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Functional Description
4
Motor with SC speed controller
4.3
FG (core 6)
Digital output.
The digital output is a switch which switches to GND (open collector with integrated pull-up
resistance of 22 k
).
Output voltage: max. U
P
.
Output current: max. 15 mA.
The digital output can be configured for different tasks:
Error output
Output switches to high level if current limiting is activated. The delay between activation of
current limiting and activation of the output can be adjusted.
Output switches to low level if current limiting is deactivated.
Frequency output
Frequency output for reading out the actual motor speed.
Signal setup: 6 pulses per motor revolution.
1 revolution
NOTE
Pull-up resistance
An additional, external pull-up resistance can be connected to increase the edge steepness. The ma-
ximum loadability of the digital output must be noted and observed. See circuit diagram:
U
P
FG
1
6
3
GND
Ω
22
k
Ω
Due to the coupling of the internal pull-up resistance
between FG and the supply voltage U
P
, conducted elec-
tromagnetic RF interference, which affects the supply vol-
tage, can drastically worsen the frequency signal.
If operated properly and as intended, the speed and
direct of rotation of the motor are not impaired by this
interference.
