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Maintenance and Troubleshooting
8.3
Troubleshooting
8.3.1
7SS601 measuring system
Replacing the mini-
fuse
8-4
If the device indicates a defect, the following procedure is recommended:
If none of the LEDs on the front panel of the device is on, then check:
q
Has the module been properly pushed in and locked?
q
Is the auxiliary voltage available with the correct polarity and of adequate magni-
tude, connected to the correct terminals (block circuit diagrams are given in Appen-
dix A.2 and A.3)?
q
Has the mini-fuse in the power supply section blown? If required, replace the mini-
fuse according to the section "Replacing the mini-fuse" below.
If the red fault indicator LED is on and the green ready LED remains dark, re-initializa-
tion could be tried by switching the auxiliary voltage off and on again.
This, however, results in loss of parameter settings in a parameterizing process has
not yet been completed. Additionally, date and time must be set again (refer to chapter
4.2.5).
q
Select a replacement fuse 5 x 20 mm (refer to Section A.4). Ensure that the rated
value, time lag (slow) and code letters are correct.
q
Prepare the area of work: provide a conductive surface for the module.
q
Slip away the covering caps at the top and bottom of the housing, making accessi-
ble one screw each in the top and bottom center. Unscrew these two screws.
Warning!
Hazardous voltages can be present in the device even after disconnection of the sup-
ply voltage (storage capacitors!).
q
Pull out the module by taking it at the front panel and place it on the conductive sur-
face.
..
Warning!
Electrostatic discharges via the component connections, the p.c.b. tracks or the con-
necting pin must be avoided under all circumstances by previously touching an
earthed metal surface.
q
Remove the blown fuse from the holder.
q
Fit the new fuse into the holder.
q
Insert the module in the housing.
q
Fix the module in the housing by tightening the two fixing screws.
Switch the device on again. If a power supply failure is still signalled, a fault or short-
circuit is present in the internal power supply. The device should be returned to the
factory (refer to chapter 8.4).
7SS60 Manual
E50417-G1176-C132-A2
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Table of Contents
Troubleshooting
