Established 1984

Specialising in lighting solutions for over 25 years

DC Emergency Systems Limited has uniquely grown its business by referrals by offering support services to existing service providers operating primarily in the lighting market within the UK.



Test System (PALS) Control Panel and Modules.

Regular testing and maintenance of emergency lighting systems is required by law. The PALS™ addressable emergency lighting systems offers it's users simplicity, versatility, ease of use and reliability whilst taking responsibility for the important job of monitoring, testing and maintaining test records of an emergency lighting installation.

Each luminaire is fitted with an analogue addressable communications device which is connected to a two core data communication loop which transmits to and from the PALS™ control panel. The system operates pro-actively rather than passively and the PALS™ control panel communicates with every luminaire every 15 seconds to ensure that the luminaire is not only in a healthy condition but is still connected to the system.

Where the PALS™ system finds it is unable to communicate with a luminaire the fault is reported as a communication error. This aspect of the PALS™ system provides a positive advantage over passive systems in that PALS™ communicates faults within the installation, as well as luminaires and local supply failures almost instantly.

Installation requirements
PALS™ system uses an analogue addressable control panel which is microprocessor based and is programmed with the operating software and site specific information. This includes the type and location of each emergency luminaire within the system. It does not require an external computer for any of its functions.

The luminaires are connected to the panel via a data communication loop and each luminaire is provided with its own address number (up to 126 per loop) which is easily preset at our factory or locally with a DIL switch. The standard PALS™ can be supplied with up to 4 loops but larger systems can be supplied to special order.

A complete data loop is the preferred method of installation. The panel loop outputs and each addressable luminaire has integral short-circuit isolators to prevent data corruption or damage occurring in the event of a short circuit at any point in the communication loop.

In self contained emergency lighting systems, the emergency luminaires are connected to the appropriate local lighting circuit in the normal way (as required by BS5266), to provide the un-switched supply for the purposes of providing the battery charge supply. In the slave systems the mains supply is monitored to provide sub-circuit protection.

The PALS™ control panel requires a 230V ac supply (alternative voltage models are available) and is fitted with an integral power supply. When ordered with the optional maintenance free sealed recombination lead acid battery this is able to maintain operation in the event of failure of the control panel supply.

The PALS™ Control Panel
The PALS™ analogue addressable control panel can be supplied pre-programmed with the site specific data relating to the installation. Changes and updates can be made easily either by using a compatible PC or by using the on-board alpha-numeric keypad which uses text prompts and yes/no routines to make programming both simple and quick. To ensure the security of the system, changes can only be made through the engineer's access routines all of which are pass coded in order to gain entry.

The panel displays information relating to the system status upon an eighty character back-lit liquid crystal display. When programmed to provide information upon the location of a luminaire, twenty characters are available for describing the area of the luminaire (zone) and a further twenty can be used to specifically describe the exact location. The remainder of the display is then used to provide information regarding the nature of the fault.

Within the panel is a five hundred event memory log which can be accessed using the keypad and read upon the LCD display. A printer can be provided either separately or integral to the PALS™ control panel to provide a hard copy of the event log, or the PALS™ system can be interfaced with a compatible computer.

PALS™ control panels can have mimic panels provided where the information needs to be available at more than one point within an installation. For large sites and multi-users, panels can also be networked together either by hard-wiring or via modems through the telephone network. For the ultimate in ease of identification and control, a PC based graphic package offering full system control and interrogation facilities, with visual event location can be supplied.

The Test Routine
The PALS™ system is designed to provide users with a secure, superbly reliable system for automatic testing of emergency luminaires with continuous monitoring of the system achieved through state of the art analogue technology.

Test routines can be programmed to take place automatically at selected times. To satisfy the requirements of BS5266 Part 1, EN50172 or other local requirements, it is very easy to program in your own test requirements. For instance, these may be at weekends for office premises or holidays for shops, when the premises are most likely to be empty and time can be given for the batteries in the emergency lighting luminaires to recharge before the building is occupied again. Alternatively, for premises such as train stations, continuous process manufacturing plants, elderly persons homes and hospitals, the test can be carried out on either individual luminaires or in groups at varying times so a building is never left without some degree of protection and cover.

Test routines can be activated manually from the control panel for any luminaire, zone, loop or for the complete system. After any test, either manually or automatically initiated, a full report is received from each luminaire by the PALS™ control panel and which optionally can be printed in hard copy. Any faults found will be displayed upon the PALS™ panel so that the necessary action can be taken to service or repair the failed emergency luminaire.

For self contained emergency luminaires the test routine is conducted in the following manner:

1. The emergency luminaire's internal charger is monitored for charge current with the un-switched supply live to assess the battery and charger condition.

2. The un-switched supply is then interrupted and the discharge current from the battery is monitored.

3. The light output of the emergency fluorescent lamp is monitored and assessed throughout the selected duration of the test, for tungsten lamps the current drawn by the lamp is monitored.

4. When the un-switched supply is re-instated at the end of the discharge period, the emergency luminaire is checked for a charger healthy condition.

Any failure found, or which takes place during the test routine, is reported immediately to the PALS ™ control panel.

For Slave systems operated from a central battery system, a similar test routine is carried out except that the central battery system is also fitted with a communications device connected to the central system. This device is required to place the central battery system into the emergency mode to test the entire system under mains failure load conditions.

Where local sub-circuit monitoring is required, the preferred method of operation is to use slave luminaires that monitor the local supply individually as this is the most easily controlled by the PALS™ system. Where contactor panels are used to monitor local lighting circuits at the lighting distribution boards, additional communication devices with supporting software will be required to over-ride the contactor panels during test routines.

Product Selection
The PALS™ panel can only be used with emergency luminaires fitted with DC Emergency Systems Limited analogue addressable ballasts.

DC Emergency Systems Limited can supply non-maintained, maintained, sustained and slave luminaires fitted with the PALS™ ballasts as well as a full range of self contained and slave conversion kits for use in mains fluorescent luminaires up to 70 watt.

Where conversion kits are to be installed within luminaires from a manufacturer other than DC Emergency Systems Limited we strongly recommend that the conversion be carried out by ourselves to ensure correct operation. All emergency lighting conversion kit installation is carried out under ISO9001/2002 in accordance with ICEL1004 and the finished product assessed for CE compliance and then suitably marked as such.

PALS™ self contained module
  • Constant communication with luminaires to prove system integrity
  • Reports charger or mains supply failure within 15 seconds of the event
  • Constant monitoring of lamps at all times - maintained systems option
  • Loops, zones and luminaires can be disabled to carry out maintenance work
  • Carries out daily, weekly, quarterly and annual tests - fully automatically
  • Full system and luminaires test can be manually activated at any time
  • Reports luminaire number, location and nature of the fault detected
  • On-board power supplies on the panel to maintain memory if power fails
  • Designed to fail safe whatever event occurs
  • Easy to use, tab style questions for programming and operating
  • On-board alpha numeric keyboard for easy updates and modifications
  • Integral or external printer available
  • Multi panel networking, modem communications and PC report and control
  • Panels available in a full range of finishes, both surface and recess mounting
  • Full technical back-up available from leading emergency lighting company
  • 126 luminaires per loop, loops can be up to 1 kilometre in length
  • Apart from the data loop, no special material or wiring are required
  • Easy to use, flexible and based upon tried and tested analogue technology

PALS™ Lighting Module - OEL-302
Dimensions: Depth 30 x width 50 x length 130 mm
80 grms
Fixing centres:
PALS™ Control Panel OEL-CA1
Height 350 x width 340 x depth 115mm
Weight: 10 kg (ex. Batteries)
Mains Supply: 230V 50Hz AC - other voltages are available
Standby: Integral charger for 12V, 6Ah Sealed lead acid battery (battery not included)
Warning output: 4 programable short circuit protected monitored outputs 1 amp per output maximum, total current 2 amps
Auxiliary relay: 2 programmable volt free change over outputs Contacts rated at 5 amps 250V max. per relay
Sensor circuit: 2 wire addressable loop
Loop protection: Short circuit protection on-board (i.e. without isolators in loop).
Signalling Lines: 1 expandable to 5 via plug-in line driver circuits
Devices per Line: up to 126 luminaires per line driver
Controls: Alpha-numeric key pad
Indicators: 20 Test zone LED's and audible buzzer

2 line by 40 characters backlit LCD
40 LED zone test indicators
40 LED zone fault indicators
10 LED system indicators
2 LED common fault indicators

Communications: 1 x RS485 serial port (OEL-485 plug in module required)
1 x on-board RS232 port (OEL-004 plug in module required)
Recommended Cable: For signalling line circuits: Beldon 8762, 8760 or 8719 is recommended.

Product Codes
OEL-302: PALS™ lighting module
OEL-CA1: PALS™ control panel
OEL-001: Line driver module (max. 5 per panel)
OEL-485: RS485 Plug-in Network interface
OEL-004: RS232 internal cable and gland
OEL-006: RS485 Networking modem and interface
OEL-009: Dot matrix printer
16-508: 12V 6Ah Sealed recombination Lead acid battery

PALS Network Diagram