AMF Panel, Application : Power Supply

Specification For Standard Automatic Failure Panel

-> Floor Mounting , Cubicle Type Automatic Panel comprising of :

    # 1 - TP Contractor with HRC Fuses for MAINS (Upto 380 KVA)

    # 1 - TP Contractor with HRC Fuses & Thermal Overload Relay

       for Alternator (Upto 380 KVA)

    # 2 - Neutral Contactor for MAINS & ALTERNATOR

    # 1 - Volt meters with Selector Switches for MAINS & ALTERNATOR

    # 1 - Ammeter with Selector Switch, Frequency Meter

    # 3 - Current Transformers

    # 1 - Battery Charger , consisting of Transformer/Rectifier with

       surge protection network DC Voltmeter, DC Ammeter Selector

       Switch for Trickle, Off & Boost & Current Adjust

    # 1 - Mains supply Failure Monitor (voltage sensing )

    # 1 - Supply Failure Timer & Restoration Timer

    # 1- Control Unit incorp. 3 impulse automatic engine start/stop and failure to sart'

      lockout

    # 1- Off/Manual/Auto/Test Selector Switch

    # 1 - ON/OFF Circuit Switch

-> LAMP INDICATION & TRIP ANNOUNCIATION SCHEME

Condition                                Indication                        Trip Announciation

Main ON                                           Yes                                                   -

Generator ON                                   Yes                                                   -

Load on Mains                                  Yes                                                   -

Load on Generator                            Yes                                                   -

Low Lube Oil Pressure                       Yes                                                   -

High Water Temperature                   Yes                                                   -

Set Fails to Start (with Alarm)           Yes                                                   -

Push Buttons/ Switchesfor:

Engine Start/ Stop, Alternator Contactor ON/ Off & Mains Contactor Off / AMF Test

WORKING OF THE PANEL :

-> AUTO MODE

When the supply fails, the 'Mains supply failure Monitor' operates after preset time of approx. 10 Secs. This actuates the '3 impulse Engine Start' control unit The Control Unit gives three starting impulses with an interval of 1-5 Secs, if the engine starts at the first impulse , this unit shuts off. If not , it gives further two impulses during which time, if the engine does not start, the unit shuts off, activating the audio-visual alarm for 'Set Fails to Start'. On Starting of the engine, the alternator switch gear closes automatically after the preset time of 1-10 Secs. When the Mains Supply is restored , the 'Restoration Timer' operates and after the preset time of 10 Secs., the load is automatically transferred to the Mains, and the Generator shuts down.

-> TEST MODE

By operating the 'AMF Test' Push Button, the conditions of Mains Failure are stimulated as explained in the Auto Mode above, without disturbing the supply through mains Switchgear.

-> MANUAL MODE

The DG Set operates as a standard manual operated set , and all its functions are carried out manually by means of 'Engine Start/Stop' and 'Alternator Contactor ON/OFF' Push Buttons.