Nidec MCE iControl - Manually Adjusting Motor Field Gains

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2-32 Manual # 42-02-7223 C1

Manually Adjusting Motor Field Gains — Closed Loop (SCR)

Note

These manual adjustments are almost never necessary. They are useful only in instances of

extremely poor motor field response.

If, after calibration and settings checks are complete, there are still performance issues, e.g. the

drive Current Limit LED lights at the beginning and/or end of runs or you feel spotting (hesita-

tion) coming into a floor, the hoist motor response to control inputs may not be rapid enough.

In these instances you may be able to manually adjust motor field gains to compensate.

1. On the Configuration > Motor Field > Control tab, set PID/Field proportional to 1.0 and

PID Field integral to 3.0.

If satisfactory performance is not achieved with the above settings:

2. Select Virtual Oscilloscope from the View menu.

3. Set Test point 1 to Field Integral Gain.

4. Monitor iBox test point STP 1 with an oscilloscope.

5. Observe response while changing Voltage/Field standing voltage from the standing

voltage value to the forcing voltage value and back again.

If oscillation or overshoot is observed:

6. Decrease PID/Field proportional by 0.2 and repeat step 4.

7. If reducing PID/Field proportional had no effect, reduce PID/Field integral by 0.2 and

repeat step 4. UNDER NO CIRCUMSTANCES should Field proportional or Field inte-

gral be below 0.25.

If no oscillation or overshoot is observed:

8. Increase PID/Field proportional by 0.5 and repeat step 4. If there is still no oscillation

or overshoot, continue increasing Field proportional by 0.5 increments and repeating

step 4 until you see oscillation or overshoot. When you see oscillation or overshoot,

reduce Field proportional to 50% of its value (not below 0.25).

9. Next, increase PID/Field integral in 0.5 increments while repeating step 4 until oscilla-

tion or overshoot is observed. (DO NOT set Field integral above 10.0.) When oscillation

or overshoot is visible, reduce Field integral by 10%.

The preceding two steps are designed to achieve the desired response using the lowest Field

proportional and integral values possible.

Nidec MCE iControl - Manually Adjusting Motor Field Gains - Closed Loop (SCR)