Motion Without Limits
™ Having selected the right motor/gearbox combination, the user should then evaluate if any options are required for the geared motor:
The brake lining is spring loaded against the friction plate, so the brake coil must be energized to release. In the event of a power failure, the brake is applied, so the unit is fail safe. The brake fits under an extended fan cowling on the end of the motor. Dimensions are shown on page 9. The brake requires nominal 200-230V AC power (which is rectified for the DC coil). This means that the brake should not be connected in parallel with a motor phase if the unit is powered by a controller, as the voltage reduces at low speeds, and the brake could be applied while the motor was still driving. The correct method would use the programmable relay output from the speed controller to switch the brake coil supply, or to control via a PLC.
It is possible for the geared motor to generate up to 3 times the nominal force on startup and this may be sufficient to cause a problem with the customer’s application or in some cases (identified in italics in the relevant table on page 13) to damage the DLS transmission. In these cases, a Torque Limiter may be specified on the gearbox. The maximum torque is set by tightening a lock nut to the desired level. In the event of the torque or force generated exceeding the preset level, the friction clutch will slip. Dimensions are shown on page 9.
Motor Options
The standard 3 phase geared motor is protected to IP54 and is finished in dark blue epoxy paint. It is suitable for running at 200-230V 50/60Hz 3Ø with windings in delta ( $ ) connection and 380-460V 50/60Hz 3Ø in star (Y) connection (motors are supplied configured for Y connection). Motors with enhanced IP rating, special finishes and a range of alternative single and three phase windings can be supplied on request. Contact Bishop-Wisecarver for details.
Allen-Bradley Bulletin 160 Smart Speed Controller
This will allow the user to drive the AC geared motor and the DLS over a range of programmable speeds and accelerations. There are two types of units, which differ in the way that the desired speed is selected: The Analog Signal Follower version has the speed set by a control voltage (which can easily be generated with a potentiometer). The preset speed model has up to 8 operating speeds which are simply programmed in via the keypad provided. Versions are available to operate on single or 3 phase supplies (note that all types create 3 phase output to drive standard
3 phase motors).The Smart
Speed controllers are available in 4 power ratings to suit the range of
Ac geared motors: Motor SizesRequired Controller Power 80 L/21.5kW80 S/2 & 80 L/40.75kW80 S/4 & 71 L/20.55kW71 L/4, 71 S/2 & 71 S/4 all 56 & 63 frame motors0.37kW An external
Capacitor Module can be fitted for extended “ride-through” capabilities (reduces the risk of nuisance tripping on poor supplies) or improved inherent braking performance (note that this will improve the braking of the drive but is of no comparison to what is available with the dynamic
braking unit). This unit is supplied as standard with the 1.5kW 1 phase 230V unit.To ensure that the unit does not emit or react to excessive electromagnetic interference and to ensure compliance with EU EMC directive, units are supplied with a separate
Bulletin 160 shown DIN rail mounted with capacitor module
Optional Dynamic Braking ModuleLine Filter is supplied as standard with all Speed Controllers line filter . This unit is designed such that the controller can be attached directly on top of it, with tapped holes provided.If the system is required to act as a dynamic brake (e.g. if the unit is lowering or decelerating a heavy load) it will be necessary to specify the dynamic braking module .
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