Encoder Module - ABB ACS800 Firmware Manual

200
Index Name/Selection

50 ENCODER MODULE

50.01 PULSE NR
0 ... 29999 ppr
50.02 SPEED MEAS MODE Defines how the encoder pulses are calculated.
-
A B DIR
-
-
A
- -
-
A B DIR
- -
- -
A B
- - - -
50.03 ENCODER FAULT
WARNING
FAULT
50.04 ENCODER DELAY
0 ... 50000 ms
50.05 ENCODER DDCS CH Defines the fibre optic channel of the control board from which the drive
CH 1
CH 2
50.06 SPEED FB SEL
INTERNAL
ENCODER
Actual signals and parameters
Description
Encoder connection. Visible only when a pulse encoder module (optional) is
installed and activated with parameter 98.01.
The settings will remain the same even though the application macro is
changed.
States the number of encoder pulses per one revolution.
Pulse number in pulses per round (ppr)
Channel A: positive edges calculated for speed. Channel B: direction.
Channel A: positive and negative edges calculated for speed. Channel B: not
used.
Channel A: positive and negative edges are calculated for speed. Channel B:
direction.
All edges of the signals are calculated.
Defines the operation of the drive if a failure is detected in communication
between the pulse encoder and the pulse encoder interface module, or
between the module and the drive. Encoder supervision function activates if
either of the following conditions is valid:
-The difference between the estimated and measured speed is greater than
20% of the motor nominal speed.
- No pulses are received from the encoder within the defined time (see
parameter 50.04) and the drive is simultaneously at the current or torque limit.
When the torque is zero or low, the shaft may not move and no pulses are
detected. This means that at low torque/current the missing-pulse-supervision
is not possible. Therefore there must be conditional torque or current limit in
the pulse supervision. Now the limit is the maximum torque/current, because
then the shaft is expected to move at least a little bit and at least some encoder
pulses are detected.
The drive generates a warning indication.
The drive trips on a fault, gives a fault indication and stops the motor.
Defines the time delay for the encoder supervision function at start (See
parameter 50.03).
Note: It the delay is set to 0 ms, encoder supervision at start is disabled.
Time delay
program reads the signals coming from the pulse encoder interface module.
The setting is valid only if the module is connected to the drive via the DDCS
link (that is not to the option slot of the drive).
Signals via channel 1 (CH1). The pulse encoder interface module must be
connected to CH1 instead of CH2 in applications where CH2 is reserved by a
Master station (For example, a Master/Follower application). See also
parameter 70.03.
Signals via channel 2 (CH2). Can be used in most cases.
Defines the speed feedback value used in control.
Calculated speed estimate
Actual speed measured with an encoder
FbEq
0 ... 29999
0
1
2
3
0
65535
0 ... 50000
1
2
65535
0