Page 246 - Water Standards
P. 246
Table 4 2 7-3 (Continue)
No Item Allowable error Explanation
2 Elevation ±5 0mm —
For electro⁃hydraulic type,
measure the base of the electro⁃hy⁃
Mechanical cabinet draulic conversion device; for me⁃
3 0 15mm/ m
levelness chanical hydraulic type, measure the
bottom plate of the pendulum electric
motor (the upper diaphragm)
Emergency distribu⁃
Measure the foundation plate of the
4 tion valve verticality 0 15mm/ m
emergency distribution valve
or levelness
Electrical cabinet Measure by lead weigh in the X
5 1 0mm/ m
verticality and Y directions
Note: During the installation of combined speed controllers, the supports of the speed
controlling shaft s transmission mechanism shall be taken as datum and the devia⁃
tion shall meet the design requirements
8 Governors which need to be dismantled shall meet the following requirements:
1) For mechanical hydraulic parts which need to be dismantled in the electro⁃hydrau⁃
lic governor, component cleaning, assembly and adjustment shall meet the re⁃
quirements of the manufacturer drawings.
2) The cleaning, assembly and adjustment of the mechanical governor components
shall meet the following requirements:
—The connection of the pendulum electric motor and centrifugal pendulum shall
be concentric and be able to rotate freely. The radial and axial throw of the dia⁃
mond centrifugal pendulum spring seat relative to the steel belt upper support
shall be no larger than 0 04mm.
—When the buffer piston moves up and down and returns to the middle position,
the time spent in the last 1mm shall meet the design requirements. The differ⁃
ence between the upward and downward returning times shall be no larger than
10% of the setting time.
—If the permanent speed droop (residual degree of unbalance) is indicated to be
2 3 9