputs and four relay outputs are fully configurable with a Profibus DPV 1 communication protocol. The use of a modular GSD file allows the user to select the cyclic data telegram from a single byte in and out to a maximum of 2 bytes out and 6 bytes in. By allowing acyclic data transmission, it caters for the accessing of critical but less frequently required data when the need to access this arises. The NewCode has been packaged into 45 mm wide DIN rail mounted housing with separate current sensing modules to suit different motor ratings. Control panel mounted LEDs indicate fault conditions as well as the status of the inputs and outputs to assist maintenance personnel via visual indication. Relay settings and configuration are automatically backed up in a memory module plugged into the T Bus expansion slot, which enables the transfer of all settings to a backup relay.
The NewCode configuration software is user friendly with logical groupings and useful accessories such as a 3-phase recorder (volts, amps and power factor), a spectrum analyser to measure harmonic content and a calculator. The actual value screen allows the viewing of the voltage, current, power, thermal capacity, status of field inputs and relay outputs as well as displaying the values of the PLC input bytes. This enables the monitoring of real-time actual values and status on one screen.
The test screen provides a simulation platform. It can be used by the system integrator or the commissioning staff to functionally test the NewCode relay or to train personnel. By entering typical plant operation values a ‘what if’ scenario can be created allowing relay behaviour and performance to be evaluated by watching input signals, status conditions and relay outputs. The simulator when used will trigger the event and fault recording as would occur in real-time. The system integrator can thus stimulate the inputs or current, voltage, frequency and power factor, whilst writing and debugging the PLC code before going to site to commission. The simulator is disabled the moment the relay detects main circuit current and reverts to being a protection and control relay.
Protection features include:
* Thermal overload.
* Locked rotor stall.
* Unbalanced current.
* Single phasing.
* Undercurrent or load loss.
* Starts per hour.
* Over/Under frequency.
* Over/Under voltage.
* Voltage phase rotation.
* Insulation failure.
* Earth leakage/fault.
Control is facilitated by timers, counters, logic truth tables, latches, a real-time clock, a pulse generator and comparators. The isolated digital field inputs (expandable up to 15) are rated to handle signals up to 230 VAC and the electro mechanical output relays (expandable up to 8) can switch signals up to 6 ampere at 250 VAC.
For more information contact Rob Hare, CHI Control Components, +27 (0)11 824 7400, [email protected], www.chicontrol.co.za
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| Email: | [email protected] |
| www: | www.profiafrica.co.za |
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