Vertiv Liebert MC - Maintenance; Safety Instructions

19
Liebert
®
MC - UM - 10019237MAN_ENG - 31.03.2022
9.
10. Maintenance
NOTICE
Check the unit regularly and solve the problems as they occur.
Lack of maintenance could reduce the performance or damage the unit.
10.1 Safety Instructions
Personnel WARNING
Only authorized personnel is allowed to do maintenance operations.
The authorized personnel must be properly trained and qualied, wear appropriate personal
protective equipment and use adequate tools.
Electric
System
WARNING
Unit contains potentially lethal voltage in some circuits.
Risk of arc ash and electric shock.
Can cause injury or death.
• Open all local and remote unit electric power disconnect switches, verify with a voltmeter that
power is OFF and wear protective equipment per local standard before working within the
electric control enclosure.
WARNING
The electric connection enclosures, the fan speed control and the EC fan enclosures can retain a
stored high-voltage electrical charge for up to 10 minutes.
Risk of electric shock.
Can cause serious injury or death.
Before working within the unit electric connection enclosures or working within the fan speed
control and the EC fan enclosures proceed as follows:
• open all local and remote unit electric power disconnect switches
• wait 10 minutes
• verify with a voltmeter that power is OFF
Only properly trained and qualied personnel may perform repair, maintenance and cleaning.
Automatic
Restart
WARNING
Fan blades can automatically start rotating without warning at any time during a cooling cycle or
after power is restored after a power failure.
Risk of contact with high-speed, rotating fan blades.
Can cause serious personal injury or death.
Before working within the unit cabinet, removing the fan guards or servicing the fan speed control,
fan blades or EC fan motors proceed as follows:
• open all local and remote electric power supply disconnect switches
• wait 10 minutes
• verify with a voltmeter that power is OFF
WARNING
This unit operates and restarts automatically.
The fans may suddenly start blowing out a strong air ow, which may carry particles and small
objects from inside the unit.
Can cause serious personal injury.
• Wear eyes protection when you need to get close to the unit while it is operating.
• Turn the main switch to OFF to disconnect the unit from the power supply before any operation
on the unit.