(5), the switching arrangement (10), when having a power failure, when supervisory unit (11) and the change pulse which put out change pulse are received the bypass doing the transformer (22), has had with the switch unit (relay 16) which makes lamp wiring connect (24) with electric ...
Since during a start oil pressure has not built up, a timer, T1 is introduced to bypass the trip interlock and avoid a false trip. A relay (contactor), d1, is used to provide lube oil pressure interlock. Fuel oil solenoid valve (SV) This is to cut off the fuel supply to the ...
An electronic ballast system is intended to operate one or more fluorescent lamps and a subsystem with universal input from 108V to 305V, a battery, and battery charger, associated logic, and a provision for emergency lighting, as well as for operating at least one of any combination of fluo...
The ZigBee chip can receive data from a photodiode and control a light emitter (such as LED array or light bulb) to provide night lighting in one option. This embodiment can also optionally harvest solar energy to charge the device when light is available. A combination of active and ...
An emergency lighting device for controlling a lighting means includes an energy store, such as a battery or an accumulator, a charging circuit for the energy store having connectio
If switch 1 is turned off, a small current passes through bypass element 15 which results in insufficient power being transmitted through transformer T1 to charge battery B1, but sufficient power to continue to maintain transistor TR2 conductive. If the mains fails with the switch 1 in the OFF...
Relay unit to bypass the AC input power; High voltage power supply to a high voltage step-up to the backup power; And wherein the step-up high voltage inverter section for converting a commercial frequency, and the AC voltage; characterized in that it comprises a ; According to the present...
1. An emergency lighting arrangement configured to be connected to a supply network and utilized in connection with a fluorescent lamp, the emergency lighting comprising an electronic ballast for igniting and burning the fluorescent lamp, the electronic ballast being a controllably dimmable ballast, and...
which is typically 20 milliseconds for the relay K1. During the operation that provides for the emergency lighting, to avoid the battery from completely discharging so as to provide for a prolonged blackout, the emergency section of FIG. 5 utilizes a battery sensor circuit integrated in the half...
When a fluorescent lamp FL is detected not to be lighted by a lighting detecting means 5, a control means 4 closes a switch SW1 to increase a base current of each transistor Q1, Q2 by flowing a current to bypass a resistor R4. An output of the inverter 3 is increased to light the ...