Hydraulic Micro Levelling Drive MD
4Pages

{{requestButtons}}

Catalog excerpts

Hydraulic Micro Levelling Drive MD - 1

Hydraulic Micro Levelling Drive EN ISO 9001 For Hydraulic Elevators The Blain Micro Drive for hydraulic elevators consists of a small motor, pump and valve unit in one assembly. Exact floor stops and relevelling operations are achieved with low electrical power requirement, low noise levels and no unnecessary heating of the oil. The MD unit is mounted on or under the cover of the main hydraulic power unit, using the same oil source. It can also be used to slowly move the car independently of the main drive during installation or in an emergency. For Traction Elevators The Micro Drive is equally effective as a separate unit for accurate relevelling of traction elevators, where a small cylinder is integrated into the cable suspension. This eliminates the need to start the main drive when the car needs to be moved only a few centimetres. Micro Levelling Speeds Micro levelling at approximately 1 cm/s (2 fpm) is recommended at which speed positioning of the car is highly accurate and the relevelling movement, usually lasting less than a second, is barely if at all noticeable by the passenger. Floor stopping accuracy of better than ± 5 mm (0.2 inch) can be expected, provided the floor switch system is correspondingly accurate. Outside of 2 cm (0.8 inch) from the floor landing, the main elevator relevelling system must be activated. Increased safety Exact landing of the car eliminates the danger of passengers tripping while entering or leaving the car. Faster Floor to Floor Times Because the Micro Drive assures final stopping accuracy, the main levelling approach speed to the floor can be increased to approximately 10 cm/s (20 fpm) to shorten travelling time. Quicker Relevelling When a load is added to or removed from the car causing it to shift its position, the MD Unit relevelling correction begins instantaneously and usually taking less than one second to complete. There is no unwanted delay due to bypassing of oil as it is the case with the main hydraulic drive. Quieter Relevelling Since the main power unit does not need to be started, relevelling with the Micro Drive unit is quiet and shorter in duration than when employing the main hydraulic drive. This is especially important in private homes or offices, where the relevelling sound of the main elevator drive can be disturbing; especially at night-time. TM & ST: Do not use hydr. fittings. Use only low pressure pipe screwed in directly. Blain Hydraulics GmbH Pfaffenstrasse 1 74078 Heilbronn Germany Designer and Manufacturer of the highest quality control valves & safety components for hydraulic elevators

Open the catalog to page 1
Hydraulic Micro Levelling Drive MD - 2

Hydraulic Micro Levelling Drive Hydraulic Circuit BV ZM VM Control Valve Solenoid Down Down Speed Adjustment Pressure Relief Valve Adjustment Check Valve Shut Off Valve Suction Tube Cylinder Connection Return Connection MD-Motor MD-Pump Pilot Operated Relief Valve Pilot Operated Down Valve Selection Chart 50 Hz Motors (For 60 Hz connection, add 20% to pump flow rates and MD levelling speeds) Pump Flow Rates 2,0 ¾" Recommended max. micro levelling speed ⅝" Micro Levelling Speed of car cm/s Recommended MD Speed Range Recommended min. micro levelling speed Single Ram Diameter (or Equivalent)...

Open the catalog to page 2
Hydraulic Micro Levelling Drive MD - 3

Hydraulic Micro Levelling Drive Lower Floor Level Main Motor 1. At the beginning of a normal up run, the friction of the system (stiction) is overcome by the Micro Drive. This reduces any breakaway jerk. 2. The standard control valve levelling speed no longer determines the stopping accuracy of the elevator. Therefore it can be increased to approximately 10 cm/s (20 fpm), effectively smoothing out the ride and at the same time, shortening the floor to floor travelling time. 3. The stopping accuracy of the car, determined by the Micro Drive, is improved to less than 5 mm (0,2 inch) from floor...

Open the catalog to page 3
Hydraulic Micro Levelling Drive MD - 4

Hydraulic Micro Levelling Drive Installation and Parts List Warning: Only qualified personnel should adjust or service valves. Unauthorised manipulation may result in injury, loss of life or damage to equipment. Prior to servicing internal parts, ensure that the electrical power is switched off and residual pressure in the valve is reduced to zero. Use the same oil reservoir for the MD unit as for the main pump drive. Do not use hydraulic fittings for suction and return lines. Their smaller bores, prevent efficient oil flow. For the suction line, use low pressure, taper threaded tube, screwed...

Open the catalog to page 4

All Blain Hydraulics GmbH catalogs and technical brochures