ANTRIEBSTECHNIK
13
1
9
KEB COMBIVERT F4-C
Name: Basis
25.03.98
13
Annex
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KEB Antriebstechnik, 1997
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Chapter
13.1.2 Term Definition
Analog/Digital Earth
The COMBIVERT F4 has isolated digital inputs, i.e. the inputs are galvanically
separated from the internal potential. Thus equalizing currents between the components
are avoided. The digital earth is the reference point of this separated control circuit. The
analog earth is directly connected with the inverter ground, it serves as potential for the
analog setpoint setting.
EMC
Electromagnetic compatibility; the guidelines for the reduction of interferences emitted
by units as well as the safety of operation of troubled units.
Energy-saving Function
When motors run at no-load the voltage can be lowered once this state is reached
thereby saving energy.
Frequency-dependent Switch
Relay or transistor output which switches dependent of a preadjusted frequency.
Actual value
At a closed-loop controlled system it is the feedback value supplied by the external
detection. At controlled systems it is the value calculated on the basis of the adjusted
conditions.
LA-Stop
Acceleration stop prevents overcurrent errors during acceleration by stopping the ramp.
The current level is determined through the max. ramp current (CP.14).
RS232/485
RS232, standardized serial interface for max. 1 end unit at a max. line length of 15 m.
RS485, standardized serial interface for max. 240 end units and 1000 m line lengths.
Setpoint Value
The analog and digital preset values with which the frequency inverter shall operate.
Speed Search
Speed Search prevents overcurrent errors at the connection to rotating motors. The
motor speed is indirectly determined , the inverter accelerates only after it has adapted
its rotary speed.
Stall
The Stall function protects the inverter from switch off due to overcurrent at constant
output frequency. On exceeding the level adjusted with CP.15 the output frequency is
reduced until the value is again below the adjusted value.
