Grass Valley Trinix Back-Up Power Supplies Nov 16 2012 - Manual (Page 36)

Trinix — Installation and Service Manual 36
Removing the Power Supply and Inserting Too Soon
When a power module is removed:
1. Wait until the module fans stop spinning (approximately 10 sec.).
2. Re-Insert the module.
Cycling the power for short periods of time or a Power Failure
When a power failure lasts between 1 to 10 seconds, the power supply may
come back up in an alarm condition.
To correct the alarm condition, do one of the following:
Extract the power supply module
1. Extract the alarming power supply module.
2. Wait until the module's fans have stopped spinning (approximately 10
sec.).
3. Reinsert the power supply module.
Remove AC power to the System
1. Remove AC power to the system
2. Wait until the power supply module's fans have stopped spinning
(approximately 10 sec.).
3. Reapply the AC power, simultaneously to all power supply modules.
For more information see Lineage's documentation for the CP1800-AC52
power supply.
Reference
Page 5 of the Linage manual, in the "Hot Plug" section states:
When rapidly extracting and reinserting modules care should be taken to
allow for discharging the internal bias supply so that a predictable restart
could be achieved. The way to ensure that the circuit sufficiently discharges
is to observe the spinning of the fans after an extraction. The unit should
not be reinserted until the fans stop spinning.
Regarding hot-plug issues, it is possible to essentially lock up the processor
during re-insertion if the Vcc of the processor is still decaying as the power
supply is plugged in. That is why we request on the data sheet to refrain
from re-inserting the supply until the fan stops spinning. This is a known
issue that only occurs during a rapid reinsertion. No physical damage
occurs, but a re-insertion is necessary.