General

The complete electrical emergency supply system will be divided into three different compartments, which are fastened together and have cut outs for inter enclosure connections. Clear termination markings will allow any one of the panels to be removed and replaced if required. The three panels are detailed below.


Main Control Panel

 This IP 54 powder coated RAL7032 Grey enclosure houses the PLC with engine/alternator protection, warning and shut down features. The PLC control and protection is offered by a 509AMF module. Coupled to this is a fully configurable potential free eight-way relay expansion module suitable for linking up with a VCON2 control and alarm system. Refer to accompanying documentation for information on this PLC and relay expansion module. All instrumentation is mounted on the door of the enclosure and consists of the following:

  • One 509DSEPLC with a four-position knob and back lit LCD.
  • One 48mmsq. five-digit hour meter.
  • One 72mmsq. voltmeter with a seven-position selector sitch.
  • One 72mmsq. pointer type frequency meter.
  • Three 72mmsq. colour coded ammeters.
  • One 72mmsq. battery charger DC ammeter.
  • One 72mmsq. battery charger DC voltmeter.
  • One 52mm dia. VDO zero center charge ammeter.
  • One 52mm dia. VDO type oil pressure meter.
  • One 52mm dia. VDO type engine temperature meter.
  • One mushroom type push button emergency stop.

Changeover and Bypass Panel

This IP54 powder coated RAL7032 Grey enclosure houses the AC3 rated 3 pole contactors. Correctly rated terminal blocks for utility, alternator and load are mounted on to removable chassis plate. The contactors are electrically and mechanically interlocked. Incoming utility supply is protected by four LT surge arrestors. The utility and alternator supplies are short circuit and overload protected by 5k A rated three pole circuit breakers.


AC Load distribution Panel (optional)

This IP54 powder coated RAL7032 Grey enclosure houses the terminal blocks and 5k A rated circuit breakers for distribution to the following circuits:
  • 15 amp 3ph type for rectifier 1.
  • 15 amp 3ph type for rectifier 2.
  • 15 amp 1ph type for plugs.
  • 15 amp 1ph type for lights.
  • 15 amp 1ph type for power supply.
  • 15 amp 1ph type for AWL .
  • 40 amp 30m A2 pole type residual current CB with earth leakage.

Alarm System

We can provide alarm-monitoring system (16 alarms). These monitor the radios, rectifiers, Generator and main supply. It also monitors the airconditioners, and alternates between the two so that they have equal operating times. These alarms are monitored at the "Switch".


BTS Equipment

Motorola Radio's and rack configurations of:
  • 2/2/2 = 40 amps
  • 3/3/3 = 68 amps
  • 4/4/4 = 80 amps
  • 2omni = 24 amps
Transmission Equipment

The power consumption here will depend on how many Transmission radios are being used per site. Which also depends on how the site is linked in the cell network. But this could be anywhere between one and six transmission radios or even more. We work on a average load = 7 amps (minimum 2 transmission radios/site) Grintek Rectifier configurations of:
  • 2/2/2 = 4 modules with 1 being on standby = 90 amps
  • 3/3/3 = 5 modules with 1being on standby =120 amps
  • 4/4/4 = 5 modules with 1being on standby = 120 amps
  • 2omni = 2 modules with 1 being on standby = 30 amps
Rectifiers will have 30 Amp modules installed.
We only need one rectifier rack for the above-mentioned modules.
Battery 100amp/hour 100 amp/hour configuration for:
  • 2/2/2 = 12 batteries
  • 3/3/3 = 16 batteries
  • 4/4/4 = 20 batteries
  • 2 omni = 8 batteries
For the 3/3/3 site (2/2/2 for 900mhz and 1/1/1 for 1800mhz) we will need 4 modules with one being redundant.