ATI
Q46C2 2Electode Conductivity System
Part 6
– Control
37
O&M Manual
Rev-H (6/19)
*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 20 below for a visual description of a typical control relay application.
Figure 20 - Control Relay Example
If Relay A Mode is set to Alarm Mode,
AL
, then the following settings will
appear in the Config Menu list automatically. In this mode, two setpoints
can be selected on the same relay, to create an alarm band. Phase HI
selection causes the relay to energize outside of the band, and Phase LO
causes the relay to energize inside of the band. This feature enables one
relay to be used as a control relay while the other is used as a HI-LO Alarm
relay at the same time. Setpoint A-LO must be set lower than Setpoint A-
HI. When AL mode is first selected, Setpoint A-LO is defaulted to 0.
21 is a visual description of a typical alarm relay application.
*Setpnt A-HI
*Hyst A-HI
*Delay A-HI
*Setpnt A-LO
*Hyst A-LO
*Delay A-LO
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
