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Replacing AC Input Fuses
Copyright © 2005-2006 Eaton Corporation. All Rights Reserved.
IPN 997-00012-41D December 2006
7-9
Replacing AC Input Fuses
Each AC power socket has two fuses (one in the phase (L) and another in the neutral (N) AC
input line) to protect the power system against certain internal fault conditions.
Only service personnel should replace the AC input fuses.
Ensure that the AC supply is disconnected from those fused AC power sockets
before checking or replacing their respective fuses.
CAUTION: DOUBLE-POLE / NEUTRAL FUSING
Use only 15 A, 250 VAC, 6.3 x 32 mm, fast-acting fuses of the same type
(Bussman ABC-15 or Littelfuse 314-015 Type 3AB) for continued protection against
risk of fire.
► To check and replace AC input fuses
1 Disconnect the AC power cord from the fused AC power socket of the rectifier that is not
operating.
The fused AC power sockets of APS3 power systems are labeled (K1 to K3) and
(K1 to K6) on APS6 power systems. AC power socket K1 powers Rectifier 1.
(See Data Power Solutions diagrams in Chapter 1 for location of Rectifier 1.)
2 With a suitable flat-blade screwdriver, press down the fuse drawer tab to release it from
the fuse holder.
3 Remove the fuse drawer and check both fuses.
4 Replace any blown fuses only with 15 A, 250 VAC, 6.3 x 32 mm, fast-acting fuses of the
same type (Bussman ABC-15 or Littelfuse 314-015 Type 3AB).
5 Re-insert the fuse drawer into the fuse holder and press the fuse drawer until it locks
into position.
6 Reconnect the AC power cord.
7 Check if the affected rectifier powers up and that its green
Power On LED is on.
If not, then that rectifier is faulty and needs to be replaced. (See page 7-
6 for details
about replacing a rectifier.)
If the faulty rectifier has been replaced once and the fuses of that AC power socket blow
again, then there is a problem with the internal wiring of the power system. In that
instance, contact your local Powerware DC product representative for assistance.