Maintenance
Electrical Inspections
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/isolator
● Dedicated power supply
● Voltage at permanent supply
● Emergency Backup supply (-48VDC)
● Control voltage at transformer 24V (min 21.6V, max 26.4V)
The voltage measurements should be carried out with the unit MCBs turned off.
Task Frequency
3 Mths 12 Mths 60 Mths
Electrical
Inspections
Check main power supply voltages
●
Check electrical terminals are tight. ●
Check for signs of hot spots/discolouration on power cables. ●
Check operation of electric trace heating ●
Check correct operation of control panel heater & thermostat ●
Check amperages are as per design. ●
Service Tools/Test Equipment
● Voltmeter
● Screwdrivers/Allen Keys (4mm tamper
proof)
● Ammeter
Safety Equipment
● Safety Glasses/Goggles
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