Contact suspension units combine robust construction with simple and reliable operation. When the light is in its raised and operational position the contact suspension unit automatically makes electrical circuits and engages “mechanical lock” consequently relieving the winch, pulleys and wire rope from tension.
Unlocking the unit to lower the light for maintenance automatically breaks electrical circuits therefore no live cables are lowered with the fitting.
Our contact suspension units can accommodate loads from 5KG-560KG with a maximum of 9 electrical contacts + earth feeding the luminaire. Just check out our animated video below to see exactly how the units operate.
Innovative design. Robust construction. Simple, reliable operation.
Contact suspension units are used as part of lighting winch system supplied by Penny Hydraulics Ltd. The units combine robust construction with simple and reliable operation.
- Makes/breaks electrical lighting feed when raising/lowering
- Engages mechanical lock
- No live cables are lowered with the light fitting. Light fitting is fully isolated for maintenance at low level.
- Mechanical lock acts as a secondary support to the light fitting when in upper raised position, consequently relieving the winch, pulleys and wire rope from tension.
Frequently Asked Questions
Electric systems - we offer the option of controlling via either a wireless remote-control handset, a removable handset that plugs into a wall socket, or hard-wired controls mounted to a faceplate.
Manual systems - are operated by manually rotating a hand crank/winch handle. We offer the options of having the handle permanently attached to the body of the hoist, or removable should the hoist need to be tamper proof (eg located in a public area).
We always use wire rope installed on our bespoke and ‘off the shelf’ self-contained winches to suspend the light fitting. The weight of the fitting influences the diameter of the rope used. All rope used is tested and certified. Stainless rope will be
Our electric systems require a domestic single phase 230v 50Hz power supply to power them which is usually provided in the form of a fused spur next to the winch control box location.
Our bespoke winch systems use several component parts to function, depending on their configuration:
The hoist assembly – The hoist assembly consists of a drum for the wire rope to feed onto and an electric motor/gearbox which rotates the drum. If access is difficult, we can often locate the hoist assembly remotely and direct the hoist rope to the main lowering point using pulleys.
Pulleys – Pulleys are used to direct the rope between the hoist assembly and the Contact Suspension Unit. The pulley bodies come is different configurations depending on how the pulley are to be used and where they are to be installed. Also, the size of the wire rope used will determine the size of pulley wheel used.
Contact Suspension Units - When the light is in its raised and operating position the Contact Suspension Unit automatically makes the electrical circuits and engages a “mechanical lock”, consequently relieving the winch, pulleys and wire rope from tension. Unlocking the unit to lower the light for maintenance automatically breaks the electrical circuits therefore no live cables are lowered with the fitting.
Cable Reels - The cable reel pays out the electrical flex to the light fitting as it is lowered to ground level and then automatically retracts the flex when raising the fitting back up to high level. This means that the fitting can remain energised throughout the raising and lowering process.
Hoist control enclosure – The hoist motor uses 3 phase power to run so we use an inverter to convert the domestic 230v power supply feeding the system to 3 phase power that the hoist motor can utilise. The inverter is housed in the Hoist controller enclosure. All the system control circuits feed back to this enclosure. Although it is usually housed close to the winch assembly, this is not essential and can be up to 30m away from the hoist assembly.
No, not at all. With our bespoke systems, the winch can be located remotely to the main lowering point (directly above the light fitting). In fact, it could be located in a completely different part of the building! We would then use a series or pulleys to direct the hoist rope (used to suspend the light fitting) from the hoist location back to the main lowering point directly above the light fitting.
Depending on the system we specify, there are two options:
Using a Contact Suspension Unit (CSU) or off the shelf self-contained lighting hoist – both these systems break the electrical feed to the light fitting when lowering to ground level (isolating the light fitting) and automatically make the electrical contacts when raised back up in the fully raised position.
Spring operated cable reel – there are some applications when it is necessary to have the light fitting energised throughout the raising and lowering process. When this is necessary, we would specify a spring-operated cable reel. The cable reel pays out the electrical flex to the light fitting as it is lowered to ground level and then automatically retracts the flex when raising the fitting back up to high level.
Secondary support - All our systems utilise a secondary support anchor when the light fitting is at the upper raised position. This comes in the form of either a ‘mechanical lock’ or a secondary support rope (able to support the full weight of the fitting). The mechanical locking device ensures the weight of the fitting is only acting on the hoist system components during the raising and lowering process.
Worm drive gearboxes - We use self-sustaining worm drive gearboxes on all our electric bespoke systems. This prevents the gearbox running back if the motor were to fail.
Electromagnetic brakes - The motors we use contain an electromagnetic brake which is always engaged when there is no power to the motor.
Torque limiters - All bespoke single rope hoist assemblies have a torque limiting device fitted as standard. This ensures that, should a winch rope snag or become entangled, the hoist will deactivate to prevent over torqueing the rope and putting it under unnecessary strain.
Slack rope switches - All bespoke single rope hoists have ‘slack rope limit switches’ fitted as standard. These constantly monitor the tension of the hoist rope and deactivate the hoist should they slacken off to prevent the hoist paying out rope. This ensures the hoist maintains even rope lays on the hoist drum.
Limit switches - We always use mechanical limit switches to ensure the ultimate range of travel can be set to avoid a light fitting impacting the floor or ceiling.
Winch inverter - The winch controller has ‘soft start’ functionality, ensuring there is a gradual, smooth acceleration up to full speed to avoid potentially dangerous ‘jolting’ of delicate light fittings.
A fully bespoke system would usually be ready to install approximately 4 weeks from deign approval. Our self-contained ‘off the shelf’ lifts can be ready to ship in less than a week.
Weight is the main criterion when selecting the appropriate system. The weight of the luminaire plus the weight of any accessories must be taken into account. Never exceed the lifting capacity of the system.
Lowering Distance is the second most important point to consider. What is the distance from the ceiling to ground level?
Shape and design. Is the luminaire directional? Or particularly long, with multiple hanging points? The shape and design of the luminaire determines whether single or multiple suspension wires are required.
Luminaire Requirements - Additional contacts for DALI/dimming circuits or similar would require a multi-contact system. In addition to the main lighting circuit, additional auxiliary contacts can be provided via a contact suspension unit, spring operated cable reel or self-contained multi-contact hoist.
Control and operation of the electric winch systems can be carried out via a plug-in hand held Remote Control Unit, wireless radio remote control or hard-wired buttons on a control panel.
Lead time – How quickly do you need your lighting lift? We have a range of ‘off the shelf’ self- contained electric lighting hoists that are easy to install and on short lead times.
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