ABB ACS880-104

90 Program features
For example, to read parameter 90.07 Load position scaled int through fieldbus, set
the selection parameter of the desired dataset (in group 52) to Other – 90.07, and
select the format. If you select a 32-bit format, the subsequent data word is also
automatically reserved.
Configuration of HTL encoder motor feedback
1. Specify the type of the encoder interface module (parameter 91.11 Module 1 type
= FEN-31) and the slot the module is installed into (91.12 Module 1 location).
2. Specify the type of the encoder (92.01 Encoder 1 type = HTL). The parameter
listing will be re-read from the drive after the value is changed.
3. Specify the interface module that the encoder is connected to (92.02 Encoder 1
source = Module 1).
4. Set the number of pulses according to encoder nameplate
(92.10 Pulses/revolution).
5. If the encoder rotates at a different speed to the motor (ie. is not mounted directly
on the motor shaft), enter the gear ratio in 90.43 Motor gear numerator and
90.44 Motor gear denominator.
6. Set parameter 91.10 Encoder parameter refresh to Refresh to apply the new
parameter settings. The parameter will automatically revert to Done.
7. Check that 91.02 Module 1 status is showing the correct interface module type
(FEN-31). Also check the status of the module; both LEDs should be glowing
green.
8. Start the motor with a reference of eg. 400 rpm.
9. Compare the estimated speed (01.02 Motor speed estimated) with the measured
speed (01.04 Encoder 1 speed filtered). If the values are the same, set the
encoder as the feedback source (90.41 Motor feedback selection = Encoder 1).
10. Specify the action taken in case the feedback signal is lost (90.45 Motor feedback
fault).
Example 1: Using the same encoder for both load and motor feedback
The drive controls a motor used for lifting a load in a crane. An encoder attached to
the motor shaft is used as feedback for motor control. The same encoder is also used
for calculating the height of the load in the desired unit. A gear exists between the
motor shaft and the cable drum. The encoder is configured as Encoder 1 as shown in
Configuration of HTL encoder motor feedback above. In addition, the following
settings are made:
•(90.43 Motor gear numerator = 1)
•(90.44 Motor gear denominator = 1)
(No gear is needed as the encoder is mounted directly on the motor shaft.)
• 90.51 Load feedback selection = Encoder 1