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Related Manuals for WELBA MPR-M
Summary of Contents for WELBA MPR-M
- Page 1 WELBA Microprocessor regulator type MPR-M Installation and operating instructions for plant engineering companies WELBA GmbH Phone: +49 (0)2638 / 9320-0 Electronic Control Engineering Fax: +49 (0)2638 / 9320-20 Gewerbepark Siebenmorgen 6 E-mail: info@welba.de D-53547 Breitscheid Net: www.welba.de...
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Page 2: Table Of Contents
Independently of this, a short or longer period of intermittent stirring can be set. If required, a MPR-M model is also available with constant stirring, where the stirrer is turned on or off by push button. -
Page 3: Intended Use
Please read carefully before installation and before any work on or with the regulator. The electronic milk-cooling thermostat type MPR-M is used to control the stirrer motors and cooling compressors of milk-cooling systems. Any other use of the device is permissible only with the manufacturer's written consent. -
Page 4: Installation
"Setting the actual value correction" on page 16. Observe the permitted temperature range to which the sensor is suited: Sensor cable temperature range °C PVC (standard) -30° to + 70 ° Silicon -50° to +180° Page 4 MPR-M 26.01.21... - Page 5 If an external button or selection switch is connected, parameter [P80] or [P81] must be set as appropriate at configuration level. Caution: do not connect external voltage to the "S/S" or "T/T" terminals. Buttons or selection switches used must be designed as potential-free make contacts. Page 5 MPR-M 26.01.21...
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Page 6: Housing Dimensions And Technical Data Thermostat
6.0 mm +/- 0.1 Cable material - PVC (standard) 40 mm - Silicon (special model) Measurement range KTY 81-210 - Cable PVC -30 .. 70° C - Cable Silikon -50 .. 150° C Cable lenght standard 2 metres Page 6 MPR-M 26.01.21... -
Page 7: Operation
0° Should the milk temperature exceed the selected target temperature (T1 or T2) by the hysteresis value, the compressor and stirrer are automatically switched on again. Page 7 MPR-M 26.01.21... -
Page 8: Parameter Settings In General
Switch target temperature from T1 to T2, or from T2 to T1 Changing the target temperature is Press button together with button SET = possible only when the button lock in the programming level [C99] is -adjust the current target temperature downwards set to "0". Page 8 MPR-M 26.01.21... -
Page 9: Programming Level Operation
Alteration of the target temperatures in the working level can be To switch back to the working level: Press for 5 seconds simultaneously blocked by setting the button lock. (Switches back automatically after 30 seconds.) 0 = lock off 1 = lock on Page 9 MPR-M 26.01.21... -
Page 10: Configuration Level Operation
Parameter P23: Limit for target temp. T2 upwards To switch back to the working level: Setting of input limits for target temperatures at working and Press for 5 seconds simultaneously programming levels. (Switches back automatically after 30 seconds.) Range: -10 .. 50°C Page 10 MPR-M 26.01.21... - Page 11 1 = with button (standard, activate with button "Agitator") 2 = with external push button 3 = permanent stirring ON / OFF Parameter P99: temperature scale To switch the display between degrees Fahrenheit and degrees Celsius. 0 = Celsius 1 = Fahrenheit Page 11 MPR-M 26.01.21...
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Page 12: Intermediate Stirring Options During Cooling
The same button functions apply as in the case of option a. Parameter [P81] is set to 3: On request the MPR-M can be set for "continuous stirring", i.e. the agitator can be switched on and off by pressing a button. -
Page 13: Setting The Actual Value Correction
Parameter [C91] "Actual value correction" must then be adjusted at programming level. Memory fault: Faulty regulator! Remove the regulator and send it for repair. Measurement range exceeded: The maximum measurement range of the sensor has been exceeded. Page 13 MPR-M 26.01.21... -
Page 14: General Measures When Using Electronic Control Systems
Possible interference sources (to name but a few) include: bouncing contacts when switching loads switching off inductive loads (contactors, motors, solenoid valves, etc.) unsatisfactory routing of wires, too small cross-sections loose contacts rhythmically changing power stages (power converters) power breakers high-frequency generators Page 14 MPR-M 26.01.21... - Page 15 RC combination even when the switching contact is open. This current may be enough to mean that a downstream contactor is not de-energised and a closed protective contact does not reopen. Page 15 MPR-M 26.01.21...
- Page 16 The suggested measures have the advantage that they will increase the lifetime of the devices, as lower induction voltages (redu- ced spark formation) will also reduce contact burn. Page 16 MPR-M 26.01.21...
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