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7. Troubleshooting 

 
 

Problem 

Possible Cause 

Solution 

Unit does not power up, 
power LED is OFF 

No power from fused spur. 

Check fused spur 

Faulty power supply. 

Check 230V mains voltage into power supply and 
24VDV output. 

Blown power supply fuse. 

Check fuse and replace if needed 

Fault LED and buzzer ON 

Fault code read from indoor unit 
which is not 8000 (8000 = OK). 

Check indoor units for problems. 

High temp alarm has activated. 

Check for indoor unit faults or other possible causes 
of a high inlet temperature. 

Incorrect number of indoor units 
configured. 

Check the number of units has been configured 
correctly.  

Invalid addressing of 
MelcoBEMS MINI (A1M) units. 

Check every MelcoBEMS MINI (A1M) unit has a 
unique Modbus address (Slave ID), starting from 
address 1. 

MelcoBEMS MINI (A1M) units 
not powered up. 

Check the two LEDs on all connected MelcoBEMS 
MINI units are either ON or flashing. 

RS-485 wiring issue. 

RS-485 wiring issue. Check all ‘A’, ‘B’ and ‘GND’ 
connections are daisy chained together. 

MelcoBEMS MINI (A1M) units 
have Incorrect RS-485 comms 
settings.   

Check the MelcoBEMS MINI (A1M) comms settings 
are set to 9600 baud, no parity. 

Interference on RS-485 cable. 

Check shielded RS-485 cable has been used to 
reduce possibility of electrical noise/interference. 

Fault LED ON and buzzer 
OFF 

A fault exists and the Mute 
button has been pressed 

Refer to the ‘Fault LED and buzzer ON’ problem for 
information on the possible causes of the fault.  

 
 
 

 

Содержание MelCOMMS MINI

Страница 1: ...elCOMMS MINI FOR INSTALLERS INSTALLATION MANUAL Manual version 1 0 0 Firmware version 1 0 0 For safe and correct use please read this installation manual thoroughly before installing the PROCON MelCOM...

Страница 2: ......

Страница 3: ...may also be utilized in residential domestic environments but may cause interference and require the user to take adequate corrective measures This is a Class A product In a domestic environment this...

Страница 4: ...damages consequent to the user of this product We reserve the right to change this manual at any time without notice The information furnished by us is believed to be accurate and reliable However no...

Страница 5: ...egister Document Version Latest Firmware Version Date Author Notes 1 0 0 1 0 0 12 07 17 GD Initial version Any additional notes since printing will be appended to the rear of this document on separate...

Страница 6: ...1 Fig 1...

Страница 7: ...2 Fig 2 Wiring Diagram...

Страница 8: ...nation resistor LK3 Line B Pull down resistor Fig 3 3 MelcoBEMS MINI A1M DIP switch configuration MelcoBEMS MINI A1M RS 485 resistors Each MelcoBEMS MINI A1M unit must have a unique address on the RS...

Страница 9: ...ply 9 5 3 Modbus RS 485 connection 9 5 4 Configuration 10 5 5 Initial Power ON 12 5 6 Status Indicators 12 5 6 1 Fault LED 12 5 6 2 Buzzer 12 5 6 3 Relay Status LEDs 12 5 6 4 RS 485 Comms Status LED 1...

Страница 10: ...e by a licensed electrician according to Electric Facility Engineering Standard Interior Wire Regulations and the instructions given in this manual and always use a special circuit If the power source...

Страница 11: ...nductor would be the last to take the strain Ensure that the mains cable supplying the MelCOMMS MINI is rated to the following specification 1 5mm2 3 core flexible flex blue brown yellow green Externa...

Страница 12: ...A1M interfaces Compatible Air To Air model numbers can be found in Appendix A of this document Figure 1 shows the MelCOMMS MINI dimensions Figure 2 shows the MelCOMMS MINI wiring diagram for connectio...

Страница 13: ...con MelCOMMS MINI unit 2x Procon MelcoBEMS MINI A1M units This installation instruction manual Please contact your supplier if any of these components are missing 4 2 Before switching ON Please carefu...

Страница 14: ...wire or copper wire with too large capacity may cause a risk of malfunction or fire Be sure to take power from the special branch circuit Install the unit to prevent any of the control circuit cables...

Страница 15: ...will be used as follows Digital Input 03 Digital Input 04 Settings name Units connected Units running Days between rotation High temperature alarm C Setpoint C Mode No link No link RS1 2 1 7 26 20 CO...

Страница 16: ...of units running 1 4 1 5 1 6 0 0 0 1 0 0 1 2 0 1 0 3 0 1 1 4 1 0 0 5 1 0 1 6 1 1 0 7 1 1 1 8 1 5 1 6 1 7 Days between rotation 1 7 1 8 0 0 1 day 0 1 3 days 1 0 5 days 1 1 7 days 1 8 2 1 Temperature s...

Страница 17: ...the power LED there is a Fault LED which will illuminate whilst a fault is present The conditions which cause the unit to go into fault are A communication fault between MelCOMMS MINI and one or more...

Страница 18: ...es are two LEDs one of these will constantly be ON and the other will flash to indicate successful Modbus communication with the MelcoBEMS MINI A1M units If both are permanently ON then this indicates...

Страница 19: ...to share the cooling load If the high temperature is exceeded by any unit while backup and rotate is active all units are brought into operation If a fault is detected the next available unit will be...

Страница 20: ...t to communicate with any MelcoBEMS MINI A1M devices the RS 485 port will instead be used to provide Modbus RTU Slave functionality In this mode the MelCOMMS MINI will have the following fixed communi...

Страница 21: ...1 10002 Digital Input 3 state 2 10003 Digital Input 4 state 3 10004 Input IN01 state 4 10005 Input IN02 state 5 10006 Input IN03 state 6 10007 Input IN04 state 7 10008 Input Status Registers can be r...

Страница 22: ...d addressing of MelcoBEMS MINI A1M units Check every MelcoBEMS MINI A1M unit has a unique Modbus address Slave ID starting from address 1 MelcoBEMS MINI A1M units not powered up Check the two LEDs on...

Страница 23: ...100 125 140KAQ PEAD RP35 50 60 71 100 125 140JAQ PEAD RP35 50 60 71 100 125 140EA EA2 PEA RP200 250GAQ PKA RP35 50HAL PKA RP60 71 100KAL PLA ZRP35 50 60 71 100 125 140BA BA2 PLA RP35 50 60 71 100 125...

Страница 24: ...lease be sure to put the contact address telephone number on this manual before handing it to the customer MITSUBISHI ELECTRIC UK MITSUBISHI ELECTRIC UK TRAVELLERS LANE HATFIELD HERTFORDSHIRE AL10 8XB...

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