Systems which are required to perform safe and reliable signalling operations must also guarantee continued operation in the event of a power failure. Facilities which are powered by batteries in such an event are required to carry out optimum battery maintenance during normal operations. The Digitrans battery charging rectifier fulfils this task.

The technical data

Facilities:

• 700 watt battery charging current for parallel charging according to the principle of the primary switched-mode power supply unit (switching frequency 100 kHz). This results in a compact design, low weight and high efficiency (typ. 85%).
• Control of the temperature-dependent charging characteristics is carried out by the microcontroller, which reads in the voltage, current and temperature values via an analogue/digital converter.
• An LCD display indicates the current and voltage values and guides the user in entering control characteristics. The data is entered via a decimal keyboard.

Further details:

• Adjustable trickle charge, gassing and 2 V characteristic voltage
• Adjustable limit for maximum current
• Adjustable charging time for gassing voltage
• Battery voltage also displayed in case of power failure
• Power failure counter
• Temperature display
• Fuse failure display
• Alarm output via relays
• Several Digitrans can be cascaded when higher power requirements apply

Charging characteristics

• Charging voltages as a function of temperature
• Voltage and current characteristic as a function of time

t ein = Activation time for LC system

t aus = Deactivation time for LC system

Ugs = Gassing voltage

Ulh = Trickle voltage

U2v = 2 V characteristic voltage