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5.2
Testing The Electronic Unit (Continued)
5.3
Testing the Relay Circuits
Customer
M4 / 2.5mm Hex Drive
Connections
View
2
1
M3 / 2.5mm
Hex Drive
10. Turn calibration adjustment counter-clockwise until the
Red LED changes again. If more than 1/3 turn is required
then the unit is faulty.
11. If the IntelliPoint fails all of the above tests, in most cases
the instrument is faulty. Use a replacement Input/Output
Module (IOM) or circuit board to determine fault. Consult
factory.
Use the following steps to check out the relay circuits:
A. Relay circuits consist of a single-pole double-throw relay
contacts brought out to terminal strips for external
switching. See Figure 5-2.
B. Relay operation may generally be heard as an audible
click when background noise is not too high. Connect
ohmmeter to relay contacts to determine if they are
switching.
C. Move the fail safe jumper to th eopposite position. The red
LED will change and relay contacts should also change.
If the contacts do not change, the relay is not functioning
properly.
#8-32 / Phillips-Slotted
5
4
6
3
7
8
M3 / 2.5mm
Hex Drive
M5 / Slotted Drive
Ground Connection
Relay Circuit Operation
Drive
3
NO
Figure 5-2
27
Troubleshooting
4
5
6
7
C
NC
NO
C
NC
8
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