1139300
Shadow 8 User Manual
4-10
Troubleshooting
Performing a Resistance Test
If there is a problem with the relays but the light curtain is in an “Unobstructed” state (i.e., the
Machine Run/Stop LED is illuminated green), perform a resistance test on the OSSD 1 and
OSSD 2 relay contacts, using a DVOM (Digital Volt-Ohm Meter), as shown below. Replace
the Relay board if you find a bad relay, following the instructions on page 4-11.
1.
Turn off power to the Shadow 8 control.
2.
Open the door of the Shadow 8 control box.
3.
Carefully remove the wires connected to terminal block TB4 on the Relay board, and cap
them to avoid an electric shock and prevent a short circuit on the Shadow 8 board. See
Figure 2-20, page 2-32 for the location of the Relay board on the Shadow 8 Main board.
4.
Turn on power to the Shadow 8 control, and verify that the light curtains are in an
Unobstructed state (i.e., Machine Run/Stop LED is green).
5.
With the DVOM set to “Ohms,” measure the resistance across the OSSD 1 N/O contacts,
pins 1 and 2 on TB4. These pins are labelled “N.O. 1” on the Relay board. The resistance
should be less than 5 ohms. If it isn’t, replace the Relay board (see next section).
6.
Measure the resistance across the OSSD 2 N/O contacts, pins 3 and 4 on TB4 (labelled
“N.O. 2”). If the resistance is not less than 5 ohms, replace the Relay board (see next
section).
7.
Obstruct the light curtain (Machine Run/Stop LED should be red), and measure the
resistance across the OSSD 2 N/C contacts, pins 5 and 6 on TB4 (labelled “N.C.”). The
resistance should be less than 5 ohms. If it isn’t, replace the Relay board (see next
section).
8.
Reconnect the wiring you removed in step 3.
9.
If the relay contacts test out correctly, check the wiring going to TB4 and its voltage, if
applicable, referring to the wiring diagrams at the back of the manual to determine your
exact wiring configuration.
GUARD AGAINST ELECTRIC SHOCK HAZARD WHEN CHECKING RELAYS
• Turn off and disconnect power from the Shadow 8 safety light curtain and from the
machinery it is connected to before checking relays, unless the test requires power to
be on. This includes disconnecting power to the machine control and motor.
• Ensure that all tests are performed by qualified personnel.
Failure to comply with these instructions could result in death or serious injury.
Make a sketch of the existing wiring connections to consult when you rewire TB4 in step 8.
WARNING
!
NOTICE
Содержание Shadow 8
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Страница 107: ...1139300 Shadow 8 User Manual 4 12 Troubleshooting ...
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