Nordson Encore HD iControl 2, Installation, Troubleshooting, Repair

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© 2022 Nordson Corporation
1609758-04
4-30 Troubleshooting
Photoeye, Encoder, and Interlock Troubleshooting
Use the I/O board LEDs and the relay LEDs in the main console to troubleshoot problems
with the photoeye, encoder, interlock, and alarm circuits.
Table 4-11 Photoeye, Encoder, and Interlock Troubleshooting
Inputs
I/O Board
Terminals
Troubleshooting
Zone Photoeyes 1 − 8
Photoeyes are set for breaklight. When a part passes in front of the zone
photoeyes, the LEDs for the zone photoeyes should light. If they do not, check
the photoeye wiring and photoeyes.
Flag Photoeyes or
scanners or Inputs
from customer Part
ID system
9 −16
Photoeyes and scanners are set for breaklight. When a flag passes in front of
the photoeyes, the LEDs for those photoeyes blocked by the flag, or the LEDs
receiving a signal from the customer part ID system should light. If they do not
check the wiring and photoeyes or customer part ID system.
Encoder 20
The LED should flash at the same rate as the encoder signal. If it is not
flashing when the conveyor is moving check the encoder wiring and encoder.
Conveyor Interlock 24
The LED should light as long as the conveyor is on or the keyswitch is in the
bypass position. If it is not on check the conveyor interlock wiring. Without this
signal the spray spray guns will not be triggered.
Relays (DIN rail) −
The conveyor interlock relay LED lights when the conveyor is running. The
remote lockout relay LED is lit as long as it is receiving a signal (lockout on).
The alarm relay LED stays lit until an alarm occurs, then goes out.
All 1−24
Input LEDs should indicate as described above. If none of the LEDs will turn
on, then check the following screens:
Zone and Part ID Inputs: Open the Input Status screen. Inputs should display
as lighted indicators.
Encoder: On the Main screen, if the encoder is providing a signal then the
conveyor speed should be greater than zero.
Conveyor Input: On the Main screen, if the conveyor is running then the
conveyor indicator should be green.
If the input indicators on the Main and Input Status screens are lit but the I/O
board LEDs are not, then:
Check the dipswitch and jumper settings on the I/O board (see Figure 7-4 for
the settings). If settings are correct, replace the I/O board and ribbon cable. A
new cable is shipped with the I/O board.
WARNING:
Always turn console power off before changing jumper and
dipswitch settings on circuit boards. If ribbon cable is not keyed, make sure
the colored trace in the ribbon cable is aligned with pin 1 at both connectors.
If the conveyor interlock LED (24) on the I/O board is operating correctly
and all or some of LEDs 1−20 are responding erratically, then check the I/O
board inputs common voltage. For sinking inputs, +24 Vdc is applied to all HI
terminals on the board as inputs common.