ATI
Q45D/60 Dissolved Oxygen System
Part 5 – Configuration
O & M Manual
Revision C (7/09)
42 -
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.
Figure 6-4 is a visual description of a typical alarm relay
application.
Figure 5-4 Alarm Relay Example
If Relay B Mode is set to
CON
, then Relay B will function
identically to Relay A. Relay B settings appear in the
CONFIG menu list automatically.
Setpoint A-HI: 1.000 ppm
Setpoint A-LO: .500 ppm
Hyst
A-HI: 0.050
Hyst
A-LO: .0.050
Delay
A-HI: 000
Delay A-LO: 000
When value rises to
≥
1.000 ppm, relay
closes, until value falls back to < 0.950 ppm.
Settings:
When value falls to < 0.500 ppm, relay
closes, until rises back to > 0.550 ppm.
When value rises to
≥
0.500 ppm, relay
closes, until value falls back to < 0.450 ppm.
When value falls to < 1.000 ppm, relay
closes, until rises back to > 1.050 ppm.
*Setpnt A-HI
*Hyst A-HI
*Delay A-HI
*Setpnt A-LO
*Hyst A-LO
*Delay A-LO
*B Setpoint
*B Hysteresis
*B Delay
*B Phasing
}
}
1.000 ppm
0.950 ppm
0.550 ppm
0.500 ppm
PHASE: HI
ON
HYST - HI
HYST - LO
ON
X
X
OFF
}
}
1.050 ppm
1.000 ppm
0.500 ppm
0.450 ppm
PHASE: LO
OFF
HYST - HI
HYST - LO
OFF
X
X
ON
