Download Rand servo setup top 25

Servo Setup RANDTRONICS
B / Bx, KM3 & 3P MAX 1, 2, 32
Problem description:
Servo out of adjustment.
Circles out of round @ 45 degree points.
Axis overshoot, rough jerky travel.
Axis motor “growling”.
Please read the following information before continuing:
General Safety and Maintenance Procedures
The Servo amplifier employs voltages, which are sufficient to cause personal injury or
damage to the equipment. Caution should always be exercised when working on the Servo
system and the following rules should always be observed.
1.
Both the 120 VAC power source and the high power DC bus voltage should be
removed before performing any maintenance work on the Servo amplifiers or the
Servo motors.
2.
Allow the voltage on the power bus capacitor(s) to bleed off before working on
the Servo amplifier(s). Do not discharge by shorting capacitor terminals together.
3.
Do not make any adjustments to the Servo amplifier(s) unless you are thoroughly
familiar with the
equipment.
4.
Always wear a grounded wrist strap when removing the axis drive assembly from
the chassis or when handling the drive assembly. Use anti-static bags to store
or transport the axis drive assembly.
5.
Occasionally inspect the heat sinks and circuit boards for accumulated dust and
dirt. The heat sinks should be kept clean for maximum efficiency. If cleaning is
required, remove the axis drive assembly and carefully blow it off with dry
compressed air. If the board will not come clean try using alcohol but be sure the
board has time to dry before use.
PROPRIETARY INFORMATION
INFORMATION CONTAINED HEREIN IS THE PROPERTY OF HURCO MANUFACTURING COMPANY,
INC. NO REPRODUCTION OR DISCLOSURE OF THIS INFORMATION SHALL BE MADE BY THE
RECIPIENT TO ANY OTHER PERSON OR ORGANIZATION WITHOUT THE PRIOR WRITTEN
CONSENT OF HURCO MANUFACTURING COMPANY, INC.
Servomate (RANDTRONICS) Amplifier set-up Procedures
Control
Model
B
BX
KM3 BX
SM1 BX
KM3
MD1
MD3
X&Y
MD3 Z
axis
BMC 10
BMC 15
(SEE NOTE)
Pots
Pot Presets
Signal
20ccw
5cw
20ccw
5cw
20cw
20cw
20cw
8ccw
20cw
20cw
20cw
Aux
20ccw
20ccw
20ccw
20ccw
20ccw
20ccw
20ccw
20ccw
Tach
20cw
8.5ccw*
20cw
20cw
20cw
8ccw
20cw
4ccw
20cw
20cw
20cw
Balance
(See
Example)
20cw
9ccw
20cw
9ccw
20cw
9ccw
20cw
9ccw
20cw
9ccw
20cw
9ccw
20cw
9ccw
20cw
9ccw
Gain
20cw
5ccw
20cw
5ccw
20cw
6ccw
20cw
9ccw
20cw
5ccw
20cw
5ccw
20cw
9ccw
20cw
9ccw
CLM
Gain
20cw
20cw
20cw
20cw
20cw
20cw
20cw
20cw
Adjustments
Adjust Gain pot CW until the axis goes into oscillation. Then turn the pot CCW until the
oscillation stops, then turn an addition ## of turns. (See below).
Gain##
5
5
5
3 to 5
3 to 5
3 to 5
3 to 5
3 to 5
Adjust
Sig to get
.9 VDC @
25 ipm
Sig to
get .65
VDC @
25 ipm
Tach to
get .65
VDC @ 25
ipm
Tach to
get .8
VDC @ 40
ipm
Tach to
get .8
VDC @
40 ipm
Sig to
get .8
VDC @
40 ipm
Tach to
get .8
VDC @
40 ipm
Sig &
Tach to
get .8
VDC @ 40
ipm (SEE
NOTE)
Notes
*
**
KM3 BX and SM1 BX machines have “all black style” electrocraft axis drive motors.
Adjust Sig first if more than 3 turns, Adjust the tach , They interact!
Example adjustment on B control style machine.
First preset the Sig pot 20 turns ccw then back 5 turns cw. Then preset the Aux pot
20 turns ccw, next the Tach 20 turns cw then set the Balance to 8.5 turns, next turn the Gain
20 turns cw then 5 turns ccw, Lastly turn the Clm 20 turns cw. With the servos on, adjust the
Gain until the axis being adjusted breaks into oscillation (on some machine this can be heard
on others you must look at the voltage going to the motor). Turn the Gain pot back until the
oscillation stops, then turn it additional 5 turns. Next fine tune the Balance by adjusting the
balance pot (BAL.) for the minimum stable DAC voltage and direction change gives equal
readings. Lastly with the axis traveling at 25 IPM measure the DAC signal and adjust the
Sig. Pot so DAC reads .90 VDC. Calibrate the machine and check display values, if not
0.0000” then adjust Bal. slightly and re-cal until display is 0.0000”. DAC command voltage
can be measured between pins #8 & #9 on servo control bd connector for the axis under
adjustment.