Technical Information
Chapter
8
HC8X Heat Control
Troubleshooting
8010043
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SICK AG · All rights reserved
8-41
8
Troubleshooting
8.1
Power Electronics Overload Protection
To protect the power electronics, one thermally delayed overcurrent trip per power output
is series connected with 4 A, 8 A or 16 A.
After the actuation of an overcurrent trip, it must be acknowledged after a waiting time of
approx. 1 minute by pressing the button (see Fig. 8-1).
When an overcurrent trip responds:
1.
Determine the cause of the error.
2.
Acknowledge the overcurrent trip with a button.
Danger of electrical shock!
Do not touch live parts.
Disconnect all poles of the power section and control section from the supply voltage
before opening the case.
Check whether the power section and the control section are free from voltage.
8.2
Primary-Side Fuses of the Control Electronics
The supply voltage of the control electronics is connected via the mains socket with variable
voltage preselection of 115 V/230 V, 50
–
60 Hz (see Fig. 3-1, page 3-21).
1.
Unlock the fuse holder with a screwdriver on the side tongue and pull it out.
2.
Pull out the contact bridge of the supply voltage switch-over and turn it so that the de-
sired voltage rating is visible in the indicator window of the mains socket (e.g. 115).
3.
Reinsert the contact bridge of the supply voltage switch-over.
4.
Reinsert the required fuses in the fuse holder:
– With 115 V preselected voltage: 2 x 0.4 AT (slow blow), size 5 x 20
– With 230 V preselected voltage: 2 x 0.2 AT (slow blow), size 5 x 20
5.
Firmly press in the fuse holder until you hear it click into place.
6.
Check the value of the preset supply voltage by visual inspection of the indicator win-
dow in the fuse holder.
8.3
Secondary-Side Fuses of the Control Electronics
The secondary-side fusing is divided into three separate circuits (see Fig. 8-1).
SI1 = fuse size 5 x 20, 1 AT (slow blow)
SI2 = fuse size 5 x 20, 2 AT (slow blow)
SI3 = fuse size 5 x 20, 0,2 AT (slow blow)
When a fuse is blown:
1.
Unscrew two screws from the case cover.
2.
Remove the case cover and pull off the ground conductor.
3.
Pull the plug.
4.
Determine the cause of the error.
5.
Replace defective fuse.
6.
Connect the ground line with flat plug contact and check correct seating.
7.
Close and screw on the case cover.
