• 10" touch screen
• Analogue display instruments
• MODBUS, IEC 61850 and many more
• Battery cabinets / distribution cabinets
• Internal and external countercells
• External battery connection boxes (opt. Ex-d / Ex-de types)
• Decoupling diodes
• Ground fault monitoring
• Parallel operation with and without active load sharing

The service life of lead-acid and nickel-cadmium batteries can be maximised if they are at rest in a charged state. This resting state of the batteries is achieved when the rectifier unit takes over the load supply and the battery is only stressed in the event of a mains failure or a large shock load. This operating mode is called Standby parallel operation.

In the event of a mains supply failure, the battery system takes over the supply of the connected loads without interruption. When the mains power returns, the battery is automatically recharged.

If the battery is very heavily discharged, the rectifier first operates in the I-branch of the IU characteristic curve, where the charging current is the difference between the nominal current of the rectifier and the current load.

When the set output voltage is reached, the transition to constant voltage charging (U-branch) takes place.

Accelerated recharging is achieved by switching the characteristic curve from float charging (e.g. 2.23 V / Z for lead batteries) to charging (e.g. 2.4 V / Z for lead batteries).

After the battery is fully chargedit will still draw the float charge current, which is between 0.3 mA and 1 mA per 1 Ah of battery capacity.

The output voltage is kept constant with a deviation of ± 0.5 % within a load range of 0 % to 100 % of the unit current.

Mains voltage fluctuations of ± 10 % and mains frequency fluctuations of ± 5 % are compensated.

The battery circuit of the power supply system can be tested in a set cycle. This can be activated in the menu. For this purpose, the rectifier output voltage is lowered to an adjustable value, e.g. 1.9 V / cell for a short period of time. This minimally discharges the battery for a short time.

At the same time, the battery voltage is checked. If it remains above the set value, the battery circuit is OK. If it falls below the limit value, the message "Battery circuit fault" is displayed and the LED and common alarm relays are activated.

In the battery capacity test, as in the battery circuit test, the rectifier output voltage is lowered and the battery is discharged with a constant current. During this test, the voltage and current time curves are recorded and compared against the manufacturer's data sheet values. The results of this test include the remaining capacity of the battery system and the resulting remaining running indication at current load.
If the set marginal parameters are violated during this test, the corresponding LED and the collective fault signal relay indicate the faulty test procedure. After the test has been completed, the rectifier unit automatically switches back to charging or float charging.

Alternatively, the current battery condition can be validated by a partial discharge with the load current that is currently applied.

The voltage drop on the line between the rectifier and the battery can be compensated by entering the line length and the line cross-section. This ensures that the battery system is supplied with the correct voltage even if the battery connection cables are long.

If the battery voltage drops due to a mains failure or another circumstance to an extent that the rectifier unit operates in current limitation for longer than 30 seconds after charging has started, the system automatically switches to the boost charging characteristic. After the charging voltage (voltage limit) is reached and the current drops below 90%, a time stage is activated. After the set time (0 to 48 hours) has elapsed, the system automatically switches back to float charge.

The automatic charging function is adjustable and can be activated or deactivated as required.
A manual boost charge, a manual switchover and a float charge can all be activated at any time from the unit's display.

The switchover to charging can be blocked by an external contact or a fixed jumper on the controller (e.g. external hydrogen sensor in the battery room).

Alternatively, a manual selector switch for charging / float charging is offered as an option.

Equalising charging can be switched on from the display. To do so, the voltage value and the current limitation can be set on the display.
Please note that before activating this operating mode, check your loads for the set voltage value and disconnect them if necessary to avoid damaging them with the high voltage.

When equalising charge is switched on, a timer is started which automatically switches back to float charge after the programmed time (0 - 48 hrs) has elapsed. The switchover to equalising charge can be blocked by an external contact or a fixed jumper on the controller.

When several rectifiers are connected in parallel in conjunction with the parallel run option, the load is distributed symmetrically to all rectifiers that are connected and switched on.
Without the parallel run option, load sharing is largely determined by line impedances.
The use of decoupling diodes with rectifiers connected in parallel is recommended.