4 November 2005
641P026-008
HMB-8 / HMB-8.7 Mechanism
©
(formerly HMB-11)
Page 14
4.3.9
Spring Travel Limit Switch Settings
Notice:
The HMB-8.3 or HMB-8.7 mechanism has O-
CO stored energy. The HMB-8.2 mechanism
has CO-CO stored energy.
4.3.10
Checking the Pump Start Counter
A pump motor start counter is provided in the breaker
control cabinet to keep track of the number of pump starts.
The number of pump starts for any given mechanism will
vary. A significant increase in the average number of pump
starts may indicate internal hydraulic oil leakage.
The average number of pump starts per day will vary. A
maximum average count of 20 operations for pump starts
per day is normal. Should the pump average more than 20
starts a day, check the system for hydraulic oil leakage and/
or contact ABB Service Department.
Five seconds are required to restore the mechanism to full
system pressure from pump start to pump stop when
operating due to slow internal leakage.
5
Manual Operation
DANGER
Do not ever manually operate the
mechanism when the circuit breaker
is energized! Isolate the circuit
breaker from the high voltage sys-
tem before performing any manual
operation.
The HMB mechanism should only be operated manually
when the disc spring assembly 51008 (Fig. 1) is fully
charged and the breaker is at normal operating gas density.
To operate the mechanism manually:
1.
Remove the mechanism cover to access the pilot
valves 51004 and 51005 (Figs. 1 and 8).
2.
Forcefully and quickly press and release the black
button on the respective open or close pilot valve.
Important:
When operating the mechanism manually,
the black button on the pilot valve must be
pushed forcefully and quickly and then re-
leased. Do not press the button gingerly or
hold it down after pressing.
Important:
When reattaching the mechanism cover
51028, torque the cover bolts to 3 Nm.
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Summary of Contents for Mechanism HMB-8
Page 2: ......
Page 5: ...641P026 008 HMB 8 HMB 8 7 Mechanism formerly HMB 11 Page 5 4 November 2005 ...
Page 19: ...641P026 008 HMB 8 HMB 8 7 Mechanism formerly HMB 11 Page 19 4 November 2005 NOTES ...
Page 33: ...641P026 008 HMB 8 HMB 8 7 Mechanism formerly HMB 11 Page 33 4 November 2005 NOTES ...
