Detcon X40-32-N7 - Manual (Page 57)

Model X40
Model X40 Instruction Manual Rev. 3.3 Page 51 of 64
8.0 Troubleshooting Guide
Unit will not power up
Verify correct AC or DC voltage selection.
Verify correct VAC and VDC powering configuration.
Relays are not firing
Verify that the alarm relays are configured properly.
Alarms on constantly
Ensure that no channels are set to ascending or descending incorrectly.
Alarm Firing causes unit to "Lock Up"
Verify that the alarm annunciator current draw does not exceed the on-board power supply limits. Replace
with external power supply if necessary.
Contact the Detcon Service Department for further troubleshooting assistance at 713-559-9200.
8.1 Replacement of the display PCA in NEM7 units
The NEMA 7 units come with the display assembly PCA P/N 500-005142-100.
1. Remove the NEMA7 enclosure cover from the enclosure and set aside.
4. Unplug the connector to J7 of the Display PCA.
5. Remove the screws holding the PCA to the enclosure base, and remove the PCA completely.
6. Install the new PCA in the enclosure using the screws removed above
7. Ensure that the connector is wired correctly according to figure below.
8. Re-install the cove on the enclosure.
PWR
GND
A2
B2
A1
B1
SW
J7
R8
S
W
1
S
W
2
S
W
3
S
W
4
D3 D4 D5 D6
M A IN
S E C O N D A R Y
1
1
J2
J6
J5
1
PWR
GND
A2
B2
A1
B1
SW
J7
A1, B1 are Master
RS-485 Port
A2, B2 are Slave
RS-485 Port
SW - Reset Switch
Connector PCA
Figure 42 NEMA 7 Display Assembly PCA