K-Patents DD-23 - Manual (Page 14)

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3.3 Switch inputs
3.3.1 External Divert switch/push button - input J8
An external divert switch can be connected to the DD-23 Divert Control Unit, input J8.
If the external divert switch is not used, a jumper has to be connected across J8. The
unit is delivered with this jumper connected.
3.3.2 External divert reset button - input J9
If you want to use external Divert reset button, it can be connected max. 200 m (600 ft)
from the DD-23 Divert control unit. Use normal instrument cable 2x0.5 (AWG 20) and
connect cable to DD-23 motherboard input J9.
You must make sure both refractometers A and B are working OK before starting to
use the remote divert button (the remote interface can be used to check on the refrac-
tometers, see Chapter 8).
The external reset button connection is normally open (NO).
3.3.3 Header wash key - input J10
Black liquor is injected to the recovery boiler through liquor guns. Occassionally the
header ring needs washing and during that procedure the divert system has to be
by-passed and the liquor guns have to be removed from the furnace. The Digital Divert
Control System DD-23 allows for a safe override of divert logic during header ring
wash.
The override is mounted by connecting the gun micro switches in series to the Header
wash/override key switch input J10, see Figure 3.5.
The Header wash key may be used without the external switch information if a jumper
(dotted line in Figure 3.5) is placed to swith input J10. If the input is left open, the key
does not have any effect.