300 SERIES USER GUIDE
20
They are listed here for information only.
The type of signal (output, input, passive) is relative to the MB4 card, i.e. pin A is the
Ref+ signal that is an output from the card to the amplifier.
Pin Type Description
A O +Ref
B O -Ref
C P Signal Ground
D P Ref Amp Output
E O Aux. Input
F I +11V Output from Amplifier
G P Logic Ground
H I -11V Output from Amplifier
I N.C.
J O /Reset
K I Preamp Output (To Curr-Lim & Feedback Gain trimpots)
L O Wiper from Preamp-Out trimpot (Feedback Gain)
M O Tachometer Input
N P Summing Junction of Servo Preamp in 30X amplifier
O O /Enable
P O /Pos Enable
Q O /Neg Enable
R I +14V Output from Amplifier
S I Normal Signal from Amplifier
T I +5V
VREF
Output from Amplifier
U N.C.
V I Current Monitor Output
Table 14
MB4 Card Options
The various options available with the MB4 card are described below.
Voltage-Mode (-V option)
Voltage mode changes the amplifier from a voltage-in, current-out operating mode to
voltage-in, voltage-out. (See p. 26 for further information)
IR-Comp (included with -V option)
This can be enabled with jumpers when operating in the voltage mode. IR comp will
increase the amplifier output voltage as the load current increases. When properly
adjusted, it will compensate for the loss of armature voltage that occurs because of the
resistance of the motor-armature, and can provide constant velocity operation without
using a tachometer. (See p. 27 for further information)
PWM Inputs (-D option)
Digital inputs are converted to ±Ref voltages with this option. Useful with
microprocessor controllers, this mode takes a 0-100% PWM and a direction signal as
inputs, or a single PWM signal that outputs a 50% duty cycle as the 0 level, and changes
from 0-100% to emulate full-scale ±Ref voltages. (See p. 29 for further information)
Edge filters (-F option)
An L-R-C filter network that will slow down the rise and fall times (the 'edges') of the
output waveform. This reduces the electrical noise that can couple from motor cables
into surrounding electrical equipment. Another purpose for this option is to supply the
minimum inductance that the amplifier needs to operate printed-circuit, or other low
inductance motors without having to use an external inductor.
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