28
The value of the capacitor should be approximately 150
µ
F for every Amp
of peak per phase output current and should be placed as close to pins 7
and 8 as possible. See figure 1.5.1 for connection drawing.
See the section titled for the model IB drive you purchased in Part II of
this document for power supply specifications and recommendations.
I n t e r f a c i n g t h e L o g i c I n p u t s
The IB series drives have 4 isolated logic inputs: Enable, Step Clock,
Direction, and Half/Full Step. These inputs are optically isolated and have
a maximum forward input current of 15mA. Precise specifications on
these inputs can be found in Part II of this manual, in the section
pertaining to the model IB drive you purchased. These inputs
require
a
current limiting resistor or use of one of the interfaces diagrammed in this
section. Failure to utilize a resistor or recommended interface will damage
the input circuitry of the drive and render it inoperable.
The following diagrams illustrate the recommended circuits for interfacing
the logic inputs.
WARNING!
A current limiting resistor or use of a
recommended interface is required in series with the logic
inputs! Use of these inputs without this resistor or
recommended interface will result in damage to the drive!
Figure 1.5.2: Opto-coupler Input Circuit
ENABLE
CW/CCW
LOGIC GROUND
I
F
I
F
V
F
V
F
EXTERNAL
RESISTOR
EXTERNAL
RESISTOR
1
5
2
