Siemens SIPROTEC 7SJ62 Instruction Manual page 414
Multi-functional protective relay with bay controller
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Also See for SIPROTEC 7SJ62:
- Manual (704 pages) ,
- Technical data manual (58 pages) ,
- Manual (94 pages)
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Routine Checks and Maintenance
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Replacing the
Power Supply Fuse
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9-10
Remove the corner covers on the front panel and loosen the screws that are holding
the front panel to the device case.
Carefully pull off the front panel. The component is connected to the CPU board with
a short ribbon-cable.
Follow this step for a surface-mounted device. Here the front panel is not connected
with a ribbon cable.
Caution!
Electrostatic discharges through the connections of the components, wiring, and plugs
must be avoided! Wearing a grounded wrist strap is preferred. Otherwise, first touch
a grounded metal part.
Warning!
Dangerous voltages exist in the device, even after the power supply is disconnected
and the boards are withdrawn from the case! Capacitors can still be charged!
At one end, disconnect the ribbon-cable between the front panel and the CPU board.
To disconnect the cable, push up on the top latch of the plug connector and push down
on the bottom latch of the plug connector. Carefully set the front panel on the grounded
mat.
For the surface-mounted device, the 7-pin connector X16 must be disconnected from
the CPU board behind the D-subminiature port, and the ribbon-cable that runs to the
68-pin connector on the back must be detached. Carefully set the front panel on the
grounded mat.
Disconnect the ribbon-cable between the CPU board and the I/O board.
The boards can be removed and laid on the grounded mat to protect them from ESD
damage.
A greater effort is required to remove the CPU board from the device designed for sur-
face-mounting.
Verify that the replacement fuse has the correct amperage, delay time, dimensions,
and identification.
The data are printed on the CPU board under the fuse, as shown in Figure 9-5. A
single 5 x 20 mm fuse applies to all 7SJ62:
T4H250V acc. IEC 60127–2.
Remove the CPU board. Place the board on the grounded mat for protection against
ESD damage.
A greater effort is required to remove the CPU board in a device designed for surface-
mounting. Place the board on the grounded mat.
Remove the defective fuse. Figure 9-2 illustrates the fuse. The location is subject to
change, but there is only one fuse on the CPU board.
S
7SJ62 Manual
C53000-G1140-C121-1
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