ATI
Q46D-ODO Optical D.O. System
Part 5 – Configuration
41
O&M Manual
Rev-J (8/17)
Use the arrow keys to modify value. Press ENTER to store
the new value.
*A Delay
This function places an additional amount of time delay on
the trip point for relay A. This delay is in addition to the main
delay setting for the controller. The entry value is limited to a
value between 0 and 999 seconds. Press ENTER to initiate
user entry mode, and the value will flash. Use arrow keys to
modify value; range is 0 to 999 seconds. Press ENTER to
store the new value.
*A Phasing
This function establishes the direction of the relay trip.
When phase is HI, the relay operates in a direct mode.
Therefore, the relay energizes and the LCD indicator
illuminates when the oxygen value
exceeds
the setpoint.
When the phase is LO, the relay energizes and the LCD
indicator illuminates when the oxygen level drops
below
the
setpoint. The failsafe setting does have an impact on this
logic. The description here assumes the failsafe setting is
OFF. Press ENTER to initiate user entry mode, and the
entire value will flash. Use the UP arrow key to modify the
desired value; selections include
HI
for direct operation or
LO
for reverse operation. Press ENTER to store the new
value.
See Figure 18 below for a visual description of a typical
control relay application.
Figure 18 - Control Relay Hys & Phase Option
Setpoint: 1.000 ppm
Hyst:
0.050
Delay:
000
Failsafe: OFF
When value rises to
≥
1.000 ppm, relay closes.
When value falls to
≤
0.950 ppm, relay opens.
When value rises to
≥
1.050 ppm, relay opens.
When value falls to
≤
1.000 ppm, relay closes.
Settings:
}
1.000 ppm
0.950 ppm
PHASE: HI
ON
HYSTERESIS
OR
“DEAD BAND”
X
OFF
}
1.050 ppm
1.000 ppm
PHASE: LO
OFF
HYSTERESIS
OR
“DEAD BAND”
X
ON
}
1.000 ppm
0.950 ppm
PHASE: HI
ON
HYSTERESIS
OR
“DEAD BAND”
X
OFF
}
1.050 ppm
1.000 ppm
PHASE: LO
OFF
HYSTERESIS
OR
“DEAD BAND”
X
ON
