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Operation of the OGB-3 limiter (as well as other analog limiters: OGK, ONK-M, OGB-2) is founded on the principle of comparison of sensor signal of effort - DUS measuring arrow weight with the lifted load, with departure sensor signal - DV (arrow tilt angle) setting the characteristic of loading capacity of the crane. These signals are given in the limiter control unit on the electronic comparing device which depending on signals manages the executive relay and lamps - green It "is authorized", red - It "is forbidden" on the panel of the alarm system of the limiter which is in the crane operator's cabin. Also on the panel of the alarm system there are pointer instruments specifying: "Mopr" - the moment of capsizing of the crane as a percentage and "Lm" - arrow length in meters. Contacts of the executive OGB-3 relay are included in guidance system so that at achievement of ultimate load the dangerous movements of the crane are prohibited.
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Mopr – the moment of capsizing of the crane as a percentage
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