Carel mRack - Default Chapter; Table of Contents

CONTENTS
1.1. General functions ...................................................................................................................................................................................3
1.2 Main characteristics .....................................................................................................................................................................................3
2.1 Buttons - LEDs - Icons..................................................................................................................................................................................5
2.2 LED display and Icons..................................................................................................................................................................................6
3.1. Starting for the first time.......................................................................................................................................................................6
3.2. Unit configuration ..................................................................................................................................................................................6
3.2.1. Input configuration................................................................................................................................................................................7
3.2.2. Unit ON/OFF.........................................................................................................................................................................................7
3.3. Meaning of the inputs / outputs ..........................................................................................................................................................7
3.3.1. Table of analogue inputs........................................................................................................................................................................7
3.3.2. Wiring diagrams: ..................................................................................................................................................................................8
4.1. General settings......................................................................................................................................................................................9
4.2. Compressor rotation..............................................................................................................................................................................9
4.3. Compressor control...............................................................................................................................................................................9
4.4. Number of compressors started with probe 1 fault ......................................................................................................................11
4.5. Compressors with different capacities.............................................................................................................................................11
4.5.1. Proportional band control with different capacity compressors .................................................................................................................11
4.5.2. Dead band control with different capacity compressors...........................................................................................................................11
4.5.3. Example of compressors with different capacities...................................................................................................................................11
4.6. Manually enable/disable the compressors......................................................................................................................................12
4.7. Special MT-LT units .............................................................................................................................................................................12
4.7.1. Management of compressor racks with LT and MT circuits and condenser only. ........................................................................................12
4.7.2. Probes and values controlled................................................................................................................................................................12
4.8. Compressor time settings ..................................................................................................................................................................13
5.1. Fan management .................................................................................................................................................................................14
5.1.1. Fan control.........................................................................................................................................................................................14
5.2. Dead band control ...............................................................................................................................................................................14
5.2.1. 5.1.2 Fan rotation ...............................................................................................................................................................................14
5.3. Inverter management..........................................................................................................................................................................15
5.4. PWM-PPM management.....................................................................................................................................................................17
5.5. Floating condenser control ................................................................................................................................................................17
6.1. Manual device operation ....................................................................................................................................................................18
6.2. Compressor hour counter and maintenance alarm ......................................................................................................................18
6.3. Set point variation from digital input................................................................................................................................................18
6.4. Type of refrigerant ...............................................................................................................................................................................18
6.5. Auxiliary probe management ............................................................................................................................................................18
6.6. Prevent high discharge pressure ......................................................................................................................................................18
1. Product ......................................................................................................................................................................................................................................3
2
User interface
4
3. Starting the unit .....................................................................................................................................................................................................................6
4. Compressor management.................................................................................................................................................................................................9
5. Fan and inverter management ...................................................................................................................................................................................... 14
6. Various settings ...................................................................................................................................................................................................................18