39 Glossary
C
Clock clock signal
Common-mode voltage the disturbance amplitude that can be compensated for by a differential analog input
Continuous power of the regen circuit the average power that can be dissipated in the regen circuit
Counts internal count pulses, 1 pulse = 1/2
20
turn
-1
Current controller
regulates the difference between the current setpoint and the actual current to 0.
Output: power-output voltage
D
DC-link (bus) voltage rectified and smoothed power voltage
Disable removal of the ENABLE signal (0V or open)
E
EEPROM
electrically erasable memory in the servo amplifier, data that are stored in the
EEPROM are not lost if the auxiliary voltage is switched off
Enable the enable signal for the servo amplifier (+24V)
Earth short electrically conductive connection between a phase and PE
F
speed limit maximal value for the speed normalization at ±10V
G
GRAY-code a special way of representing binary numbers
H
Holding brake a brake in the motor, that can only be applied when the motor is at standstill
I
I²t threshold monitoring of the r.m.s. current that is actually drawn
Incremental encoder interface
position indication through 2 signals with a 90° phase difference, not an absolute
position output
Ipeak, peak current the r.m.s. value of the pulse current
Irms, r.m.s. current the r.m.s. value of a steady current
K
KP, P-gain proportional gain of a control loop
L
Limit-switch
to limit the range of movement of the machine; implemented as an n.c. (break)
contact
M
Machine
the total assembly of parts or devices that are connected together, of which at least
one is movable
Monitor output output of an analog measurement
Motion block
a packet of data containing all the position parameters that are required for a motion
task
Multi-axis system a machine with several independent drive axes
O
Optocoupler optical connection between two electrically independent systems
P
P controller a control loop that has purely proportional response
Phase shift
compensation for the lag between the electromagnetic and the magnetic field in the
motor
PID controller control loop with proportional, integral and differential response
PID-T2 filter time constant for the speed controller output
Position controller
regulates the difference between the position setpoint and the actual position to 0.
Output: speed setpoint
Pulse power of the regen circuit the maximum power that can be handled by the regen circuit
R
RAM
volatile memory in the servo amplifier. Data that are stored in the RAM are lost when
the auxiliary voltage is switched off.
Regen circuit
converts superfluous (regenerative) energy that is fed back by the motor, during
braking, into heat in the regen resistor.
Reset new start of the microprocessor
Reversing mode operating with a periodic change of direction
ROD interface incremental position output
S
Servo amplifier an instrument for controlling the torque, speed and position of a servomotor
Short-circuit here: electrically conductive connection between two phases
Speed controller
regulates the difference between the speed setpoint SW and the actual speed to 0.
Output: current setpoint
SSI interface cyclically absolute, serial position output
Setp. ramps limiting of the rate of change of the speed setpoint value
T
Tacho voltage a voltage proportional to the actual speed
T-tacho, tacho time constant filter time constant in the speed feedback of the control loop
Tn, integration time integral component of the control loop
Z
Zero pulse/mark is produced by incremental encoders, once per turn, used to zero the machine
Setup Software 97
BECKHOFF 07/03 Glossary
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