Electric traction control
The traction electric drive control circuit has no differences from the lifting circuit, so it is not given here. The four-engine electric drive of the ESH-1590A excavator is controlled according to the scheme similar to the lifting scheme, but its fundamental feature is the presence of a reversal mitigation unit. The purpose of the reversal mitigation node was explained above, at.
However, this node is structurally constructed in this scheme is made in a slightly different way than in the scheme. Here, the PMUV-3 winding in all modes, except for braking with reverse, provides weak negative feedback on the voltage of the generator, containing due to the presence of a 2KKV capacitor, a component of a flexible negative connection in voltage.
In these modes, the resistance circuit of 6 pushes is open, since the RPVV (RPNV) valve 5VGV (6VGV) is included in the circuit of the closed reversal contact of the RPVV, which excludes the flow of current with this polarity of the generator. When braking with a reverse, the polarity of the generator voltage is preserved the same, and reversible contacts are switched and the resistance of 6 pushes is connected to point A of the potentiometer of the ZSUV.
Considering the circuit of the voltage feedback unit for the reversal braking mode, it can be concluded that the PMUV-3 winding is included in the diagonal of the bridge formed by the resistances of the GAB, GB, 6 SSUs and SDVZ. The selection of resistance 6sules can be changed within a wide range of voltage feedback. So, if you choose it from the condition of the protection circuit of the protection units at the ESH-1590A excavator are similar to the same nodes at the ASh-1590 excavator.
Schemes with magnetic cutting off the current excavator ECG-8 generators of the lifting of GP, the pressure of GN and rotation of the ECG-8 excavator GVC have independent excitement from the power three-phase magnetic amplifiers of the municipal unitary enterprise, mong and muvs having a bridge of the load on the load. The rotation generator is used to power the engine engine when moving.
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