HS50_advance_level 2 - 第425页
Stud ent Gu ide HS-5 0 Adva nced II 07/2 002 Ed ition 14 Conve yor System 51 – If the LED also l ights up in ca se of " Stopp er moved in ", the prox imity switch is fau lty . – If the LED lights up but t here …
07/2002 Edition Student Guide HS-50 Advanced II
14 Conveyor System
50
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Fig. 14.3.11 Exchanging the Proximity Switch or Solenoid Valve on the Stopper
Key to Fig. 14.3.11
➠ Before removing the proximity switch, check the problem situation:
– If the control LED at the stopper does not light up in case of "Stopper moved out", the ac-
tuation distance is not set correctly or the supply voltage has been interrupted or the prox-
imity switch is faulty.
1) Basic stopper module 2) Cover: WILL NOT BE REMOVED
3) Slotted screw M 3 x 16 4) Spring-loaded pressure plate
5) Proximity switch for stopper position with
control LED
6) Clamping unit for proximity switch : set
screw M3
7) Clamping unit for sensing head of sonar
proximity switch: set screw M3
8) Valve assembly
9) Plug-and-socket connection of solenoid
valve
10) O-ring 3 x 1 NBR 70B
11) Screws to fasten the solenoid valve
2 hexagonal socket head cap screws
M1,6 x 14
Student Guide HS-50 Advanced II 07/2002 Edition
14 Conveyor System
51
– If the LED also lights up in case of "Stopper moved in", the proximity switch is faulty.
– If the LED lights up but there is not proximity switch signal (sequence comes to a halt with
an error message), there may be a break in the signal line in the proximity switch cable, a
poor plug-and-socket connection at SLIO module on PCB1 or PCB2 or a fault in the SLIO
assembly).
NOTE:
The proximity switches for the stopper position have cables with different lengths and therefore
have different Item Nos. .
For the exchange of this proximity switch the proximity switch cable must be run on a weaving
course as far as the SLIO module PCB1 or PCB2 (layout: see ). This may be somewhat compli-
cated due to the routing of the cable inside the machine base.
You may wish to contact the Siemens SMD Service regarding this work. 14
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➠ Undo the clamping unit of the proximity switch on the mount and pull out the proximity switch.
➠ Take off the corresponding cable cut cover and FDUHIXOO\remove the cable ties.
➠ Check whether it would be helpful to pull in the new proximity switch cable with the aid of the
old cable, at least in a partial area.
➠ Proceed accordingly and FDUHIXOO\run the wiring of the proximity switch on a weaving
course as far as the SLIO module on PCB1 or PCB2 (layout: see ).
➠ Detach the plug-and-socket connection ; bzw. ;at the SLIO module PCB1 or PCB2 (see
circuit diagram 6/,2PRGXOHRQ3&% or 3&%).
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➠ Initially, push the new proximity switch only YHU\VOLJKWO\ into the hole and do FODPS the prox-
imity switch LQWKLV position.
➠ Carry out all further assembly steps in the reverse order to that described for removal.
➠ Remove all tools, etc., from the working area of the machine.
➠ Load the SITEST program and activate the stopper. Push the proximity switch so far into the
hole that it switches reliably when the stopper (piston) is moved RXWit (change of signal 0 -> 1).
The control LED on the proximity switch must light up. &ODPS the proximity switch in this po-
sition.
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➠ Pull off the plug-and-socket connection on the faulty solenoid valve.
➠ Undo the screws fastening the solenoid valve to the stopper base unit (2 hexagonal socket
head cap screws M1,6 x 14).
➠ Install the new solenoid valve in the reverse order.
07/2002 Edition Student Guide HS-50 Advanced II
14 Conveyor System
52
➠ Where applicable, push the stopper back into the correct position (centered to conveyor width).
➠ Perform the appropriate )LQDOVVWHSVLQFOXGLQJ)XQFWLRQ&KHFN(see section 14.4).
Test the stopper function in the conveyor menu (place PCB in input) or use SITEST to do so.
NOTE:
In case of a fault in the cable, the cable must be run on a weaving course as far as SLIO module
PCB1 or PCB2 (layout: see ) and plug-and-socket connection X8 or X10 on the SLIO module
PCB1 or PCB2 must be disconnected (see circuit diagram "SLIO module on PCB1" or
"...PCB2").
This may be somewhat complicated depending on the cable routes inside the machine base.
You may wish to contact Siemens SMD Service regarding this work. 14
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NOTE:
Exchange the stopper assembly if the piston is sluggish or leaky.
The stoppers for all of the placement areas are of the same construction.
The assembly "Stopper assembly" is complete, including the solenoid valve (valve assembly).
The proximity switch is not included, because it is advantageous to rebuild it. 14
➠ First, proceed as follows to transfer the mounting position of the stopper to fixed side of the
conveyor:
➠ Where applicable, pull the piston of the faulty stopper out manually (position: "Stopper
moved out").
➠ Push a PCB on the piston of the stopper and transfer the leading edge of the PCB to the
fixed conveyor side with a permanent marker.
➠ Unplug the plug-and-socket connection on the solenoid valve (see Fig. 14.3.11).
➠ Loosen the clamping unit in the cover of the stopper and pull the proximity swiitch out of the
hole (see Fig. 14.3.11). Proceed further according to the conveyor at hand.