Grade 2 Boxed Power Supply 0.5 Amp Quick Guide

This product is suitable for use in systems designed to comply with PD6662:2010, EN50131-6 Grade 2 and Environmental Class 2. It is a Type A power supply. Rated Output = 0.5 Amp


  1. Mount the metal enclosure onto the wall.
  2. Connect the Live, Neutral and Earth terminals to the un-switched fused spur.
  3. Connect the 0V, tamper and fault outputs to the control panel as appropriate (see control panel manual for details).
  4. Connect the 12V power output to the system.
  5. Ensure that the tamper switch is connected to the PCB.
  6. Fit the battery.
  7. Switch on the AC supply and confirm that the ‘EPS’ and ‘APS’ LEDs are on.

External Power Supply (EPS) (AC Supply)

The power supply has a three way terminal block for Live, Neutral and Earth connections, and is
protected by a 20mm anti-surge fuse rated at 230V, 315mA. A replacement fuse MUST be the same
type and rating.
Mains Earth is connected to the power supply screening and metal enclosure; but is isolated from the
0V output.

Tamper Output

This voltage free output is connected to the Tamper Connector. These terminals will be shorted when
the tamper switch is closed.

Fault Outputs

Two voltage free fault outputs and LEDs are provided to monitor for External Power Supply (EPS) fault
and Auxiliary Power Supply (APS) fault:

Green LED goes out and Relay contacts open if: Green LED goes out and Relay contacts open if:
AC power fault Battery voltage lower than 10.8V
Unit powered down Unit powered down
Thermal shutdown

Both Relay contacts open and all LEDs out = total power down.

12V Power Output

Terminal blocks are provided to connect to the system. The “Rated Output” current is the maximum
that can be drawn from the PSU’s ‘Power Output’ terminals. This is shown in the ‘Rated Output’
The ‘12V OK’ LED indicates that 12V is available from these terminal blocks.

Auxillary Power Supply (APS) (Batteries

One battery connector is provided marked BATT1.
A battery MUST be fitted to the BATT1 connector.
This power supply is compatible with a 7Ah or 8Ah Sealed Lead Acid Gel battery.

Battery Protection

The battery and electronic circuitry are protected against reverse polarity connection by a self
resetting electronic fuse. The battery is also protected against deep discharge, which will be invoked
when the battery terminal voltage has dropped to 10.8V.


This unit is to be used by service personnel only. There are no user serviceable parts.
No maintenance is required other then routine periodic testing, calibration check and replacement of
the standby battery.
Reference should be made to the battery manufacturer’s documentation to determine typical /
expected battery life with a view to periodic replacement of the battery.

PSU Rating

Power supplies conforming to the new European Standards (ENs) are specified differently from older
designs. The “Rated Output” current is the maximum that can be drawn from the PSU:
a) With a mains supply and a flat standby battery (that is being recharged), and...
b) With no mains supply (battery only).
The Rated Output is shown in the ‘Rated Output’ section.

If the Rated Output is exceded then the Power Supply will no longer meet security Grade 2

Rated Output

1 x 7 Ah battery 0.5 Amps for 12 hours 0.5 Amps for 12 hours
1 x 8 Ah battery 0.5 Amps for 12 hours 0.5 Amps for 12 hours


Product Number CS1520
Applicable Standards Type A, Security Grade 2, Environmental Class 2
AC Input Voltage 230v +10% -15%, 50Hz ± 15%
Output Voltage 13.7v ± 0.1V
Output Ripple < 50mV (0.4% @ 13.6V)
Rated Output See Rated Output table
APS Battery Type 1 x 7Ah or 1 x 8Ah lead acid gel
APS Recharge <24 hours
Operating temp -10oC to +4oC
Case Size 265 x 320 x 100mm
Weight 3.2 Kg


For more information on this and other products please contact CSL Technical Support:
UK Tel: +44 (0)1895 474 444
Ireland Tel: 1800 855 695
Hours: 08.30 to 18.00 weekdays, 10.00 to 16.00 Saturday