Term Definition - KEB COMBIVERT F4-F Applications Manual

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13.1.2 Term Definition

Analog/Digital Earth
EMC
Energy-saving Function
Frequency-dependent Switch
Actual value
LA-Stop
RS232/485
Setpoint Value
Speed Search
Stall
© KEB Antriebstechnik, 1999
All Rights reserved
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.
Electromagnetic compatibility; the guidelines for the reduction of interferences emitted
by units as well as the safety of operation of troubled units.
When motors run at no-load the voltage can be lowered once this state is reached
thereby saving energy.
Relay or transistor output which switches dependent of a preadjusted frequency.
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.
Acceleration stop prevents overcurrent errors during acceleration by stopping the
ramp. The current level is determined through the max. ramp current (CP.14).
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.
The analog and digital preset values with which the frequency inverter shall operate.
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.
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.
Name: Basis
KEB COMBIVERT F4-F
Annex
ANTRIEBSTECHNIK
Date Chapter Section
13 1
21.06.99
13
Page
9