Backdrop and light hoist
The overloading of theatre backdrop and light hoists should be prevented.
When the light hoist is loaded with too much weight (too many spotlights, etc.), the current monitoring relay E3IM10AL20 detects that the permissible load has been exceeded with the overcurrent function based on the quantity of electricity required by the motor and cuts the power to the motor protection contactor to prevent the hoist from rising further. A control switchover only allows the hoist to be lowered. When the excess load is removed, the hoist can be used again.
– Protection against overloading the cable hoists, thereby protecting the people on the stage
– Motor protection / personnel protection
– Reduction of wear and service costs