Danaher Motion
Operation Information
30 SERVOSTAR
®
SBD-Series ST/CT Product Family
Remote Enable Input (C2 Pin 10)
The Remote Enable input provides a hardware drive enable switch. This input disables or enables the
power stage output to the motor. The signal must be tied to common (C2 pin 7) to enable the power to the
motor. The toggling of this input (Open-to common) will also initiate an attempt to recover from a fault
condition.
External Current Limit (C2 pin 11)
This input can be left open to obtain full torque to the motor. Taken to common, this input will reduce the
amount of current to the motor by a percentage determined by the compensation component #27. See
current clamp description for values.
Torque Hold Input (C2 pin 12)
This input can be tied to common (C2 pin 7) to cage the velocity loop amplifier. This prevents the drive
from creating any significant current command to the motor.
Analog Input (C2 pins 13 and 14)
The drive receives its command from an analog voltage source connected to these terminals. The voltage
range of this input is from –10 volts to +10 volts. The analog input to the SERVO
STAR
is differential;
meaning that the signals received at the two inputs are subtracted from each other to create a difference
used to command the rest of the system. This type of input has a high degree of noise immunity and, in
many cases, allows for ground isolation between systems.
The input voltage from the differential receiver is applied to a gain-adjust potentiometer (called Scale)
located on the compensation card to allow you to adjust the volts/RPM scaling of the drive. The
SERVO
STAR
adds an analog offset to allow for drift-control through the adjustment of the trimmer
potentiometer located at the top of the drive unit. Under normal system phasing, a positive voltage on
these terminals commands the motor in a clockwise direction.
The analog signal wires should be a twisted, shielded-pair cable run free from any noise signals such as
relay and solenoid wires as well as the motor armature and power line wires. While a shield pin (C2 pin
15) is provided, it is usually best to tie the shield of this cable at the source-end. If it is impractical to tie
this cable at the source end, it is best to tie this cable directly to the drive case.
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