Hach SC4500 User Manual page 38

Timer function
Option
Outputs on hold
Relay off-time
Duration unit
DURATION
Timer off delay
Duty cycle
Relay contact
status
Next toggle
System error function
Option
Warning list
Error list
Sensor is missing.
Timer on delay
Timer off delay
Relay contact status
4. Push OK to apply the changes.
5. Push the main menu icon, then select Outputs > High voltage relay > Test/Maintenance.
The Test/Maintenance menu lets the user do a test of the internal high voltage relays.
6. Select an option.
Option Description
Function test Does a test on the selected relay.
Set the Relay 1, Relay 2 or All to ON or OFF for the test.
Output mode does a test on the relay output. Options: Hold (default), Active or Transfer.
Relay status Shows the condition of the relays.
36 English
Description
Lets the relay put a mark on the sensor configured in the menu SENSOR at the
DURATION time. Other expansion modules such as other relay cards or current output
cards which access data of this sensor read this 'mark' and go into hold. To go into hold
means the accessing module does not read the latest measurement from the marked
sensor but works with the last measurement read before the sensor was marked. To
activate this function set this menu to YES. If the sensor will never let other expansion
modules go into hold, set this menu to NO.
Note: The setting Outputs on hold always adapts to the DURATION time.
Sets the period of time to set OFF the relay in one duty cycle (provided the Duty cycle
option is set to Direct control).
Sets the units for the DURATION setting.
Sets the period of time for setting ON the relay in one duty cycle (provided the Duty cycle
option is set to Direct control).
Delays the check mark of a probe even if DURATION time has expired. The Timer off
delay starts immediately after the DURATION time is expired. This setting only takes
effect if Outputs on hold is set to YES.
Direct control—Sets the relay ON for the time set in the DURATION menu. Sets the relay
OFF for the time set in the Relay off-time menu.
Reverse—Sets the relay OFF for the time set in the DURATION menu. Sets the relay ON
for the time set in the Relay off-time menu.
Displays and logs the status of the relay contact (ON or OFF).
Shows the seconds until the relay will toggle.
Description
Enabled—Monitors the internal warning bits of every probe.
Disabled—Monitoring is disabled.
Enabled—Monitors the internal error bits of every probe.
Disabled—Monitoring is disabled.
Enabled—Monitors the connection of every connected probe.
Disabled— Monitoring is not active.
Sets a delay for the relay to set ON.
Sets a delay for the relay to set OFF.
Displays and saves to the log the status of the relay contact (ON or OFF).