A reliable indicator which may be rapidly attached to any lift to give an indication of the loading condition and/or provide a trip signal to the lift control circuit.
A range of models are manufactured to suit most requirements and special units can be made to order. 

Installation is very easy and requires no 
dismantling of the lift assembly. 
The solid state electronics unit is contained 
in a robust, sealed metal case with external 
indicating lights showing the operating condition. 

The unit is essentially maintenance-free but 
should either the sensor or the indicator be 
damaged all units are interchangeable and 
do not require any matching.

The advantages of using the Lift Overload Indicator are:

For the lift owner

The electrical and mechanical components of the installation are not overloaded and are working within their design criteria. The brakes in particular are not having to do excessive work and hence will not require frequent attention. Maintenance costs are therefore kept to a minimum.

For the lift user 

Lift breakdowns resulting from overloaded operation will be avoided. The lift will remain in continual safe operating condition. The only downtime experienced will be the usual routine maintenance.

For the lift engineer and his company

Urgent callouts to lifts out of action due to misuse by overloading are avoided. 
The company can work to a planned program of maintenance and parts replacement.

For the lift design engineer 

By designing in overload protection the manufacturer will enhance his reputation by offering his customer a better, safer and more durable installation.

The  Overload Indicator can be easily fitted to existing installations with a minimum of downtime.

TYPE 5860A

A unit having one set point for overload cut-off or warning. It may be used in conjunction with a counter for monitoring the number of overload or near-overload operations.

The Overload Indicator consists of 2 assemblies:

• 1. A small strain gauged beam which is bolted by 2, 6mm bolts to the Cross Head of the lift.

• 2. An electronic unit which looks at the output of the strain gauged beam and amplifies the signal and then compares it with an adjustable preset voltage. This voltage control sets the point at which the unit will trip and when used on a lift may be adjusted between the equivalent of 1 and 50 people.

In order to prevent rapid fluctuations of the electronic signal with a hesitant passenger, a built-in time delay requires that the signal should be applied for a period of 1/2 second before a response is produced.

In addition, to prevent hunting of the unit at the critical weight a built-in hysteresis control enables the limits of the dead zone to be set as required, usually about 0.4 of a person is adequate.

The whole unit is powered by a built-in stabilized power supply operating at a low voltage and only requires connection to the normal A.C. mains.

Indicator lights are provided on the outside of the instrument showing that mains power is applied and also giving an indication of the overload condition.

Three relay contacts are provided giving a common, normally open and normally closed connection, it is therefore possible to operate a warning sign in the lift car and a buzzer or chime and also to signal the lift control apparatus to prevent operation of the lift whilst in an overload condition

Three controls are available on the instrument panel:

• 1. Zero. “COARSE” and “FINE” zero controls compensate for any slight strain in the load cell after it has been bolted down to the lift.

• 2. Relay Trip Point. This control is adjustable to operate the relay at the appropriate load. It will be noted that a small built-in time delay prevents rapid operation of the relay (as could occur if a person jumped up and down in the lift).

• 3. Dead Zone. This a control which operates from zero to approximately 5% of full load and it prevents the indicator from hunting at the critical weight. 
  Generally, it should be set at about the half-way position.

The photograph shows a typical Overload Indicator Installation. The single sensor Type 5861A is shown bolted to the crosshead of the lift whilst the 5860A Indicator Unit is mounted close by. 
Typical take-off arrangements are shown on page five with suggested sensor positions.

TYPE 5860B

A 2 set point indicator generally as type 5806A but having an additional output relay operated by a separate trip point control. The intermediate trip point control having a fixed dead zone. 
This unit is designed to provide a warning signal at a percentage full load and a trip signal at full load.

TYPE 5860C

A unit similar to 5860B but having 5 set points consisting of one overload trip point with variable dead zone and 4 intermediate set points with fixed dead zone. Each of the trip points control an isolated volt-less set of changeover relay contacts.

TYPE 5860D

As type 5860C but with one set point with variable dead zone control and nine intermediate set points with fixed dead zone.

TYPE 5861 AC COMPENSATOR

The compensating unit is designed to operate with any of the Tinsley Lift Overload Indicators. The unit compensates for the weight of chain under the car at any position in the shaft.

The compensator consists of a special sensor with a long lead which is fitted under the car in such a way as to sense the weight of the chain. The signal from the sensor is fed into an electronic compensating unit which is mounted on the top of the lift adjacent to and connected to the lift Overload Unit. As shown in diagram below

Hydraulic Lifts

The Type 5860 Overload Unit can be used for hydraulic lifts by using the 5861B double sensor. Each unit of the sensor is mounted underneath the cable terminating brackets, one on each side of the lift.

The sensor is connected to the overload unit which can be mounted at the base of the lift shaft in any convenient position and connected electrically with the control room.

This system is very effective and reliable where the brackets are accessible and have a suitable area of the bracket free for the fitting of the sensor units.

However, today many brackets are fitted with compensators and safety devices which make it impossible to fit the 5861B sensor units.

TINSLEY have therefore developed a new sensor 5861H which is fitted in the hydraulic line of the lift system.

This system monitors the change in pressure of the hydraulic line as the load in the car changes.

The sensor can be fitted into the pipe line or into a suitable junction point.

The new sensor is shown in the adjacent illustration.

We will be pleased to give advice on the most suitable type of sensor for particular installations on receipt of sketches & details of the lift layout.

The sensor is a interchangeable with the standard sensors and is connected to the overload unit in the normal way. The standard setting up instructions can then be followed.

TYPE 5861E

An illuminated indicator and buzzer unit for giving 
visible and audible warning of the overload condition. Lights up in red ‘Lift Overload” and buzzes to draw attention to the condition but is not unpleasant in volume.