Summary of Contents for WELBA MRF-M
- Page 1 Measuring - Controlling - Regulating All from the same source welba.de Milk temperature controller MRF-M Firmware V2.2 Installation and operating instructions for plant engineering companies...
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Page 2: Table Of Contents
Fault indication on the display ......Page 15 General measures when using electronic control systems ..Page 16 Page 2 MRF-M 24.01.2025... -
Page 3: Function
Independently of this, short or long "intermediate stirring" can be selected by pressing a button. Software can aIso be used to programme the MRF-M for "permanent stirring", i.e. the agitator is switched on and off by pressing a button. Cooling mode: Press the button cooling: the compressor and agitator operate automati- cally. -
Page 4: Intended Use
Please read carefully before installation and before any work on or with the regulator. The microprocessor-controlled regulator type MRF-M is used to control heating and cooling systerns, alarm devices, fans, etc. Any other use of the device is permitted only with prior written permission from the manufacturer. -
Page 5: Installation
(or if a sensor other than the one supplied is to be fitted), the "actual value correction" parameter must be adjusted accordingly. See the section "Setting the actual value correction" on page 15. Page 5 MRF-M 24.01.2025... -
Page 6: Electrical Connection
The cooling compressor switches on as a function of the milk tem- perature. Electrical connections must be as shown in the diagram below. Use cable bushes. L1 N L1 C S Make sure that cables cannot chafe. Operating voltage Page 6 MRF-M 24.01.2025... -
Page 7: Technical Data Regulator
Sensor dimensions and technical data Sensor element PT-1000 Bush material 1.4301(V2A) Bush length 40 mm Bush diameter 6.0 mm +/- 0.1 40 mm Cable material Measurement range -10 .. 70° C Cable lenght Standard 2 metres Page 7 MRF-M 24.01.2025... -
Page 8: Operation
T2 temperature throughout the milk. 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 8 MRF-M 24.01.2025... -
Page 9: Parameter Settings In General
Switching back to working level: (possible from any parameter) Press up-arrow and down-arrow simultaneously for approx. 5 seconds. If, at programming or configuration level, no buttons are pressed for approx. 1 minute, the regulator switches back to working level automatically. Page 9 MRF-M 24.01.2025... -
Page 10: Working Level Operation
"0". - if flashing: start delay is active. LED 7 "T1" - zeigt an, shows that target temperature setting "T1" is active LED 8 "T2" - zeigt an, shows that target temperature setting "T2" is active Page 10 MRF-M 24.01.2025... -
Page 11: Programming Level Operation
Alteration of the target temperatures in the working level can be To switch back to the working level: blocked by setting the button lock. Press for 5 seconds simultaneously (Switches back automatically after 30 seconds.) 0 = lock off, 1 = lock on Page 11 MRF-M 24.01.2025... -
Page 12: Configuration Level Operation
Parameter P33: Limit for hysteresis T2 upwards sensor type Setting of input limits for hysteresis at programming level. To switch back to the working level: Range: 0,1 .. 30 K Press for 5 seconds simultaneously (Switches back automatically after 30 seconds.) Page 12 MRF-M 24.01.2025... - Page 13 Setting of funktion: "start manual intermittend stirring". See section "Intermediate stirring options during cooling" - page 14. 0 = not possible (intermittend stirring not possible) 1 = with button (standard, activate with button "Agitator") 2 = permanent stirring ON / OFF Page 13 MRF-M 24.01.2025...
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Page 14: Intermediate Stirring Options During Cooling
[c50] and [c51]. Parameter [P81] is set to 2: On request the MRF-M can be set for "continuous stirring", i.e. the agitator can be switched on and off by pressing a button. When the agitator is switched on or off, the display briefly indicates "ON"... -
Page 15: Setting The Actual Value Correction
Press and hold the SET button until "dEF" appears in the display: The standard configuration (factory setting) has been restored. Press the SET button again to confirm the factory reset. Reset the original parameterization for the tank and save it. Page 15 MRF-M 24.01.2025... -
Page 16: 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 16 MRF-M 24.01.2025... - Page 17 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 17 MRF-M 24.01.2025...
- Page 18 The suggested measures have the advantage that they will increase the lifetime of the devices, as lower induction voltages (re- duced spark formation) will also reduce contact burn. Page 18 MRF-M 24.01.2025...
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