Speed measurement
© KEB, 2012-10 COMBIVERT F5-A, -E, -H Page 7.11 - 17
7
The set-dependent gear factors are now realised through the different values for oP.52 "motor potentiometer
value". For that purpose, the following setting have to be made :
Set 0...2: oP.53 Motor potentiometer min.
value =
-100%
Set 0...2: oP.54 Motor potentiometer
max. value =
100%
Set 0: oP.52 Motor potentiometer va-
lue =
-100%
Set 1: oP.52 Motor potentiometer va-
lue =
0
Set 2: oP.52 Motor potentiometer va-
lue =
100%
7.11.9 Emulation mode
The encoder emulation is parameterized with parameter Ec.27.
Condition: The inverter contains an encoder interface; one channel is an encoder emulation or one channel can
be changed over to encoder emulation.
The encoder interfaces of the respective inverter can be read out in parameter Ec.00 „encoder 1 interface“ or
Ec.10 „encoder 2 interface".
Ec.27: Emulation mode
Bit Function Value Description
0, 1 Source
0: Channel 1
The increments of the encoder at channel 1 (programmable and rea-
dable via Ec.01) are output via encoder emulation at channel 2.
1: Channel 2
This value is without function, because there is no encoder interface
with encoder emulation available via channel 1
2: Actual va-
lue (ru.07)
The displayed speed in ru.07 „actual value“ is output via the emula-
tion. It does not matter, whether this speed is a measured or calcu-
lated value. The increments per revolution of the emulation must be
selected with bit 2, 3 „actual value“.
Attention: No zero signal is output!
3: Actual va-
lue (Ec.29)
The position difference detected by the encoder interface in channel 1
is output every 125µs without error to the encoder emulation. There is
a delay of 500 µs. The zero pulse emulation is active for the adjusted
increments per revolution. The zero pulse is not synchronous with that
of the encoder. It will come after power off/on at another place, but it
make sence to correct error increments at the evaluation of pulses in
the slave, e.g. by malfunctions. Thus "synchronous running" is guaran-
teed for days / weeks.
Limitations:
→ To use the function of the zero pulse emulation, only the following
increments per revolution can be adjusted: 256/512/1024/2048 inc.
→
The increments per revolution of encoder source channel 1 must be
a multiple of two in order to use the zero pulse emulation.
→ If the output switching frequency is switched to 12kHz and back,
error increments are theoretically possible.
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