Hach-Lange HACH 5500 sc PO43-LR Operations - Manual (Page 13)

Option Description
SET FUNCTION Selects a function. ALARM—The relay starts when the
upper or lower alarm value is triggered. FEEDER
CONTROL—The relay shows if a process value is larger
or falls below a setpoint. EVENT CONTROL—The relay
toggles if a process value reaches an upper or lower
limit. SCHEDULER—The relay switches at certain times
independently of any process value. WARNING—The
relay shows warning and error conditions in probes.
SET TRANSFER Selects active or inactive.
FAIL SAFE Selects yes or no.
Relay activation options
1. Select SETUP SYSTEM>SETUP OUTPUTS>RELAY SETUP.
2. Select the applicable relay.
3. Select ALARM in the FUNCTION menu and then select the
applicable options in the ACTIVATION menu.
Option Description
LOW ALARM Sets the value to set the relay to on in response to the
decreasing measured value. For example, if the low alarm
is set for 1.0 and the measured value drops to 0.9, the
relay starts.
HIGH ALARM Sets the value to set the relay to on in response to the
increasing measured value. For example, if the high alarm
is set for 1.0 and the measured value increases to 1.1, the
relay starts.
LOW
DEADBAND Sets the range where the relay stays on after the
measured 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 stays on between
1.0 and 1.5. The default is 5% of the range.
HIGH
DEADBAND Sets the range where the relay stays on after the
measured 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 stays on between
3.5 and 4.0. The default is 5% of the range.
Option Description
OFF DELAY Sets a delay time (0–300 seconds) to set the relay off
(default = 5 seconds).
ON DELAY Sets a delay time (0–300 seconds) to set the relay on
(default = 5 seconds).
4. Select FEEDER CONTROL in the FUNCTION menu and then select
the applicable options in the ACTIVATION menu.
Option Description
PHASE Specifies the relay status if the process value is larger
than the setpoint. HIGH(default)—sets the relay to on
when the process value is larger than the setpoint. LOW
—sets the relay to on when the process value falls below
the setpoint.
SET SETPOINT Sets the process value for the relay to toggle between the
high and low value (default = 10).
DEADBAND Sets a delay so that the relay will be stable as the
process value converges to the setpoint.
OVERFEED
TIMER Sets the maximum amount of time to get to the process
setpoint. When the time expires and the relay does not
show the setpoint, the relay is set to off. After an overfeed
alarm occurs, reset the timer manually.
OFF DELAY Sets a delay time to set the relay to off (default =
5 seconds).
ON DELAY Sets a delay time to set the relay to on (default =
5 seconds).
5. Select EVENT CONTROL in the FUNCTION menu and then select
the applicable options in the ACTIVATION menu.
Option Description
SET SETPOINT Sets the value to set the relay to on.
DEADBAND Sets a delay so that the relay will be stable as the process
value converges to the setpoint.
OnMax TIMER Sets the maximum time the relay stays on (default =
0 min).
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