|
Four
quadrant control of DC Motors
Model 2761 Signal Isolation Amplifier
Model 2761CT Current Sensing Isolation Amplifier
|
|
Dual AC input power voltage selection, 115/230 VAC, 50/60 Hz
1500 VDC Isolation
Excellent linearity: 0.1% typical
Accepts voltage or current signals
Optional current sensing feature
Customer selectable jumpers
Five input voltage ranges: 200mV, 1V, 5V, 10V, 100V
Three input current ranges: 1~5mA, 4~20mA, 10~50mA
Four optional current sensing ranges: 10A, 20A, 50A, 100A
Two on-board trimpots: offset, range
Manual external pot set-up capability
DIN-RAIL mounted enclosure
Accepts floating or grounded signal inputs
Temperature operating range: 0~70°C
|
|
DESCRIPTION: |
|
The MODEL 2761
Signal Isolation Amplifier provides complete electrical isolation
between signal input voltages or currents derived from programmable
controllers, process transducers such as light, pressure, and temperature.
The amplifier can also accept an analog signal from a digital-to-analog
converter. The output of the Isolation Amplifier is connected to the
input of any variable speed motor control with an analog input capability.
The maximum output voltage of the Isolation Amplifier is ±10
VDC, which is a linear function to the input signal.
The Model
2761 Signal Isolation Amplifier can accommodate a wide range of input
voltages (±200mV, ±1V, ±5V, ±10V, ±100V)
and, in addition, a wide range of input current signals (1~5mA, 4~20mA,
10~50mA).
The Isolation
Amplifier can be set-up as a manual master control by wiring a 10K
ohm master potentiometer as follows: CW terminal to reference output
terminal, wiper terminal to signal input, CCW terminal to input common.
This Isolation
Amplifier can be used as an armature voltage follower. Setting the
amplifier up in this configuration will allow you to control one motor
speed in proportion to that of an independent DC motor. The signal
input would be derived from the voltage across the armature of the
master motor, since speed is proportional to the voltage. The amplifier
should be set-up for the ± 100 VDC setting for 90 VDC rated
motors. If more than one slave motor speed controller is to follow
the output from a single master amplifier, setting the ratio between
two or more of the motor speeds can be accomplished with ratioing
pots.
Board mounted
trimpots provide the scaling ability required to match a given range
of input signal with the desired range of output voltage. the range
adjustment trimpot sets the amplifier output when the maximum signal
input is applied. The offset trimpot provides nulling the output voltage
when signal input applied is calling for 0 VDC output.
The MODEL
2761 CT Isolation Amplifier has an optional current sensing feature
with the following ranges: 10A, 20A, 50A, 100A. The amplifier provides
the precision, stability, and isolation needed to accurately monitor
motor current in high noise motor control environments. The amplifier
can also be used for general purpose industrial current sensing that
requires isolation. The maximum output voltage is ±10 VDC,
which is a linear function of the current.
|
|
|
|