96 Functional description CG Drives & Automation 01-7492-01r1
Motor Sound [22A]
Encoder Feedback [22B]
Only visible if the Encoder option board is installed. This
parameter enables or disables the encoder feedback from the
motor to the AC drive.
Encoder Pulses [22C]
Only visible if the Encoder option board is installed. This
parameter describes the number of pulses per rotation for
your encoder, i.e. it is encoder specific. For more
information please see the encoder manual.
Encoder Speed [22D]
Only visible if the Encoder option board is installed and
added in menus 1x0. This parameter shows the measured
motor speed. To check if the encoder is correctly installed,
set Encoder Feedback [22B] to Off, run the AC drive at any
speed and compare with the value in this menu. The value
in this menu [22D] should be about the same as the motor
speed [230]. If you get the wrong sign for the value, swap
encoder input A and B.
Motor PWM [22E]
Menus for advanced setup of motor modulation properties
PWM = Pulse Width Modulation).
PWM Fswitch [22E1]
Set the PWM switching frequency reference of the AC drive.
* Maximum is 8 kHz if [222] Motor freq > 400 Hz and if
< 400 Hz max remains at 6 kHz.
** The switching frequency is internally reduced down to
minimum 1.5 kHz if the IGBT temperature is too high.
22A Motor Sound
Default:
F
(“Advanced” for models 48-293/295 and
48-365)
F 1 Switching frequency 3 kHz
Advanced 4
Switching frequency and PWM mode
setup via [22E]
22B Encoder
Default: Off
Off 0 Encoder feedback disabled
On 1 Encoder feedback enabled
22C Enc Pulses
Default: 1024
Range: 5–16384
22D Enc Speed
Unit: 0rpm
Resolution: speed measured via the encoder
NOTE: If accessed via communication, the signal is
unreliable at speeds outside -32768 ... 32767.
Note: Menus [22E1] - [22E3] are only visible if [22A] is
set to “Advanced”.
22E1 PWM Fswitch
Default:
3000 Hz
(2 kHz for models 48-293/295 and
48-365)
Range 1.50 - 6.00kHz * **
Resolution 0.01kHz
NOTE: At switching frequencies >3 kHz derating may
become necessary.
NOTE: If the heat sink temperature gets too high the
switching frequency is decreased to avoid tripping.
This is done automatically in the AC drive. The default
switching frequency is 3 kHz.
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