28
BLuAC5 S/Q Hardware manual
920-0049 Rev. C
12/8/2014
Analog Inputs
The BLuAC5 has two ±10 Volt analog inputs that can be used individually as single ended
inputs or differentially as one input. Analog inputs are used by the servo drive for a number of
dedicated purposes for controlling the servo or they can be used as general purpose analog
signals.
Three dedicated purposes:
•
Analog Torque Mode
•
Analog Velocity Mode
•
Analog Positioning Mode.
Each of these three modes uses the analog input(s) for “commanding” the servo drive.
An analog signal can be also used to stop a “Feed to Sensor” move or to trigger a “Wait on In-
put”. The analog inputs can be read as variables in the SCL and Q languages and then used
to set nearly any drive parameter.
Basic Specifications:
•
Each input can accept ±10 volts.
•
The inputs have an impedance of 20K ohms.
•
Because of the nature of the design, will
exhibit a 1.4V offset when not driven by an
analog source.
•
Low source impedance is important for mini-
mizing analog errors, 100 ohms or lower is
recommended.
WARNING - Analog inputs must be used with care, they are not optically isolated and may not oper-
ate properly or could be damaged when system grounds are not compatible.
IN/OUT 1
GND
20k ohms
A_CH1
A_CH2
+5
AIN+
AIN-
20k ohms
18
1
2
19
+10V to -10V
signal
signal return
IN/OUT 1
GND
AIN+
Single Ended Input
1
19
IN/OUT 1
GND/Shield
GND
±10V
AIN+
Differential Input
±10V
AIN-
1
2
19
