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Cranes: Speed Monitor
Crane Control
Crane Personnel Protection System

Introduction

This device is primarily intended for monitoring excess speed in both slow and fast operation, and is self monitoring in order to prove the system remains functional in service.

By virtue of its design, the device incorporates an anti-plugbraking feature, in addition to accommodating the 'fast speed enable' function, which proves motor rotation in addition to the preset 'slow-to-fast' time delay.

In the event of a fault detection, monitoring relays would all de-energise, providing dual channel shutdown of the hoist motion contactors. These relays are monitored in their de-energised state on energisation of the main contactor, thereby ensuring their correct operation.

Furthermore, a monitoring relay would de-energise, which would trip out the main contactor.

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