IM483H/IM805H Rev. R032206
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IM483H/IM805H Rev. R032206
S e t t i n g t h e O u t p u t C u r r e n t
The INT-483H/805H uses the IM483H or IM805H’s internal current source
to adjust the output current of the driver. In order to calculate the run and hold
currents for the driver being used, please refer to
Section 7: Interfacing to the
IM483H/IM805H
of this document. The figure below illustrates the resistor
connections for both run and hold currents.
J u m p e r S e t t i n g s
JP2:1-2:
If the shunt is placed on the “ENON” side of the jumper (between pins 1 & 2)
the drive outputs will be disabled approximately .5 seconds after the last step clock input.
Note that in this mode of operation the current reduction resistor MUST NOT be used or
the drive will operate erratically. This mode should only be used if no holding current is
required.
JP2:2-3:
If the shunt is placed on the “ENOFF” side of the jumper (between pins 2 & 3)
the drive outputs will not disable following the last step clock pulse. In this case a cur-
rent reduction resistor can be used to set the holding current to some value. The jumper is
illustrated in figure A.5.
NOTE: When connecting both the current adjust and the
current reduction resistors, connections should be made
as short as possible to minimize the amount of electrical
noise coupled into the driver.
WARNING! When using the “ENON” mode of disabling
the outputs following a move the current reduction resistor
MUST NOT be used or the drive will operate erratically.
Figure A.4: INT-483 / 805 Current Adjustment Resistors
JP
2
JP
1
EN
O
N
/
EN
O
FF
O
P
TO
/
+5
V
MS0
MS1
MS2
MS3
SW1
TH
IS
S
ID
E “
O
N
”
PO
WER
FAU
LT
FAN
P3
+5V
2
1
P1
P2
Pin 1
Pin 1
Current
Adjustment
Resistor
Current
Reduction
Resistor