SCHUNK WBL 85 Balfour Beatty, Maintenance And Operating Manual

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Pressure Regulator (1) Regulating Screw (2)
10.4 Adjustment of Contact Pressure
The medium contact pressure is 120 N.
After each replacement of carbon strip the contact pressure needs to be verified.
Contact pressure may be measured with a spring scale or with the SCHUNK
Pantograph Contact Pressure Measuring Gauge KM 11.
Measurement of contact pressure with spring balance:
Value 1: Measuring of contact pressure from highest working position with
slow descending motion into resting position.
Value 2: Measuring of contact pressure from resting position with slow
ascending motion into the highest working position.
Results: (Value 1 + Value 2)
2
Friction: Difference of contract pressure between Value # 1 and Value # 2
(ideal value lower than 20 N)
If the difference of the contact pressure is greater than 40 N, determine the reason
(e.g. defective component part, dirt in the bearings, etc.) and have it corrected.
= Average Value = Contact Pressure
The calibration is done by means of the regulating screw (2) at the pressure
regulator (1) on the pneumatic guide system.
Adjust through:
- turning clockwise = increase contact pressure
- turning counter-clockwise = decrease contact pressure
WBL 85-15kV
Adjustment Work
Single Arm Pantograph WBL 85 Balfour Beatty
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