Ignition and Control Device
DESCRIPTION
The control devices of the REOTRON MDZ2000 series are microprocessor-controlled devices for controlling power thyristors in 6-pulse rectifier systems. The devices include the control and regulation electronics as well as the ignition pulse generation and the ignition pulse output stages.
The rectifier can be operated as a current regulator or voltage regulator, with an automatic switchover to the smaller setpoint. The required setpoints can be specified by external potentiometers, control signals 0…10 V, DC or 0…20 mA / 4…20 mA DC or via the integrated control display. The actual value inputs are standardly designed for +/- 0…40 V rectifier output voltage and +/- 0…75 mV output current, but 0…10 V, DC normalized input signals are also possible.
Function
The REOTRON MDZ control and ignition devices are designed for controlling rectifier systems. They contain one controller each for current and voltage regulation.
In voltage regulation mode, the output voltage specified by the setpoint is kept constant by an internal control loop, so load changes or mains voltage fluctuations have no influence on the output voltage. If the device is operated as a current regulator, the output current of the device is compared with the setpoint and the device output is regulated accordingly. The output voltage can rise up to the maximum value. Reaching the limit values Imax and control limit is indicated by LEDs. If both setpoints are used during operation, the controller with the smaller setpoint always has priority. This means that, for example, in voltage regulation with underlying current regulation, the voltage regulator is active as long as the permitted current value is not exceeded. If the current limit is reached, the current regulator has priority. If the device is to operate as a pure voltage or current regulator, the other setpoint input must be bridged to the reference voltage (10 V, DC).
ADVANTAGES
- Use as three-phase thyristor controller or fully controlled three-phase bridge
- Connection to clockwise or counterclockwise rotating field possible (self-detecting)
- Current or voltage regulation
- Selection option for transformer vector group
- Switchable to controller operation without control functions
- External setpoint specification
- Input for overtemperature switch
- Fault indication
- Usable as three-phase thyristor controller with downstream transformer and passive bridge rectifier
| Device type | REOTRON MDZ 2000 |
| Mains connection | 3x 400 V +6%-10% 50/60 Hz |
| Ignition pulse stages | 6 |
| Pulse voltage | approx. 12 V |
| Pulse current | 500 mA |
| Transformer vector groups | Dd0, Yy0, Dz0, Dy5, Yd5, Yz5,Dd6, Yy6, Dz6, Dy11, Yd11, Yz11 and Primary controller |
| Voltage setpoint | 0…10 V, DC / 0…20 mA / 4…20 mA / Pot 10 kΩ |
| Current setpoint | 0…10 V, DC / 0…20 mA / 4…20 mA / Pot 10 kΩ |
| Actual value input voltage | +/- 0…40 V (0…10 V, DC option) |
| Actual value input current | +/- 0…100 mV (0…10 V, DC option) |
| Ramp-up/down integrator | 0.1…10 seconds adjustable |
| Voltage controller | PI controller P-component adjustable |
| Current controller | PI controller P-component adjustable |
| Input impedance actual value input voltage | 56 kΩ |
| Input impedance actual value input current | 5.6 Ω |
| Control signal pulse enable | 12…24 V, DC / 2.5 mA |
| Control signal setpoint lock | 12…24 V, DC / 2.5 mA |
| Overtemperature input | Switch 1 mA |
| Fault relay | 1 changeover contact load 250 V, 1 A |
| Status relay | 1 changeover contact load 250 V, 1 A |
| Permissible Ambient temperature | 0…45 °C |
| Dimensions (WxHxD) | 140x290x160 mm |
