Hach Polymetron 9500, Руководство пользователя, Страница: 31 / 50

Option Description
PWM CONTROL Relay uses a PWM (Pulse Width Modulation) control depending on a
process value
FREQ CONTROL Relay switches with a frequency depending on a process value
WARNING Relay indicates warning and error conditions in sensors
6. From the RELAY SETUP menu, select SET TRANSFER and choose ACTIVE or INACTIVE.
7. From the RELAY SETUP menu, select FAIL SAFE and choose YES or NO.
8. From the RELAY SETUP menu, select ACTIVATION. The activation options for the selected
function appear.
9. Test the relay function to make sure it is properly energizing the connected device. To do relay
testing, Push the
menu key and select TEST/MAINT>TEST RELAY.
• Scheduler function (refer to Figure 16 )
Option Description
HOLD OUTPUTS Holds outputs in the present ON or OFF state
RUN DAYS Sets the weekday(s) that the relay operates.
START TIME Sets the start time.
INTERVAL Sets the time between activation cycles (default value: 5 min).
DURATION Sets the period of time the relay is energized (default value: 30 sec).
OFF DELAY Sets the time for additional hold/output time after the relay has been turned off.
Figure 16 Scheduler function
1 Duration 3 Interval
2 OFF delay 4 Time (x-axis)
• Alarm function (refer to Figure 17 )
Option Description
LOW ALARM Sets the value where the relay will turn on in response to decreasing measured value.
For example, if the low alarm is set for 1.0 and the measured value drops to 0.9, the
relay activates.
HIGH ALARM Sets the value where the relay will turn on in response to increasing measured value.
For example, if the high alarm is set for 1.0 and the measured value increases to 1.1,
the relay activates.
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