Secured direct voltage supply is always necessary when important electrical loads have to be supplied during power cuts with continuous load power.

Our units consist of the components charging-rectifier, battery and distributor. They are always found in the case of loads where safety is an important issue. Examples of this are protective relaying, process control, instrumentation and process control, drive and control technology – in the following fields:

• Power plants
• Transformer stations
• Telecommunications networks
• Chemicals industry
• Steel industry
• Refineries
• Hospitals
• Public transport and railways
• Oil and gas supply
• Shipbuilding

IU-PROFESSIONELL and IU-CONTROL

Operating mode and function

The charging device and the battery work in continuous power supply mode in line with DIN EN 50272-2. This ensures that a high degree of operating safety and reliability is attained with excellent economic efficiency.

In the case of a power cut the battery provides continuous load power over the projected time – and with complete reliability. After the resumption of power supply the charging device automatically supplies the loads while simultaneously recharging the battery.

The SCHORISCH IU-CONTROL and IU -PROFESSIONELL load rectifiers work to the CVCC curve in accordance with DIN 41773.

Selecting components

The SCHORISCH IU-CONTROL and IU-PROFESSIONELL charging-rectifiers and the battery can be selected to match the unit's special parameters:

• charging voltage
• permitted +/- voltage tolerance
• maximum permitted residual ripple
• charging current
• stored energy time
• type of battery (lead-acid, sealed or closed, nickel-cadmium)
• number of cells
• battery recharging time

In the case of low tolerances in the charging voltage the SCHORISCH IU-CONTROL and IU-PROFESSIONELL must be fitted with suitable auxiliary devices as shown in the “Options and special models”.

Standard model

The SCHORISCH IU-CONTROL and IU-PROFESSIONELL unit ranges consist essentially of the following modules:

The following functions are incorporated in SCHORISCH IU-CONTROL and IU-PROFESSIONELL:

The SCHORISCH IU-CONTROL and and IU-PROFESSIONELL perform all necessary monitoring automatically. The relevant measured values, operating state and error reports are shown in clear text on the four-line display and signalled to LEDs or reported via the relay outputs.

Monitoring devices

Current-dependent unit monitoring

The monitoring unit records the malfunctions “DC voltage too high” and “DC voltage too low” as against the unit's nominal current. When “voltage too high” is reported, the mains contactor is disconnected. “Voltage too low” is only reported when the unit's nominal current is <80%. The reports are made via potential-free contacts according to the coded function.

The monitoring unit checks the proper operating state of the battery in connection with the associated charging device. It recognises the following malfunctions:

DC earth-fault monitoring

The earth-fault monitoring measures the resistance between earth and positive pole and between earth and negative pole. If there is a shortfall in the settable response value (ca. 1000 ohms/volts), “DC earth fault” will be reported.

During a capacity test the charging unit voltage is reduced to below the nominal voltage. The present load current is now taken from the battery. The result of the capacity test is calculated and then displayed on the basis of a setpoint/actual value comparison between given battery voltage and test duration. In the case of the IU-PROFESSIONELL the capacity is entered and evaluated as an additional parameter.

If the battery voltage is dropping down during the test, the power supply for the load will be assured by the charging-rectifier and the test will be automatically broken off. A corresponding report will be made.

Short circuit

In the case of a short circuit the unit voltage drops down below to 1.6 V/cell. The unit's power is limited to ca. nominal-current. This makes the unit resistant to a sustained short circuit. “Short circuit” is displayed.

Monitoring of decoupling diode

Decoupling diodes are often used in parallel units. The two possible diode errors – disconnection or fused junction – are recognised and reported by means of suitable measured value recording and special evaluating logic in the IU-PROFESSIONELL.

Options and special models

• Extra smoothing 2% 24/60V 1/2mV
• DC special voltages
• Mains voltage 400 V without neutral conductor
• Mains voltage 3x320 V, 3x500 V, 3x660 V
• Special frequency 60 Hz
• Degree of radio interference”B”
• Automatic counter cell (1-4 stage)
• Main and end-cell technology
• Decoupling diode
• Fuse monitoring
• Ripple monitoring
• Exhaustive discharge protection
• Battery and load fuses D01, D02, LV-HRC
• Automatic circuit breakers
• Fuse switch disconnector(s)
• Test load terminal
• Temperature-dependent charging voltage by means of external sensor
• Integrated test load resistance
• Protection type IP21, IP31, IP40, IP41
• RAL special paint
• Combined casing with battery compartment
• Battery cupboards
• Fan(s)
• Air-discharge ducts
• Oil sumps
• Step plates
• Heated cupboards
  

Further options available on request – please do not hesitate to ask us!