Service Tools/Test Equipment
• Voltmeter
• Screwdrivers / Allen Keys
• Ammeter
Safety Equipment
• Safety Glasses / Goggles
Maintenance
Electrical Inspection
Procedures
Electrical Connections
Ensure all electrical connections are tight and correctly terminated.
Electrical Earthing
Check that the unit is correctly earthed.
Voltage
Measure the voltage at the following points and record on the maintenance sheet:
• Voltage at busbar
• Dedicated power supply
• Voltage at permanent supply
• Control voltage at transformer (min 22.5V, max 25V)
The voltage measurements should be carried out with the unit MCB’s turned off.
EC Fan Interrogation
The EC fans can be interrogated by connecting a hardware interface kit to the fan and PC. The kit comprises of a USB
to RS232 9-pin “D-type” adapter. This should be installed on the PC with the software supplied with the kit. The “COM”
port of the USB to RS232 adapter should be assigned to a free COM port between COM 1 and COM 4 via the system
device manager.
Connect the RS232 to RS485 interface converter to the USB port of your PC via the USB to RS232 serial interface lead
and connect the RS485 output to the fan.
Tx += RS A Tx - = RS B
Electrical Inspections
Task Frequency
3 Months 12 Months 60 Months
Check main power supply voltages
●
Check electrical terminals are tight
●
Check for signs of hotspots/discolouration on power cables
●
Check amperages are as per design
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