Specification / Technical Information

Installation
The external test switch requires a 7mm mounting hole and needs to be accessible for initial programming, manual tests and clock resetting. The monitor LED bezel requires a 6.25mm mounting hole and should always be visible with the luminaire in its installed condition. The lamp sensor needs to be located adjacent to and pointing at the emergency lamp.

Wiring
The screw terminal connections to the DST™ unit are suitable for wires up to 1.5mm diameter. Wiring connections between the batteries and the DST™ unit need to be kept as short as possible to reduce Voltage drops.

Commissioning & Testing
24 hours after initial power-up, the DST™ enters a battery preconditioning phase. If the battery charge allows less than 5 minutes ofemergency operation a fault indication will occur. The test is repeated 24 hours later and if less than 1 hour of emergency operation occurs, a fault indication will be given. 60 hours after initial power up, the DST™ exits the battery-conditioning mode and commences the test regime with a 5 minute monthly test.

At any time a momentary push on the test switch will invoke a 12 second functional test, which is indicated by the monitoring LED changing to red, accompanied by a single bleep from the internal sounder (if enabled).

To reset the internal clock and thus restart the test timing cycle, the test button needs to be pushed and held in for at least 5 seconds. A successful clock reset is indicated by a double bleep from the sounder. Following a clock reset the DST™ unit will re-enter the battery preconditioning phase.

DST™ units incorporate a sounder, which can be muted by removing the black shorting link located below the test switch and sensor terminals.

Further technical information is available from our technical department at [email protected]