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7 - 2
Siemens AG ⋅ January 1999
If the device reports a failure, the following procedure
is recommended.
If none of the LEDs on the device's front panel light
up, check:
D Is the module inserted correctly and secured
tightly?
D Is the auxiliary supply voltage high enough and
connected to the correct terminals with the corĆ
rect polarity (overview diagrams in appendix A)?
D Is the fuse in the module's power supply unit unĆ
damaged (see Figure 7.1)? Replace the fuse as
described in section 7.2.1 if necessary.
If the red fault LED lights up and the green standby
LED is dark, try to initialize the protection by turning
the auxiliary supply off and back on.
However, in this case, parameter values which have
not been saved during a parameterization process
may be lost. The date and time must also be updated
(see section 6.5.1).
D Keep spare fuse 5 x 20 mm as shown in Figure
7.1 at the ready. Make sure it has the correct raĆ
ting, speed (T) and code letter.
D Prepare the working surface: Create a conductive
surface to place the module on.
D Push back the two covers located at the top and
bottom of the front cover; this gives access to two
centrally located screws. Loosen these two
screws.
Dangerous voltages may still be present
in the device (charged capacitors) even
after disconnecting the power supply or
removing the module!
D Hold the module by the front cover, pull it out and
place it on the conductive surface;
It is absolutely essential to avoid elecĆ
trostatic discharge through the compoĆ
nent terminals, conductors and plug
pins by touching earthed metal parts
beforehand.
D Remove the defective fuse from the holder
(Figure 7.1).
D Insert new fuse in the holder as shown in
Figure 7.1.
D Insert module in the housing;
D Secure the module in the housing by tightening
the two screws in the front cover
Switch the device back on. If auxiliary supply failure is
still signaled, there is an error or short-circuit in the
internal power supply. The device should be sent
back to the factory (see chapter 8).
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