3. Use the front panel controls to set the correct output voltage (page 9) and the rate
(page 11).
4. The 977CM will now continuously adjust the balance of the output to attain the
most accurate neutralisation of charge possible.
Feedback Alarm
The feedback system features an alarm that indicates when the system is not
neutralising charge within preset limits. The alarm is triggered when the bargraph
reaches full scale either positive or negative.
The sensitivity of the alarm points can be reduced or increased by altering the
Feedback Gain (page 15). Setting a high gain value will increase the sensitivity of the
system and trigger the alarm at relatively low voltage on the material.
The use of a model 983V2 static locator allows the selection of an appropriate
Feedback Gain setting. Comparing actual readings of voltage on the material with the
bargraph will provide an approximate calibration of the system.
When an alarm condition is met, the alarm relay will change state and the internal
buzzer will sound. To alert the operator that the static levels have exceeded the
desired maximum, the alarm state is maintained until the system is reset.
20
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