32
Setting the Balance
The output of the 977CM can be biased to negative or positive. The adjustment changes the percentage of time that
each HT output is switched on. The maximum bias is 80% to either positive or negative.
Changing the balance of the output changes the relative amount of positive and negative ions produced by the
ioniser. With the help of a static locator the balance can be adjusted for more accurate neutralisation of the target
material.
To set the balance:
1. Press
to enter menu
2.
Select option 3 “Balance” and press
3.
Use the up and down button to change the value
4. Press
to store the setting
Setting the Alarm Point
The 977CM features an adjustable alarm that will alert the operator when the Ion Output of the ionising system falls
below a desired level or when a system fault is detected.
As the ionisers become contaminated, the 977CM increases the output voltage to maintain maximum Ion Output.
When the maximum voltage has been reached and the ionisers become further contaminated, the Ion Output will
slowly start to decrease and will reduce the system’s performance. At this point the ionisers need cleaning.
To alert the operator to the need for cleaning, the 977CM will trigger an in-built audible alarm and the LCD screen
will flash on and off. A remote alarm can also be triggered using the alarm relay connections on the output socket.
The alarm point is set as a percentage of maximum Ion Output. An initial value of 60% is recommended.
To set the Alarm Point.
1. Press
to enter menu
2.
Select option 4 “Alarm” and press
3.
Use the up and down button to change the value
4. Press
to store the setting
+
V
Time
_
50% Positive / 50% Negative
+
V
Time
_
20% Positive / 80% Negative
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