Operating instructions

Commissioning (software)
2.8 Encoder Commissioning
Control Units CU240S
Operating Instructions (Compact), 04/2006, A5E00766042B AA
2-57
Parameter Name Values
1 Yes
0 No Bit 03 - Encoder low speed loss
1 Yes
0 No Bit 05 - Single edge measurement
1 Yes
P0405 Encoder pulse
types
Enables selection of various pulse types. Only bits 04 and 05 are used
for the SINAMICS G120. See parameter list.
P0408[3] Pulses per
revolution
Specifies the number of encoder pulses per revolution
P0491[3] Reaction on
speed signal
loss
Selects reaction on loss of speed signal. Settings:
0: Do not change to SLVC
1: Change to SLVC
P0492[3] Allowed
speed
difference
Used for high speed encoder loss detection.
Selects the allowable difference in calculated speed signals between
samples before it is considered to have lost the speed signal feedback.
(Default = Calculated from inertia, range from 0 to 100.00)
Dependency: Parameter is updated when P0345 Motor start-up time is
changed or when a speed loop optimization is performed (P1960 = 1).
There is a fixed delay of 40 mS before acting upon loss of encoder at
high speeds.
Caution: When allowed speed difference is set to 0, then both high
speed and low speed encoder loss detection is disabled, encoder loss
will not be detected.
If encoder loss detection is disabled and encoder loss occurs, then
operation of the motor may become unstable.
P0493[3] Speed
difference
Allowed difference between encoder and observer.
P0494[3] Delay speed
loss reaction
Used for low speed encoder loss detection.
If the motor shaft speed is less than the value in P0492 then encoder
loss is detected using a low speed encoder loss detection algorithm.
This parameter selects the delay between loss of encoder at low speed
and reaction to the encoder loss. (Default = Calculated from inertia,
Range from 0 to 64.000s).
Dependency: This parameter is updated when P0345 Motor start-up
time is changed or when a speed-loop optimization is performed
(P1960 = 1).
Caution: When this delay is set to 0, then low speed encoder loss
detection is disabled and low speed encoder loss cannot be detected
(high speed encoder loss detection will still operate if P0492 > 0). If low
speed encoder loss detection is disabled and encoder should be lost at
low speed, then operation of motor may become unstable.
P1300 Control Mode 21: Closed loop speed control
23: Closed loop torque control