Reducing/Disabling The Output Current; Figure 7.4: Reducing The Output Current - Intelligent Motion Systems Excellence in Motion IM805H Operating Instructions Manual

R e d u c i n g / D i s a b l i n g t h e O u t p u t C u r r e n t
The IM483H/IM805H will automatically reduce the current in the motor
windings after a move provided the onboard 1mA current source, along with
a current adjustment resistor, is used to set the output current and a resistor is
placed between pins 2 and 3 of connector P1. Using this will greatly reduce the
amount of motor and drive heating in your system.
The amount of current reduced will depend upon the value of the Reduction
Adjust Resistor (R
Current will be reduced 0.5 seconds after the rising edge of the last Step Clock
Pulse. The value of R
I
Run
= 500 x
R
Red
(
I
Run
I
Run
= 150 x
R
Red
(
I
Run
CURRENT REFERENCE
CURRENT ADJUST
CURRENT REDUCTION
Figure 7.4: Current Reduction Adjustment Resistor Connection
) and the value of the current adjust resistor (R
Red
is calculated as follows:
Red
I M 4 8 3 H
x I
Hold
)
- I
Hold
IM 805H
x I
Hold
)
- I
Hold
Pin 1
CURRENT ADJUST
RESISTOR
CURRENT
REDUCTION
ADJUST
RESISTOR
P1
Bottom View
I is the desired peak running
Run
current. Range 0.4A to 4A Peak
I is the desired peak holding
Hold
current. Range 0.2A to 4A Peak
I is the desired peak running
Run
current. Range 1.0A to 7A Peak
I is the desired holding cur-
Hold
rent. Range 0.5A to 7A Peak
P2
POWER GROUND
Pin 1
IM483H/IM805H Rev. R032206
) . The
Adj
43