Installation and Operating Manual
Automatic Charger VAC 1215/15 DUO ( I=12V/15A und II=12V/15A ) No. 0626
Automatic Charger VAC 1215/30 DUO ( I=12V/15A und II=12V/30A ) No. 0627
Automatic Charger VAC 1220/20 DUO ( I=12V/20A und II=12V/20A ) No. 0629
Automatic Charger VAC 1220/30 DUO ( I=12V/20A und II=12V/30A ) No. 0631
Automatic Charger VAC 1215/40 DUO ( I=12V/15A und II=12V/40A ) No. 0636
Automatic Charger VAC 1220/40 DUO ( I=12V/20A und II=12V/40A ) No. 0634
Automatic Charger VAC 1230/30 DUO ( I=12V/30A und II=12V/30A ) No. 0642
Automatic Charger VAC 1230/40 DUO ( I=12V/30A und II=12V/40A ) No. 0644
All-automatic dual charger with 2 completely independent battery circuits for ambulance cars,
intervention vehicles and special purpose vehicles.
If not connected to the battery the units will not supply any voltage (protection against
reverse battery, safety relay, minimum battery voltage 1.0 V)!
Please read the mounting instructions and operating manual including the safety
regulations completely prior to starting connection and start-up.
The description is identical for both chargers.
VOTRONIC dual chargers of series “VAC DUO” distinguish by their compact design, low weight (high-frequency
switching power supply, Switch Mode Technology), as well as full charging capacity - even in case of large
deviations in the power supply (low voltage/overvoltage, sine curve, frequency).
The intelligent microprocessor charging control with characteristic lines of charging „IU1oU2“ and dynamic
charging time calculation ensures automatic, quick and gentle full charging, as well as subsequent 100 % trickle
charge of the connected batteries from any initial charging state. At the same time, simultaneous supply of 12 V
consumers, which are connected in parallel, is ensured or charging of very large batteries (depending on case of
application).
Operating Instructions:
All-automatic Continuous Operation: The charger may be connected continuously to the batteries, thus
keeping the full charge. Battery discharge in case of power failure is avoided (integrated safety relays).
The charging voltage being free from peaks is controlled in such a way, that any overcharging of the batteries
is excluded.
Parallel and Floating Operation: In case of simultaneous current consumption by consumers, charging of the
battery is continued or the charge will be conserved fully. Calculation and control of the adaptation of the
charging time is effected automatically by the charger. Sensitive consumers are protected by overvoltage
protection at any charging state.
Unattended Charging: Multiple protection against overload, overheating, overvoltage, short circuit, reverse
battery, excess temperature of the battery, incorrect behaviour and back discharge of battery by electronically
controlled gradual reduction down to complete separation of charger and battery by integrated safety relays.
Temperature Compensation: Automatic adaptation of the characteristic line of charging to the battery
temperature.
Integrated On-board Mains Suppression Filter: Unproblematic parallel operation of solar systems, dynamos,
generators etc.
Charging Cable Compensation: Automatic compensation of voltage losses on the charging cables.
Measurement of the voltage is to be effected at the battery and never at the charger (losses at the charging
cable).
Battery regeneration in case of extended stop periods: twice a week to avoid harmful acid accumulation.
Port +86 for motor lock while the vehicle is still connected to mains
Interruption or restart of the charging process: Due to power failure or unit switch OFF.
In case of frequent interruptions, particularly before reaching the full charge ("Battery Full" is lighting
permanently), a complete charging cycle of 24 hours of the battery should be executed more often
(compensation charging).