Siemens APACS+, Installation And Service Instruction

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Maintenance SD39EAM-1r4
3-4
September 2005
3.4.1 Main Fuse Replacement
The EAM’s main input fuse F1 is field replaceable. A failed main fuse is detected by on-board
diagnostics and annunciated by
4-mation. Another indication of a failed main fuse is when both status
LEDs on the module are OFF. A failed main fuse causes the EAM to be completely inoperative.
NOTE
A service kit containing a grounding wrist strap and static dissipative mat
is required to change a fuse. Use the kit whenever the module’s
protective cover is removed. A kit is available from Siemens under PN
15545-110, or a kit can be purchased locally.
Refer to Figures 3-1 and 3-2 and the following to replace a failed main fuse:
1. Prepare a work bench with a soft pad covered by a static dissipative mat.
2. Refer to section 3.5 for the EAM removal procedure. Carefully remove the module from the rack and
set it on the prepared work bench. Connect the wrist strap’s ground wire to the static dissipative mat.
3. Refer to Figure 3-1 and remove the module’s protective cover. Refer to Figure 3-2 and locate and
replace the failed fuse.
Fuse PN 7447-148 1.6A, 250V, FastBlo. Use a Ohmmeter to confirm that the removed fuse has
failed.
4. Replace the module’s protective cover and torque all securing screws to 8 in.lbs. (+/- 1 in.lb.).
Unsnap the wrist strap’s ground lead from the mat.
5. Refer to section 3.5 and install the module in the rack. Check the performance of the module.
Operate the module for a period of time to ensure that a condition does not exist that will cause the
replacement fuse to fail.
6. If applicable, activate the process.