ATI
Q45C2 2E Conductivity System
Part 4 – Configuration
O & M Manual
Revision K (01/07)
- 35 -
chattering; however, it may also be used in control schemes
to separate the ON/OFF trip points of the relay. Press
ENTER to initiate user entry mode, and the value will flash.
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 conductivity value
exceeds
the
setpoint. When the phase is LO, the relay energizes and the
LCD indicator illuminates when the conductivity 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 4-3 below for a visual description of a typical
control relay application.
When value rises to
≥
1.000 µS, relay closes.
When value falls to
≤
1.000 µS, relay opens.
Settings:
Setpoint: 1.000
µS
Hyst: 0.050
Delay:
000
Failsafe:
OFF
When value rises to
≥
1.000 µS, relay opens.
When value falls to
≤
1.000 µS, relay closes.
