Maintenance; Fault Finding - Dräger REGARD-1 Installation, Operation And Maintenance Manual

MAINTENANCE

Check the unit for operation regularly. Service the controller every 12 months.
The transmitter or measuring head may require periodic recalibration. Refer to the
instruction manual for the transmitter or measuring head for guidance.
If batteries are fitted to the control unit then these batteries should be maintained in
accordance with the instructions of the battery manufacturer.
Observe EN 50073 and respective national regulations.

Fault finding

Fault
1 Control unit non operational
2 Display blank
3 Self test routine fails
4 Under-range displayed
5 24 Vdc output too low
6 A1 or A2 24 Vdc output too
low
7 AC output failed
8 Incorrect measuring range
10 No TWA information
11 Water ingress
12 Display repeats power-on test
during normal operation
Note 1: Display board program execution is monitored by a watchdog. A watchdog
reset during normal operation will cause the display to repeat its power-on
self test.
Issue 6 – December 2006
Remedy
Check input fuse (F6). Replace if necessary.
Check third party electrical supply.
Check cable connection between main circuit
board and display board.
Adjust contrast potentiometer on display
board.
Replace display board
Check transmitter connections.
Check and measure loop current.
4-20 units:
Ensure links fitted to positions A, B, C,
D and E of SK2 on main board
Check loading is < 100mA
Check loading is < 100mA
Reduce load
Check loading does not exceed 500mA
Replace fuse.
Check setting of SW1 on display board
Set SW1-F on the display board to ON
Check sealing ring is in place
Replace display board
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