SMD17E2 SPECIFICATIONS
SMD17E2 User Manual
ADVANCED MICRO CONTROLS INC.
16
Indexer Functionality (continued)
Stall Detection with SMD17E2 Units
Stall Detection is one of the additional features available to you when you order an encoder option on an
SMD17E2. When Stall Detection is enabled, the SMD17E2 monitors the encoder for position changes,
regardless of whether or not a move is in progress. If the error between the encoder position and the motor
position exceeds forty-five degrees, the SMD17E2 responds in the following manner:
The stall is reported in the network input data.
The motor position becomes invalid. (The machine must be homed or the motor position preset before
Absolute moves can be run again.
If a move was in progress, the move is stopped.
Note that a move does not have to be in progress for stall detection to be useful. As described later in this
chapter, there is an auxiliary power pin that powers the electronics of an SMD17E2 but does not power the
motor. The primary use of this feature is to keep the unit on the network while power is removed from the
motor. When using the DCPower
AUX
pin, the SMD17E2 cannot sense when power has been removed from
the DCPower
MAIN
pin. By enabling stall detection, the SMD17E2 can notify the system if the motor shaft
moves more than forty-five degrees while power is removed from the motor.
Driver Functionality
This table summarizes the features of the stepper motor driver portion of an SMD17E2.
Table R1.2 Driver Functionality
Feature Benefits
RMS Current Control
RMS current control give an SMD17E2 the ability to drive the motor at its
fully rated power regardless of the programmed steps per turn. There is no
reduction in power when microstepping that may occur with other drivers.
Programmable
Motor Current
RMS current supplied to the motor can be programmed from 0.1 to 2.0
amps in 0.1 amp increments. Reducing the motor current to the minimum
needed for your application will significantly reduce the motors operating
temperature
Programmable Idle
Current Reduction
Extends motor life by reducing the motor current when motion is not
occurring. This extends the life of the motor by reducing its operating
temperature.
Programmable
Motor Steps/Turn
Allows you to scale your motor count to a real world value. (counts per
inch, counts per degree, etc.)
Anti-Resonance Circuitry
This feedback circuitry and algorithm gives the SMD17E2 the ability to
modify motor current waveforms to compensate for mechanical resonance
in your system. This will give you smooth performance over the entire
speed range of the motor.
Over Temperature
Detection
An SMD17E2 sets a warning bit in the network data when the temperature
of the unit approaches its safe operating threshold.
Over Temperature
Protection
Protects your SMD17E2 from damage by removing power from the motor
if the internal temperature of the driver exceeds the safe operating thresh
-
old of 203°F/95°C.
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