Figure 1.5.7 Switching Phase Currents; Figure 1.5.8 Isolated Switching Of Phase Currents - Intelligent Motion Systems IB Series Operating Instructions Manual

It is possible to switch the current adjust resistor value using the circuit
examples provided in this section. These circuits may be used to switch
from one output current setting to another, or to reduce the current in the
motor windings when the motor is in a locked position. Use of this will
reduce motor and drive heating considerably.
See Hardware Reference
part for R (current
adj
adjust resistor) values.
R 1 R
ADJ ADJ
Q1
Q1 - Q2: VNO300L OR EQUIV.
+5 VGS WILL TURN ON FETS
Figure 1.5.7: Switching Phase Currents
+V
R =
0.2 x I
F
MIN I = 10mA
F
I
F
4N25/4N26
Figure 1.5.8: Isolated Switching of Phase Currents
PIN 1
ENABLE
LOGIC
GROUND
H /F
STEP
CLOCK
CW /CCW
CURRENT
ADJUST
2
Q2
See Hardware Reference
part for R (current
adj
adjust resistor) values.
R
100kΩ R
ADJ
+10V
Q1 (VNO300L OR EQUIV.)
B Y J A D R A W N
PHASE A
PHASE A
PHASE B
PHASE B
V+
GROUND
D R A W N B Y J A
PIN 1
ENABLE PHASE A
LOGIC
PHASE A
GROUND
H /F PHASE B
STEP
PHASE B
CLOCK
CW /CCW V+
CURRENT
GROUND
ADJUST
31