K-Patents DD-23 - Manual (Page 18)

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4.2 Divert control unit DD-23 startup
For the refractometer startup, consult Chapter 5 in the separate Process refractometer
PR-23 manual.
1. Check the wiring and supply voltage.
Before the power is switched on, the divert output relay ’normal operation’ is in
divert position.
2. Connect the mains power to start the system.
There are no power switches in the instruments. They are always On when the
mains power is connected.
3. While the Control unit is powering up, the DIVERT and SOLIDS ALARM lights are both
blinking. When the unit is fully functional, it is in the divert mode: the DIVERT light
is on and the SOLIDS ALARM light is blinking.
4. Press the LIGHT TEST button on the Divert control unit. All 12 lights should switch
on.
5. Reset the solids alarm by pressing the ALARM RESET button.
The indicator stops blinking and should stay on.
6. Each indicating transmitter should now state refractometer letter, either a or b, in
the upper left corner of the transmitter display. If there’s a question mark instead
of a letter on either of the transmitters, see Chapter 6.
If the process pipe is full, the message for each refractometer should be
NORMAL
OPERATION ; if process pipe is still empty, message will be NO SAMPLE .
Now activate refractometer A into the Divert by pushing the button A IN OPERATION
on the Divert control unit panel. The button lights up and on the transmitter dis-
play the refractometer letter changes to capital A. Then activate refractometer B
similarly by pushing the button
B IN OPERATION .
If the green IN OPERATION light blinks, the refractometer in question is perform-
ing wash. The refractometer will automatically come into operation after it has
󰅮inished washing.
7. Now the Divert control system DD-23 is set for normal monitoring operation.
8. When black liquor is in the line, check that the prism wash is working for each
refractometer. First press soft key MENU on the transmitter keyboard, then choose
3 SYSTEM STATUS to get to the system status display. Now press soft key WASH to
initiate manual wash; follow the optical image and check that it changes during
the steam wash. If wash was successful, wait until message is
NORMAL OPERATION
and then proceed with startup. If wash doesn’t seem to work, see Chapter 6.
9. If the three green lights on the third row are all on and all conditions for safe boiler
operation are satis󰅮ied, turn off diversion by pressing the DIVERT RESET button. All
warning lights are now turned off and only the 3 green lights are on.