Network configuration
Distinction of the supply voltage with regard to
the different earthing methods TN, TT and IT
(see IEC 60364)
Power element
Converts the fixed voltage and frequency of the
mains into a variable voltage and frequency for
driving an electric motor. This means that the
rotational speed and torque are infinitely vari-
able. The power element consists of a rectifier,
intermediate circuit and inverted rectifier (out-
put stage).
Pulse width modulation (PWM)
Procedure for generating a three-phase, sinus-
oidal voltage from a DC voltage. Periodically
switching an identical magnitude on and off
creates an output magnitude of any desired
frequency and amplitude, based on the duty
cycle.
Resolver
Encoder that converts the angular position of a
rotor into an analogue value
Safe Torque Off (STO)
Stop function in accordance with EN
61800-5-2: "No power that can cause a rota-
tion (or in the case of a linear motor, a move-
ment) is supplied to the motor. The PDS(SR)
(electrical power drive system) does not supply
any power to the motor that can generate
torque (or in the case of a linear motor, force)."
Safety function
Function with a specific safety property, which
maintains the safe condition of the plant or pre-
vents hazardous conditions arising on the plant
Servo amplifier
Converter for servo motors, enabling controlled
operation of three-phase motors for dynamic
movements (closed loop)
Servo technology
Drive technology, in which the individual com-
ponents are so compatible that the overall sys-
tem achieves optimum dynamics and precision
Speed regulator
Regulates the difference between the speed
setpoint and the actual value to 0, output: cur-
rent setpoint
Glossary
Operating Manual PMCprotego D.48, PMCprotego D.72
1001735-EN-04
214
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