3-4
Applying Power for the First Time
P/N 0013-1025-001 Rev F
VCS Gain (VCS)
The velocity command signal VCS is the main input signal for the velocity servo loop. It can be
scaled down by the VCS gain potentiometer, to provide for a proper balance between VCS signal
and the tachometer feedback signal.
VCS Signal and Scaling (VCS)
The MAX-430 drive can be more finely tuned by looking at the response to a step VCS input on
an oscilloscope. The equipment needed is a signal generator and an oscilloscope.
VCS Signal Input
Connect the output of the function generator to the VCS+ and VCS- inputs (P1 pins 1 and 2),
and connect the oscilloscope to the tachometer signal. Set the function generator for a frequency
of 0.5 Hz, with an amplitude of ±0.5 volts (square wave).
VCS Gain Setting
Turn the VCS gain potentiometer CW until a ±0.5 volt tachometer signal is observed on the
oscilloscope. Make adjustments as required to obtain optimum system response as shown in
the “System Response to a Step VCS Input” on page 3-5.
VCS Signal Scaling
After the desired system response is obtained by appropriate adjustment of the COMP Control
and/or the TACH gain, adjust the VCS gain for the desired scaling of VCS volts to motor RPM.
Both TACH and VCS potentiometers are used to provide the required overall speed scaling.
Содержание MAX-430
Страница 33: ...Applying Power for the First Time 3 5 Instruction Manual Intro FIGURE 3 1 System Response to a Step VCS Input ...
Страница 36: ...3 8 Applying Power for the First Time P N 0013 1025 001 Rev F ...
Страница 42: ...4 6 Diagnostics Troubleshooting P N 0013 1025 001 Rev F ...
Страница 50: ...6 6 Component Ordering Information P N 0013 1025 001 Rev F ...
Страница 52: ...7 2 Reference Drawings P N 0013 1025 001 Rev F Intro FIGURE 7 2 Simplified Circuit Diagram ...
Страница 54: ...A 2 Differences from the MAX 400 P N 0013 1025 001 Rev F ...
Страница 58: ...Help 4 Documentation Improvement Form P N 0013 1025 001 Rev F Second Fold Tape First Fold ...
