K-Patents DD-01 - Manual (Page 4)

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2.2. OPERATOR PANEL
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7
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Figure 2.20 The operator panel.
The operator panel has a clear layout and the operator can see all information at one glance. The divert deci-
sion is controlled from the operator panel which provides doubled security, since all information is simultane-
ously shown both as LED indication in the Divert Control Unit and as a diagnostic messages in the Indicating
Transmitters (Figure 2.20).
Each refractometer has a green OPERATING light (1), so the operator knows when he can rely on the refrac-
tometer measurement. A refractometer will influence the divert decision only when the green OPERATING
light is on. A malfunctioning refractometer is automatically taken out of operation. One green indicator light
SAFE% SOLIDS (2) is based on the two refractometers and the divert decision rules (Section 5.7).
One red DIVERT light (3) that will be switched on when the SAFE% SOLIDS goes off. The DIVERT light
indicates divert status of the divert relay. The divert relay has an output switch contact, for use in the Black
Liquor Firing Tripping Logic. The relay is OFF in the DIVERT position, because a power failure will give a
DIVERT decision.
A lockable OVERRIDE/AUTOMATIC switch (5) and a red OVERRIDE warning light (4) is ON always if
switch in OVERRIDE position. If the SAFE% SOLIDS goes OFF and this switch is in the OVERRIDE posi-
tion, then the OVERRIDE light is lit instead of the DIVERT light. One RESET push-button (6) for the
DIVERT action. The DIVERT action always has to be manually reset. If the override switch is in Automatic
position and SAFE% SOLIDS is off, the DIVERT action cannot be reset.
One EMERGENCY DIVERT push-button (7) to manually initiate DIVERT in an OVERRIDE or emergency
situation. The DIVERT light is lit also after manual divert action. The EMERGENCY DIVERT button has a
protective hinged cover, to prevent inadvertent use.
Two indicator lights (8) for the divert valve status TO BY-PASS/TO BURNER from microswitches on the
valve. For intermediate valve positions both lights are off.
A row of four alarm lights (9) that indicate black liquor SOLIDS WARNING (at 60%), black liquor SOLIDS
ALARM (below 58%), refractometer reading more than 2% absolute difference and refractometer malfunc-
tion.
INSTRUCTION MANUAL FOR DD-01 DOCUMENT/REVISION: IMD 1/5
Effective: June 20, 2005