Siemens 4000i Manuel de service télécharger pdf (Page 209)

IR COMPENSATION (IR COMP)

The IR COMP trimpot setting determines the degree to which

motor speed is held constant as the motor load changes. It is

factory set for optimum motor regulation.

Use the following procedure to recalibrate the IR COMP setting:

1. Set the IR COMP trimpot to minimum (full CCW).

2. Rotate the speed adjust potentiometer until the motor runs at

midspeed without load (for example, 900 RPM for an 1800 RPM

motor). A hand held tachometer may be used to measure

motor speed.

3. Load the motor armature to its full load armature current rating.

The motor should slow down.

4. While keeping the load on the motor, rotate the IR COMP

trimpot until the motor runs at the speed measured in step 2. If

the motor oscillates (overcompensation), the IR COMP trimpot

may be set too high (CW). Turn the IR COMP trimpot CCW to

stabilize the motor.

5. Unload the motor.

See Figure 18, for recommended IR COMP settings.

Calibration

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Siemens 4000i Manuel de service Page 209