TUL 500EN is the additional 27,6 V 5 A power supply created to ensure autonomy to fire detection systems and smoke and heat evacuation and control systems (SHE). It is composed of a foldback current limited switching power supply, a microcontroller supervisory circuit and auto-reset electronic fuses. Constant monitoring of the functions and failure notification in case of: interrupted fuses – high battery charge voltage – low battery voltage – mains failure and missing battery recharge – disconnected battery – high battery resistance. Failure notifications can be seen on the LEDs of the front panel and are signaled by dry relay contacts. The device has 1 output for battery recharge and 3 independent outputs. Protection against polarity inversion and short circuits. Battery recharge circuit is temperature compensated.
Electronic fuses for outputs protection. In the event of output- or battery short circuit, or in case of disconnected battery, the power supply is nevertheless able to supply current.