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Phone: (

888) 289-7299

Email: [email protected]

10 |

P a g e

MCS – MicroMag Error / Alarm Manual

Version: 02/21/2020

This alarm will trip if the discharge pressure
drops below the value of Setpoint #69. If the
compressor has low discharge pressure, it will
lockout and display the LO DIS PSI alarm.

Note: Supervisor password (2112) is

required to reset lockouts

MicroMag Alarms

Possible Causes

Solutions

Sensor fault on

discharge pressure

See Appendix B to troubleshoot

Condenser fans not

cycling properly

Check Setpoint #17 to ensure enough head pressure is being built

Flooded head pressure

controls (Receivers

only)

Adjust the ORI valve (shown to the right) for a

higher receiver pressure setting

Refrigerant charge is

low

Check for refrigerant leak

Contact Drake to determine the charge

Low Discharge
Pressure

4

.

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Summary of Contents for MCS-MicroMag

Page 1: ...www drakechillers com 2900 Samuel Drive Bensalem PA 19020 888 289 7299 215 638 5515 MCS MicroMag Error Alarm Manual ...

Page 2: ...This page intentionally left blank ...

Page 3: ... 6 PUMP ONLY 6 Alarms 7 Supply Freeze 7 Low Suction Superheat 8 High Discharge Pressure 9 Low Discharge Pressure 10 Low Unsafe Suction Pressure 11 No Flow 12 Phase Loss 13 No Battery 14 Sensor Fault 15 Appendices 16 Appendix A Cooling States 16 Appendix B Diagnosing Sensor Errors 17 Appendix C Phase Monitor Faults 21 Appendix D Enter Password and Enable Run Stop 23 Appendix E Change Date Time 25 T...

Page 4: ...er v Laptop for in depth diagnostics using MCS Connect vi An RS 485 to USB cable shipped in the manilla folder with the chiller b Check all fuses c Check fluids i Verify freeze point ii Check tank level d Make sure unit is correctly wired and receiving power matching that found on the data tag 2 For component locations refer to the included wiring and piping diagrams WARNING Make sure to shut down...

Page 5: ...bility Alarm lockouts for chiller protection Automatic compressor lead lag on dual circuit chillers Basic chiller functionality for easy setup and operation Custom factory configurations o Programmable for VFDs o Programmable for EC fans Two RS 845 serial communication ports Can communicate with Modbus RTU or BACnet MSTP Wet contact supply for field installed Run Stop switch Dry contact for alarm ...

Page 6: ...ge pressure and superheat monitoring o Monitors compressor runtime and cycles per day Data logging capabilities setpoint changes and sensor calibration Alarm history of previous 99 alarms and events Capable of extracting data from the last 90 minutes of runtime Password authorization for setpoint changes NEMA4 gasket seal for extreme weather protection Note Any and all changes modifications and al...

Page 7: ... in which all Relay Outputs are shut off and ensures the board is receiving stable power When the unit is shut off due to a user set schedule the unit displays this status In this state all relays are disabled and their statuses will read OFF The schedule can be viewed or modified in the Service Tools menu PowerUpDelay 1 OFF SCHEDULE MicroMag Unit States 2 ...

Page 8: ...re disabled and their statuses will read OFF To enable the Run Stop refer to Appendix D When the fluid inlet or outlet temperature sensor reads a value higher than the value of Setpoint 8 CWIN OUT Target the unit displays this state and is starting to or is currently running in order to drop the fluid temp below the setpoint For cooling sub states refer to Appendix A MicroMag Unit States OFF RUN S...

Page 9: ...be reset from the keypad or with the MCS Connect program however if the lockout condition has not been corrected the system will again be forced into this state Note If the Lockout Reset is used more than 6 times in one day the unit cannot be reset except with Factory authorization Call Drake for support This state is entered when all compressors have been shut down either due to normal operating ...

Page 10: ... incorrect for operating conditions Change setpoint to a lower value IMPORTANT If supply fluid is water do NOT change setpoint to a value lower than 40 F 4 5 C as the liquid may freeze and cause severe damage to the chiller Ambient temperature is cold enough to affect fluid temperatures Verify insulation thickness is suitable for the lowest ambient operating temperature Add more glycol to lower fr...

Page 11: ...nutes but another trip within the next hour will result in a lockout Note Supervisor password 2112 is required to reset lockouts MicroMag Alarms Possible Causes Solutions Sensor fault on suction pressure or temperature See Appendix B to troubleshoot Lack of a load Verify the chiller has a heat load Lack of fluid flow Confirm active flow to the chiller Ensure y strainer shown to the right and proce...

Page 12: ...ser panels removed Replace the panels on the chiller Condenser dirty or damaged Air cooled Clean or replace condenser coils shown to the right Condenser blocked Air cooled Poor installation location overhang other equipment installed too close wall fence or other object is within 3 of the chiller blocking airflow Fans not running Air cooled Verify fuses are not blown left picture Carefully with ON...

Page 13: ...Supervisor password 2112 is required to reset lockouts MicroMag Alarms Possible Causes Solutions Sensor fault on discharge pressure See Appendix B to troubleshoot Condenser fans not cycling properly Check Setpoint 17 to ensure enough head pressure is being built Flooded head pressure controls Receivers only Adjust the ORI valve shown to the right for a higher receiver pressure setting Refrigerant ...

Page 14: ... fault on suction pressure See Appendix B to troubleshoot Liquid line blocked restricted Check that all valves are open between the condenser and TXV and that filter dryer shown to the right is not blocked Ensure TXV is opening and is set properly Lack of load flow Ensure y strainer shown to the right and process plumbing are free of blockages or restrictions and that all ball valves are opened En...

Page 15: ...tch top photo is out of adjustment Isolate then remove from the pipe and clean sensor Air is present in the chilled fluid lines Purge air from the system No fluid in the tank or low fluid levels Ensure y strainer bottom photo and process plumbing are free of blockages or restrictions and that all ball valves are opened Check for a loose wire on flow sensor terminal block and check that MicroMag is...

Page 16: ...s Problem with 24VAC Check transformer output to make sure it is outputting 24VAC to the phase monitor If not make sure the transformer inputs are set up for the correct line voltage Verify that all wires are connected securely to the transformer and to the phase monitor Check for any blown fuses left photo Problem with 5VDC MicroMag output Ensure MicroMag is outputting 5VDC from the sensor termin...

Page 17: ...ery has run dry or if it has been removed Note Supervisor password 2112 is required to reset lockouts MicroMag Alarms Possible Causes Solutions Battery on MicroMag missing or depleted Reinstall or replace the battery location shown to the right BR2032 or CR2032 coin cell battery Time and date are inaccurate Adjust the date and time see Appendix E No Battery 8 ...

Page 18: ...r a sensor input is not receiving any feedback from its sensor If a sensor or wire is disconnected from the MicroMag the input will read 99 9 and if a sensor is shorted it will read 999 9 Note Supervisor password 2112 is required to reset lockouts MicroMag Alarms Possible Causes Solutions Sensor fault See Appendix B to troubleshoot Sensor Fault 9 ...

Page 19: ...one and loading ROC HOLDING BZ We are below the zone and holding ROC UNLOADING IZ We are in the zone and unloading ROC LOADING IZ We are in the zone and loading ROC HOLDING IZ We are in the zone and holding normal UNLD ROC We are unloading based on ROC LOAD ROC We are loading based on ROC HOLD ROC We are holding based on ROC OFF READY The cooling is off but ready to run DISABLED The cooling is dis...

Page 20: ...putting 5VDC at the 5 sensor input port measured between 5 and c Make sure sensor is set to analog A 3 Check for loose wire on sensor terminal block of MicroMag and verify wiring is in the correct sequence see Sensor Wiring section on page 19 4 Check the sensor cable for any signs of damage 5 Ensure sensor harness is securely connected to pressure transducer 6 Verify that pressure sensor is comple...

Page 21: ... 9 shorted wire jump to step 2b 2 Verify sensor accuracy a Verify sensor with temperature probe b Ensure the MicroMag is outputting 5VDC at the 5 sensor input port measured between 5 and c Make sure sensor is set to analog A 3 Check for loose wire on sensor terminal block of MicroMag and verify wiring is in the correct sequence see Sensor Wiring section on page 19 4 Check the sensor cable for any ...

Page 22: ...mail drakeservice drakechillers com 19 P a g e MCS MicroMag Error Alarm Manual Version 02 21 2020 Appendix B Sensor Locations Discharge Pressure Transducer Suction Temperature Sensor Flow Switch Suction Pressure Transducer ...

Page 23: ... P a g e MCS MicroMag Error Alarm Manual Version 02 21 2020 Appendix B Sensor Wiring Flow Switch Wiring Diagram Temperature Sensor Wiring Diagram Pressure Transducer Wiring Diagram Example Sensor Wiring Pressure Transducer Shielding Wire Silver Shielding Wire ...

Page 24: ...lance Voltage unbalance between load phases 1 Press the READ button to observe the present load voltages Check system for unbalance cause 2 Increase the fault interrogation time if necessary 3 Increase the percent unbalance setting if necessary Front Over Voltage Average phase voltage above maximum 1 Check system for over voltage cause 2 Increase the percent over voltage setting if necessary 3 Inc...

Page 25: ...power Front Phase Unbalance Voltage unbalance between phases 1 Press the READ button to observe the present load voltages Check system for unbalance cause 2 Increase the fault interrogation time if necessary 3 Increase the percent unbalance setting if necessary Front Under Voltage Average phase voltage below minimum 1 Check system for under voltage cause 2 Increase the percent under voltage settin...

Page 26: ... the Enter Password menu appears 3 Press ENTER then enter the supervisor password 2112 UP and DOWN changes the number and LEFT and RIGHT chooses the number to change 4 Press ENTER after typing in the password If the password was accepted the screen shown to the right will be displayed Press the MENU button to return to the main menu If not press the MENU button and repeat steps 1 4 Appendix D Ente...

Page 27: ...s the DOWN button until the Inputs SI menu appears 6 Press ENTER and then press the UP button until Run Stop appears on the screen usually M 9 7 Press ENTER hit the DOWN button to change the value to MAN ON then press ENTER again 8 Press the MENU button to return to the main menu The unit should now start powering back up if there are no current alarms Enable Run Stop Appendix D ...

Page 28: ...endix E 1 Press the MENU button on the keypad The Main Menu will appear 2 Press the DOWN button until the Service Tools menu appears then press ENTER 3 Press the UP and DOWN buttons until either the Current Date or Current Time menus appear 4 Press ENTER Based on your selection either the current date or the current time will be displayed ...

Page 29: ...or time press the ENTER button again This will allow you to edit the current values Press the UP and DOWN buttons to change the value and LEFT and RIGHT to choose what you are changing 6 Press ENTER when finished and the changes will be saved Press any button to return to the Current Date or Current Time menu and press MENU to return to the Main Menu ...

Page 30: ...________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _________________________________________...

Page 31: ...______________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ ___________________________...

Page 32: ...Drake Refrigeration Inc 2900 Samuel Drive Bensalem PA 19020 888 289 7299 Phone 215 638 5515 Fax 215 638 5518 ...

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