Danaher Motion
System Startup
38 SERVOSTAR
®
SBD-Series ST/CT Product Family
System Startup
Check the system wiring before applying power. It is important that the proper voltages are wired to the
appropriate terminals at the drive. It is extremely important that the system is properly grounded. The
motor frame should have a ground wire back to the frame of the drive. Voltage should not be applied to
any of the drive’s input control signals. These signals are controlled by leaving them open or tying them
to the drive’s common.
The phasing of the system must be correct. If either the armature or the tachometer is reverse-phased, the
velocity loop causes a potentially unsafe run away condition, allowing the motor to run uncontrolled.
When used inside a position loop, the command signal must be phased correctly or the position loop may
cause a run away condition.
INITIAL STARTUP
Most drives are shipped from the factory already configured for a particular motor. You can verify this by
checking the drive’s model number and comparing the compensation portion of the model number to both
the motor’s number and the applied voltage.
Caution must be taken when applying power to the drive. Any incorrect phasing or incorrect
compensation components may cause the motor to act uncontrollably. It is your
responsibility to be certain that damage to equipment or personnel cannot occur during
startup. Verify that the hardware Remote Enable input is disabled.
Power-Up Sequence
The SERVO
STAR
is insensitive to power-up sequence meaning that bus power or logic power can be
applied independently.
Enabling the System
With the input command signal at 0 volts, enable the drive. The green Enable LED should illuminate and
there should be no fault LEDs (red) illuminated. Be certain the motor does not run away. If the motor
does run away, the phasing of the armature or tachometer must be incorrect. Check the motor to see that
there is applied torque by carefully commanding velocity first in one direction and then the other.
Drive Tuning
The drive should control the motor in a proper servo-stability fashion where the system is responsive yet
stable. When using an external position loop controller the velocity loop is to be tuned first, independent
of the position loop. The AC Gain pot may be trimmed for best transient response for the system. If the
system is unstable, the system is going to require tuning by someone experienced in such maters. The
Control Loops section of this manual is also useful.
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