The ALBA MC250 is a material hoist designed for temporary installation on construction sites, facilitating the lifting and lowering of materials and scaffolding components. It operates on a rack and pinion mechanism, driven by a geared motor, and is guided vertically along a mast rack with support rollers. The machine is intended for use by skilled and authorized personnel, emphasizing safety and ease of installation.
Function Description:
The primary function of the MC250 is to transport loads vertically in a fast and safe manner. It is specifically designed for materials and scaffolding components, not for persons. The hoist is fixed at suitable intervals to a load-bearing structure, such as scaffolding or building slabs. Operation is controlled via a portable push-button panel, which requires the operator to maintain visual access to the entire hoist railway. An emergency descent lever is provided for power failures, and a safety device (FPC-500 parachute) is integrated to mechanically lock the hoist if its speed exceeds a predetermined value during a fall.
Important Technical Specifications:
- Dimensions (Standard Carrier): 900 x 500 x 900mm (35.43 x 19.68 x 35.43 in)
- Dimensions (Carrier for Scaffold Parts): 900 x 500 x 1800mm (35.43 x 19.68 x 70.86 in)
- Maximum Capacity: 250kg (550 lb) for both standard and scaffold carriers
- Vertical Speed: 20 m/min (65 ft/min)
- Motor: 3 phase 1.5kW 230V 50/60Hz
- Maximum Height: 30m (98 ft 5.1 in)
- Distance between Anchorages (max.): 3m (9 ft 10.11 in)
- First Anchorage (approx.): 1m (3 ft 3.37 in)
- Noise Emission Value: > 70dB
- Temperature Range for Use: -15°C ÷ 45°C (5 ÷ 113°F)
- Relative Humidity: 30% - 90%
- Max. Altitude for Installation: 1000m (0.62 mi)
- Max. Wind Speed (Service): 55 km/h (34 mi/h)
- Max. Wind Speed (Assembly): 45 km/h (28 mi/h)
- Max. Wind Speed (Out of Service): 130 km/h (80 mi/h)
Safety Devices:
The MC250 includes several safety features:
- Gearmotor with electromechanical brake: Included
- Overspeed parachute with auto-recovery system (FPC-500): Included, designed to activate if speed exceeds a set value during a fall.
- Emergency lowering lever: Included, for controlled descent during power failure.
- LED for fault detection: Included
- Buffers at the ground base: Included
- Superior endtrack buffers: Included
- Superior / Inferior endtrack limit switch: Included
- Safety endtrack limit switch: Included
- Mast presence detector: Included
- Emergency stop: Included
- Kit for installation of 3 intermediate stops in mast: Optional
- Base frame enclosure: Optional
Usage Features:
- Installation: Requires qualified and authorized personnel. Protective equipment against falls from height (EN 358:2018, EN361:2002, EN364:1993) and a protective helmet (EN397:2012) are mandatory.
- Ground Support: The installation site must be capable of supporting the hoist's total load (static and dynamic), which varies with height.
- Electrical Connection: Requires a 208V 60Hz supply with 16A thermal protection and 300mA differential protection. A 3x2.5 mm² cable, max 30m (98 ft 5.1 in), should be connected directly to the supply point without other machines to avoid voltage faults.
- Base Machine Placement: The MC250 has a front leg for stability. The base is fixed to the ground using anchoring spits, ensuring the mast is vertical and parallel to scaffold tubes. First anchorage to the structure should be at approximately 1m (3 ft 3.37 in) if ground anchoring is not possible.
- Mast Column Erection: Masts are joined using T-shaped screws with notched nuts to prevent loosening. Screws must be tightened with a scaffolding assembly ratchet wrench. The upper endtrack cam and travel stop must be positioned on the last mast before placement. The top of the MC250 should never protrude more than 250mm (9.84 in) from the last anchor.
- Anchoring: Various anchorage types are available (L-type, H-type, special fixed, special extensible) depending on the wall configuration and distance from the mast. The first external anchor must be placed at a maximum distance of 2m (6 ft 6.74 in).
- Cage Assembly: Cages have four lashing points to the chassis. Pins connecting the cage to the chassis must be perfectly closed.
- Cable Management: Cable holders and guides ensure the cable is aligned and rolls up perfectly, without interference from moving parts.
- Access Protection: Ground level access for loading must have vertical protection (h = 1.1-1.2m / 43.30-47.24 in) and an intermediate rail (no more than 0.5m / 19.68 in vertical distance). Vertical hoist travel areas must be protected to prevent falls from height greater than 2m (6 ft 6.74 in).
- Forbidden Uses: Do not use on explosive atmospheres, with loads exceeding capacity, with loads piled outside the cage floor bounds, to transport loads out of the cage, in adverse weather, by personnel in unacceptable physical condition, with non-original spare parts, without necessary personal protection gear, without a differential switch, or for transporting people.
- Emergency Descent: The operator must move the lever smoothly to ensure a slow descent; exceeding the parachute activation speed will cause it to lock.
Maintenance Features:
- Daily Maintenance: Performed by the hoist's responsible person, includes visual inspection of protections, absence of ice/snow/rubbish, rack/mast wear, load plate presence, delimited ground zone, absence of warped/cracked parts, electrical wire integrity, guide roller condition, power line clearance, facade element interference, electrical safety device operation, emergency stop function, anchorage correctness, rack-pinion engagement, control board condition, and cable travel.
- Periodic Maintenance Schedule:
- 40h work or monthly: Check upper/lower stop cams, mast detector (distance ±5mm / 0.19 in), gearmotor oil level, pushbutton/warning lights, mast tube (wear/erosion/welding), motor brake rectifier (output voltage), communication cable, guide rollers (visual check), anchorage (interference), base buffers, mast rack, gearmotor pinion (lytic fat), and parachute pinion (lytic fat).
- Quarterly (4 times/year): Tighten mast connecting bolts (use fixed keys) and screws for all structure anchors.
- Annual or after disassembly: Measure guide rollers dimension (with caliper), rack dimension (with caliper), gearmotor pinion string (with micrometer), and motorbrake airgap (with gauges).
- After disassembly or after periods of non-use: General inspection for deformation/damage of masts, anchorages, doors/handrails/floors. Check rectifier, voltage, and coil of gearmotor and brake.
- Parachute Drop Test: Required at the end of each assembly and periodically every 4 months. The hoist is raised approximately 1.5m (4 ft 11.05 in), and a cable tied to the brake lever is pulled diagonally to activate the parachute. The operator must not be within reach of the forklift. If the parachute does not activate, the test must be stopped and repeated with increased height. The result must be recorded in the maintenance log.
- Parachute Check and Replacement:
- Installation: Test run.
- 4 years later: Send parachute to manufacturer for revision and calibration.
- 8 years later: Send parachute to manufacturer for revision and calibration.
- 12 years later: Replace the hoist parachute. After replacement, a test must be performed and recorded.
- Troubleshooting: A detailed table provides probable causes and solutions for common issues such as hoist not running, abnormal noise, sliding down, motor not starting, abnormal vibrations, and various drive errors.
- Safety during Maintenance: Before any maintenance, disconnect power, block cabin movement on the rack, and ensure a minimum clearance of 1.8m under the lift. Maintenance tasks must be performed WITHOUT LOADS. Electrical equipment should only be handled by authorized personnel.
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