Hach-Lange SC 60 - Manual (Page 40)

36
Operation
RELAY SETUP (continued)
FAILSAFE
Allows the user to create a state where the normal condition is energized. The relay is
de-energized when an error condition is experienced. Select YES (Energized) or NO
(De-energized) and press
ENTER . YES sets the relay normal condition to energized resulting in
the relay becoming de-energized when an error condition is experienced.
ACTIVATION
Function set to ALARM
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
will be activated.
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 will be activated.
LOW DEADBAND—Sets the range where the relay remains on after the measured value
increases above the low alarm value. Default is 5 % of the range. For example, if the low alarm is
set for 1.0 and the low deadband is set for 0.5, then the relay remains on between 1.0 and 1.5.
HIGH DEADBAND—Sets the range where the relay remains on after the measured value
decreases below the high alarm value. Default is 5 % of the range. For example, if the high alarm
is set for 4.0 and the high deadband is set for 0.5, then the relay remains on between 3.5 and 4.0.
OFF DELAY—Sets a time (0–300 seconds) to delay the relay from normally turning off.
ON DELAY—Sets a time (0–300 seconds) to delay the relay from normally turning on.
Function set to FEEDER CONTROL
PHASE—“High” phase assigns the relay setpoint to respond to an increasing measured value;
conversely, a “Low” phase assigns the relay setpoint to respond to a decreasing measured value.
SET SETPOINT—Sets the value where the relay will turn on.
DEADBAND—Sets the range where the relay remains on after the measured value decreases
below the setpoint value (high phase relay) or increases above the setpoint value (low phase
relay).
OVERFEED TIMER—Sets the time (0–999.9 minutes) to limit how long the relay can remain on.
OFF DELAY—Sets a time (0–999 seconds) to delay the relay from normally turning off
ON DELAY—Sets a time (0–999 seconds) to delay the relay from normally turning on.
Function set to EVENT CONTROL
SET SETPOINT—Sets the value where the relay will turn on.
DEADBAND—Sets the range where the relay remains on after the measured value decreases
below the setpoint value (high phase relay) or increases above the setpoint value (low phase
relay).
OnMax TIMER—Sets the time (0–999 minutes) to limit the time the relay can remain on.
OffMax TIMER—Sets a time (0–999 minutes) to delay the relay from normally turning off.
OnMin TIMER—Sets the time (0–999 minutes) to limit the time the relay can remain on.
OffMin TIMER—Sets the time (0–999 minutes) to limit the time the relay can remain off.
Function set to TIMER (RTC selected in SELECT SOURCE)
HOLD OUTPUTS—Set OUTMODE to select output hold operation and select channels that
cause the outputs to be held.
INTERVAL—Set the off time for the relay.
DURATION—Set the on time for the relay.
OFF DELAY—Set the time for additional hold/output time after the relay has been turned off.
4.9 System Setup Menu (continued)