Walchem WebMaster Manuel d'instructions télécharger pdf (Page 122)

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Power-up Alarm Delay Time

In order to avoid being notified of an alarm condition that is only present because the system is

just powering up, you set a delay time for the alarm action. If the alarm condition still exists at the

end of the delay time, then the alarm relay will activate. If the alarm condition no longer exists at

the end of the delay time, no notification will occur. Any value between 0 and 1440 minutes is

acceptable.

If this Relay is a Dry Contact

Use this section if the relay board installed in this controller has a dry contact relay in the position

of the relay being programmed as an alarm. If you look at the relay board, find the relay number

you are programming as the alarm, and if it has terminals labeled NC and COM, it is dry contact.

Click on the radio button that describes how you want the alarm relay to act. The normal method is

to close the relay when an alarm condition exists, but you can also open the relay.

If this Relay is Internally Powered

Use this section if the relay board installed in this controller has an internally powered relay in the

position of the relay being programmed as an alarm. If you look at the relay board, find the relay

number you are programming as the alarm, and if it has terminals labeled NC and NO, it is

internally powered.

Click on the radio button that describes how you want the alarm relay to act. The normal method is

to energize the NO (normally open) terminal when an alarm condition exists, but you can also

energize the NC (normally closed) terminal.

Mutual Interlocks

Click the check boxes to select or de-select the relays and analog output control outputs that you

want to be prevented from turning ON if this output relay is already ON. If you do not need any

other output to shut off when this relay turns on, UNCHECK all boxes. The selection is mutually

exclusive, meaning that if Relay 2 has Relay 4 interlocked, then R2 won’t turn on if R4 is already

on, and R4 won’t turn on if R2 is already on. This feature should be used with caution since it can

potentially delay a chemical addition for a long time.

Output Time Limit

Type in the text box the maximum amount of time that the relay can be continuously activated

before the controller deactivates the relay and activates an Output Time Limit alarm. This is

intended to prevent the output from running out of control if the input fails in such a way that it

will never deactivate the relay. Any value between 0 and 1440 is acceptable. A value of 0 means

the relay can be left on indefinitely.

Note that the relay will not activate again until someone resets the timer!

It will take some experience to find out what the normal output on-time will be. If the relay cycles

open and closed under worst case conditions in 30 minutes, you may want to set the Output Time

Limit at 60 minutes.

Output Mode

Click on the radio buttons to manually control the alarm relay. The normal selection will be Auto,

where the controller uses the various set points to open and close the relay. You can force the relay

open regardless of the presence of an alarm condition by selecting Off, or force the relay closed

regardless of the presence of an alarm condition by selecting Hand.

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Walchem WebMaster Manuel d'instructions Page 122

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