Accelnet Plus Micro Modules User Guide
16-01687 Rev 03
Copley Controls
Page 115 of 139
I
NPUT
C
OMMAND
T
YPES
The drive can be controlled by a variety of external sources: analog voltage or digital inputs,
CAN network (CANopen), EtherCAT, CoE (CANopen application protocol over EtherCAT), or
from an RS-232 serial connection using ASCII commands. The drive can also function as a
stand-alone motion controller running an internal CVM or CPL program or using its internal
function generator.
A
NALOG
C
OMMAND
I
NPUT
O
VERVIEW
The drive can be driven by an analog voltage signal through the analog command input which
has a range of ±10 Vdc. The drive converts the signal to a current, velocity, or position
command as appropriate for current, velocity, or position mode operation, respectively. The
analog input signal is conditioned by the scaling, dead band, and offset settings.
S
CALING
The magnitude of the command generated by an input signal is proportional to the input
signal voltage. Scaling controls the input-to-command ratio, allowing the use of an optimal
command range for any given input voltage signal range.
For example, in current mode, with default scaling, +10 Vdc of input generates a command
equal to the drive’s peak current output; 5 Vdc equals half of that
.
Scaling could also be useful if, for example, the signal source generates a signal range
between 0 and +10 Vdc, but the command range only re7.5 Vdc of input. In this
case, scaling allows the drive to equate 7.5 Vdc with the drive’s peak current (in current
mode) or maximum velocity (in velocity mode), increasing the resolution of control.
D
EAD
B
AND
To protect against unintended response to low-level line noise or interference, the drive can
be programmed with a “dead band” to condition the response to the input signal voltage. The
drive treats anything within the dead band ranges as zero, and subtracts the dead band value
from all other values. For instance, with a dead band of 100 mV, the drive ignores signals
between
–
100 mV and +100 mV, and treats 101 mV as 1 mV, 200 mV as 100 mV, and so on.
Input
O
u
tp
u
t
0
-100
-200
100
200
0
200
-200
-100
100
Dead Band
