Advanced Operations

6.3.3 Relay menu

Note: This menu appears only if a relay card is installed in the sc1000 controller.

The relay menu content for a relay card depends on the selected working mode. There are several relay card working modes:

ALARM

Relay controls if a process value is between two limits.

FEEDER CONTROL

Relay indicates if a process value exceeds or falls below a set point.

2 POINT CONTROL

Relay toggles if a process value reaches an upper or lower limit.

WARNING

Relay indicates warning and error conditions in probes.

PWM CONTROL

Relay uses a Pulse-Width-Modulation control depending on a process value.

FREQ. CONTROL

Relay switches in a frequency depending on a process value.

TIMER

Relay switches at certain times independently of any process value.

SYSTEM ERROR

Relay indicates if any probe in the system has an internal error, warning or is missing.

6.3.3.1 General relay settings (available in all relay working modes)

SYSTEM SETUP

RELAY

RELAY INT/EXT

Select RELAY card 1, 2, 3 or 4

 

 

 

Default value: No source

 

SELECT SOURCE

Select a probe or create a formula which delivers the process value that is processed by the

 

 

 

relay card.

 

 

 

Default value: No parameter

 

SET PARAMETER

Select a parameter of the selected source.

 

Displayed parameter depend on the connected sc probe, for example oxygen concentration or

 

 

 

 

 

 

temperature.

 

 

 

 

 

 

 

Default value: INPUT CONFIG

 

DATA VIEW

Sets the value which is shown as the measured value in the display module and logged into the

 

 

 

data logger.

 

 

 

 

 

 

RELAY CONTACT

Displays and logs the status of the relay contact (ON or OFF).

 

 

 

 

 

 

INPUT CONFIG

Process value read from the selected source after it has been processed by the internal formula

 

 

parser (if prompted).

 

 

 

 

SET FUNCTION

Default value: ALARM

 

Sets the relay card working mode.

 

 

 

 

 

 

 

 

 

ALARM

Operates relays in response to the measured parameter. Contains separate High and Low Alarm

 

 

points, deadbands, and ON/OFF delay.

 

 

 

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Hach sc1000 user manual Advanced Operations Relay menu, General relay settings available in all relay working modes