ABB Mechanism HMB-8 User Manual

34 pages

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Instructions for the

HMB-8 / HMB-8.7

(formerly HMB-11)

Mechanism

641P026-008

ABB

ABB Inc.

Westmoreland Distribution Park East

100 Distribution Circle

Mount Pleasant, PA 15666

www.abb.com

www.abbhvsg.com

Table of Contents3
Introduction6
Description6
Hydraulic Elements6
Principles of Operation7
CLOSE Operation7
OPEN Operation7
Over-Pressure Relief Device7
Mechanism Maintenance7
Pre-Maintenance Procedures9
Placing the Mechanism out of Service9
Manually Operating the Operating Mechanism9
Slow Switching Operations9
Deactivating the Close-Position Interlock9
General Maintenance Practices9
Mechanism Seals9
Hydraulic Oil and Service Life9
Limits on Pump Motor Operation10
General Maintenance Procedures10
Checking the Hydraulic Oil Level10
Valve) and Filter10
4.3.3.1 Replacing the Pump Element10
Replacing the Open and Close Pilot Valves11
Evacuating the Mechanism11
Refilling the Mechanism with Oil12
Topping off a Mechanism with Hydraulic Oil12
4.3.6.2 Refilling a Mechanism that Has Been Drained12
Replacing the Pump Motor13
Leak Checking the Hydraulic System13
Spring Travel Limit Switch Settings14
Manual Operation14
Adjusting the Opening Closing Velocities15
Adjusting the Onboard Auxiliary Switches15
Manually Charging the Operating Mechanism16
Troubleshooting18
Figure 121
HMB-8 Hydraulic Operating Mechanism (Cross-Cut Views)21
Figure 1B23
HMB-8 Hydraulic Operating Mechanism (External Views)23
Figure 325
Figure 426
Mechanical Switch26
Figure 527
Pump with Motor27
Figure 628
Measurement of Spring Tension28
Figure 729
Bottom Side of Working Piston29
Figure 830
Pilot Valve Assembly30
Figure 931
Figure 1032
Auxiliary Switch Drive Arm32

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ABB Mechanism HMB-8 Specifications

General

Brand	ABB
Model	Mechanism HMB-8
Category	Circuit breakers
Language	English

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Table of Contents

Questions and Answers:

ABB Mechanism HMB-8 Specifications

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