Hach sc200 User Manual page 27

9. Test the relay function to make sure it is properly energizing the
connected device. Relay testing is performed through the Test/Maint
option of the Settings menu.
• Scheduler Function
Option Description
Hold outputs Holds outputs in the present ON or OFF state.
Run days Sunday, Monday, Tuesday, Wednesday, Thursday, Friday,
Saturday
Start time Sets the start time
Interval Sets the time between activation cycles (Default value: 5 min)
Duration Sets the period of time the relay is energized (Default value:
30 sec)
Off delay Sets the time for additional hold/output time after the relay has
been turned off
• Alarm function
Option Description
Low alarm Sets the value where the relay will turn on in response to
decreasing measured value. For example, if the low alarm is
set for 1.0 and the measured value drops to 0.9, the relay
activates.
High alarm Sets the value where the relay will turn on in response to
increasing measured value. For example, if the high alarm is
set for 1.0 and the measured value increases to 1.1, the relay
activates.
Low Sets the range where the relay remains on after the measured
deadband value increases above the low alarm value. For example, if
the low alarm is set for 1.0 and the low deadband is set for 0.5,
the relay remains on between 1.0 and 1.5. Default is 5% of the
range.
Option Description
High Sets the range where the relay remains on after the measured
deadband value decreases below the high alarm value. For example, if
the high alarm is set for 4.0 and the high deadband is set for
0.5, the relay remains on between 3.5 and 4.0. Default is 5%
of the range.
Off delay Sets a time (0-300 seconds) to delay the relay from normally
turning off.
On delay Sets a delay time for the relay to turn on (Default: 5 seconds)
• Feeder Function
Option Description
Phase Defines the relay status if the process value exceeds the
setpoint.
High (default)—turns the relay on when the process value
exceeds the setpoint.
Low—turns the relay on when the process value falls below
the setpoint.
Set setpoint Sets the process value at which the relay toggles (Default
value: 10)
Deadband Sets a hysteresis so the relay will not swing unregulated
when the process value converges to the setpoint.
Overfeed timer Sets a time period for de-activating an active relay if the
process setpoint cannot be reached. Once an overfeed
alarm is present, it must be manually reset.
Off delay Sets a delay time for the relay to turn off (Default: 5 seconds)
On delay Sets a delay time for the relay to turn on (Default: 5 seconds)
• Event Control
Option Description
Set setpoint Sets the value where the relay will turn on
English 25