Hach SC4500 User Manual page 34

Option Description
Function Sets the function value. Setup options change based on the selected function.
• Alarm—Operates the relays in response to the measured parameter.
• Feeder control—Operates the relays in response to the measured parameter.
• 2 point control—Operates the relays in response to the measured parameter with two
• Warning—Operates the relays when the controller finds a SC device warning. Shows the
• Pulse width control—Lets the relays give a pulse width modulated output.
• Frequency control—Lets the relays operate in a cyclic manner at a frequency between
• Timer—Lets the relays to operate at set times independently of the process value.
• System error—Shows if a device has an internal error or warning.
Transfer Sets the transfer value. Options: Relay is energized or Relay is de-energized. (default).
Input value Shows the process value read from the selected source after the internal formula parser
sends the process value (if prompted).
Data logger Sets the interval at which the controller saves the shown value to the data logger. Options:
interval OFF (default), 5 minutes, 10 minutes, 15 minutes, 20 minutes or 30 minutes.
3. Complete the settings based on the Function setting.
Alarm function
Option
Phase
High alarm
Low alarm
High deadband
Low deadband
Timer on delay
Timer off delay
Relay contact status Displays and logs the status of the relay contact (ON or OFF).
Feeder control function
Option
Phase
Relay setpoint
Deadband
OnMax TIMER
Timer on delay
Timer off delay
32 English
setpoints.
warning and error condition of the selected devices.
the minimum pulses for each minute and maximum pulses for each minute.
Description
Sets the relay condition when the process value is out of the controlled band.
Options: Direct control or Reverse
Sets the maximum value of the controlled band in the selected parameter unit.
Sets the minimum value of the controlled band in the selected parameter unit.
Sets the hysteresis value used at the upper limit.
Sets the hysteresis value used at the lower limit.
Sets a delay time for the relay to stay on.
Sets a delay time for the relay to stay off.
Description
Sets the relay condition if the process value is more than the setpoint. Options: Value
above the limit or Value below the limit.
Set the process value at which the relay condition changes.
Sets a hysteresis so the relay will not swing unregulated when the process value
converges to the setpoint.
Sets a maximum period of time. During this period the relay stays on when passing the
setpoint. When the time expires, the relay changes to OFF regardless of the process
value.
Sets a delay time for the relay to stay on.
Sets a delay time for the relay to stay off.