Reo Elektronik REOTRON MEW, Руководство по эксплуатации

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Operating Instructions
REOTRON MEW
REO
UK LTD 5
ELEKTRONIK
ELEKTRONIK ELEKTRONIK
ELEKTRONIK
2.1 Effective Current Value
The effective current value is measured inside the unit through a current transformer and a burden
resistor. The internal microprocessor determines the effective value of the output current and adjusts
this using a PI regulator.
2.2 Effective Voltage Value
The effective voltage value is also measured internally using a voltage transformer and the effective
value is controlled by the microprocessor using a PI regulator.
2.3 Current Regulator
Microprocessor controller with PI Characteristics; the P portion is adjustable externally by using
trimmer P4. The units maximum output current (Rated Current) is factory set. If the thyristor controller
is to be adapted for a small load current, then a correction can be made by using trimmer Imax.
BEWARE : It is possible to obtain an output current which is higher than the rated current because of
component and manufacturing tolerances, however, for safety, it is essential that the current limit is
not set higher than the rated current
In current regulation mode the LED Imax is permanently illuminated.
2.4 Voltage Regulator
Microprocessor controller with PI Characteristics; the P portion is adjustable externally by using
trimmer P3. The units maximum voltage output is factory set to the rated voltage (for 100% set point).
Therefore, the setpoint cannot be fully used during voltage regulation since this would not allow for
any over voltage. In this operating mode (voltage regulation) either the setpoint must be limited or the
maximum unit output voltage must be reduced by using the trimmer Umax.
2.5 Pulse Generation
The pulses required for the control of the thyristors are generated by the microprocessor and are fed
to amplifiers prior to the pulse conductors. The secondary windings of the pulse conductors directly
control the thyristors.
2.6 Temperature Monitoring
A temperature switch is fitted into the heat sink to monitor its temperature and this switches off the
thyristor controller, permanently, if the temperature exceeds a maximum of 80oC. Fault indication is
provided by the general fault relay and displayed by the LED on the front panel.
3.0 Control Inputs and Outputs
Control Inputs
Setpoint Input U 0(4)...20 mA, 0-10V DC or Potentiometer 10k
Ω
Setpoint Input I 0(4)...20 mA, 0-10V DC or Potentiometer 10k
Ω
Enable 12-24V DC or contacts
Outputs:
Effective Current Value 0-10V DC corresponding to 0-100% (Option)
Effective Voltage Value 0-10V DC corresponding to 0-100% (Option)
Fault Indication Relay Contact 250V/1A (Change over)