Hach 5500sc Operations page 14

Relay setup
1. Push menu and select SETUP SYSTEM>SETUP OUTPUTS>RELAY SETUP.
2. Select the relay.
3. Select an option.
Option Description
ACTIVATION The menu list items change with the selected function. Refer to
on page 14 for more information.
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.
PROCESS EVENT—The relay switches when the analyzer does a specified operation.
SET TRANSFER Selects active or inactive.
FAIL SAFE Selects yes or no.
Relay activation options
1. Push menu and 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
LOW ALARM
HIGH ALARM
LOW DEADBAND Sets the range where the relay stays on after the measured value increases above the
HIGH DEADBAND Sets the range where the relay stays on after the measured value decreases below the
OFF DELAY
ON DELAY
4. Select FEEDER CONTROL in the FUNCTION menu and then select the applicable options in the
ACTIVATION menu.
Option
PHASE
SET SETPOINT
DEADBAND
14 English
Description
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.
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 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 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.
Sets a delay time (0–300 seconds) to set the relay off (default = 5 seconds).
Sets a delay time (0–300 seconds) to set the relay on (default = 5 seconds).
Description
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.
Sets the process value for the relay to toggle between the high and low value (default =
10).
Sets a delay so that the relay will be stable as the process value converges to the
setpoint.
Relay activation options