Intelligent Motion Systems IB Series Operating Instructions Manual page 66

R e d u c i n g t h e O u t p u t C u r r e n t
In order to use the current reduction feature on the OPT140 there are two
resistors that must be placed on the OPT140 board, R5 and R1. R5
should be a ½ watt resistor for the IB104, 106 and 1010. For the IB462
and IB463 a ¼ watt resistor should be used. The value of the resistor is
calculated using the following equation:
The value of R1, the reduction adjust resistor (R
using the current adjustment resistor tables in the section of the Hardware
Reference part of this document pertaining to the model IB drive you
purchased. It is calculated as follows:
The current reduction input on Pin 8 is pulled-up to +5VDC via a 1kΩ
resistor. When toggled LOW the current reduction adjust resistor R1 will
be switched in parallel with the current adjust resistor R4, thus the output
current of the driver will be set to the value specified by the total resistance
(R ) of R1 and R4 (see figure A.2: OPT140 Schematic Representation).
HOLD
The value of R
HOLD
holding current from the current adjust resistor table in the section
appropriate for the model IB drive purchased. This value will only be used
to calculate the value of R1 (R
64
R5 = 200 x (+V - 10)
will be the resistor value representative of the desired
) using the equation above.
RED
NOTE: If a resistor is not placed in the R4 position,
the run current of the driver will be at its full scale.
In this case the value of R1 would then equal the
value of the current adjust resistor specified for
the desired holding current from the current adjust
table being used.
) is determined by
RED