ABB NWX511a-2/R HESG112548R12 Differential expansion module

The adjustment a.c. amplification of the current regulators is done with the resistors R25 (standard 4.7kOhm) and R26 (standard 4.7kOhm) (see Figure 16), where each resistor is part of a voltage divider. Smaller resistor values increase the amplification. A response is seldom necessary here. Should, however, motors with higher winding resistors are used, the motor heats up already in idle operation, as the resistor of the winding, together with the inductance of the winding leads to high reactive current.

Remedy is possible by increasing the amplification. 

During the test stage, the fixed resistors can be replaced by potentiometers (25kOhm) and in series production the values determined can be realized by fixed resistors. Both resistors must have the same size. The accuracy must be 1% or higher. For adjustment, increase the current amplification with low speed until an "oscillation” becomes noticeable (a stronger motor noise starts with approx. 1kHz). Immediately reset the amplification until the oscillation stops and a tick more.

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