Encoder Support - ABB ACS880 Firmware Manual

30 Program features
Example
A fan has vibrations in the range of 540 to 690 rpm and 1380 to 1560 rpm. To make
the drive jump over these speed ranges,
• enable the critical speeds function by turning on bit 0 of parameter
speed function, and
• set the critical speed ranges as in the figure below.
Motor speed
(rpm)
1560
1380
690
540
Settings
Parameter groups
reference chain (page 135).


Encoder support

The program supports two single-turn or multiturn encoders (or resolvers). The
following optional interface modules are available:
• Absolute encoder interface FEN-11: absolute encoder input, TTL input, TTL
output (for encoder emulation and echo) and two digital inputs for position latching
• Resolver interface FEN-21: resolver input, TTL input, TTL output (for encoder
emulation echo) and two digital inputs for position latching
• HTL encoder interface FEN-31: HTL encoder input, TTL output (for encoder
emulation and echo) and two digital inputs for position latching.
The interface module is installed onto any option slot on the drive control unit, or onto
an FEA-xx extension adapter.
Quick configuration of HTL encoder feedback
1. Specify the type of the encoder interface module (parameter
= FEN-31) and the slot the module is installed into
2. Specify the type of the encoder
listing will be re-read from the drive after the value is changed.
Speed reference
1 2 3 4
(rpm)
22 Speed reference selection
(92.01 Encoder 1 type
1 Par. 22.52 = 540 rpm
2 Par. 22.53 = 690 rpm
3 Par. 22.54 = 1380 rpm
4 Par. 22.55 = 1560 rpm
(page 113) and 28 Frequency
91.11 Module 1 type
(91.12 Module 1
= HTL). The parameter
22.51 Critical
location).