ABB ACS355 User Manual

332 Fieldbus control with fieldbus adapter
Fieldbus references
 Reference selection and correction
Fieldbus reference (called COMM in signal selection contexts) is selected by setting a
reference selection parameter – 1103 REF1 SELECT or 1106 REF2 SELECT – to
COMM, COMM+AI1 or COMM*AI1. When parameter 1103 or 1106 is set to COMM,
the fieldbus reference is forwarded as such without correction. When parameter 1103
or 1106 is set to COMM+AI1 or COMM*AI1, the fieldbus reference is corrected using
analog input AI1 as shown in the following examples for the DCU profile.
With the DCU profile the fieldbus reference type can be Hz, rpm or percent. In the
following examples the reference is in rpm.
Setting When COMM > 0 rpm When COMM < 0 rpm
COMM
+AI1
COMM/1000 + (AI(%) - 50%) · (MAX-MIN) COMM/1000 + (AI(%) - 50%) · (MAX-MIN)
Maximum limit is defined by parameter 1105 REF1 MAX / 1108 REF2 MAX.
Minimum limit is defined by parameter 1104 REF1 MIN / 1107 REF2 MIN.
AI = 50%
AI = 100%
AI = 0%
1500
Corrected
reference (rpm)
750
0
Max. limit
Min. limit
COMM
REF
15000007500000
AI = 50%
AI = 0%
AI = 100%
COMM
REF
Corrected
reference (rpm)
0
-7500
-1500
-1500000 -750000 0
Max. limit
Min. limit
AI = 50%
AI = 100%
AI = 0%
Corrected
reference (rpm)
Max limit
Min limit
COMM
REF
0
1500
750
0
1200
300
750000 1500000
AI = 50%
AI = 0%
AI = 100%
COMM
REF
0
-750
-1500
0
-300
-1200
Corrected
reference (rpm)
Max. limit
Min. limit
-750000-1500000

ABB ACS355 Specifications

General

Input Voltage	200 V to 240 V AC, 380 V to 480 V AC
Frequency	47 Hz to 63 Hz
Control Method	Scalar control
Protection Features	Overcurrent, Overvoltage, Undervoltage, Overtemperature, Short circuit
Communication Interfaces	Modbus RTU, CANopen
Enclosure Rating	IP20
Operating Temperature	-10°C to +50°C (14°F to 122°F)
Storage Temperature	-40°C to +70°C (-40 to +158 °F)
Humidity	95% RH (non-condensing)
Altitude	Up to 1000 m (3280 ft) without derating