Emerson Centellis 2000 Shelf Release 3.0 Manual page 171

Safety Notes
PEM Damage
Placing the PEM circuit breaker to the ON position while there is a permanent short circuit in
the system may lead to PEM damage.
Make sure that there is no shortage in the system.
Fan Trays
System Damage
Insufficient cooling may damage the system.
The cooling system is designed to provide sufficient cooling with a single fan tray at work.
However, under bad conditions or due to a failure of the remaining fans, the cooling capacity
of a single fan tray may not suffice.
Avoid delays during fan replacement.
Fan Damage
When a fan tray is taken out of operation or is removed during a replacement procedure, the
system manager will compensate for the loss by increasing the speed of the remaining fans.
Turning on high speed for a long time may shorten the life of the fans and may exceed
allowable acoustic noise limits.
Replace the fan tray without delays.
System Damage
Removing the single operating fan tray will lead to overheating very quickly.
Make sure that there is always one operating fan tray present in the system.
Personal Injury
Rotating Fans
Inserting tools or fingers into operational fans may cause injuries.
Keep clear of the fans as long as they are rotating.
Centellis 2000 Shelf Release 3.0 Installation and Use (6806800L99F)
171