Actual signals and parameters 207
DI1 Digital input DI1. 1 = ramp input is forced to zero. Ramp
output ramps to zero according to the used ramp time.
1
DI2 See selection DI1. 2
DI3 See selection DI1. 3
DI4 See selection DI1. 4
DI5 See selection DI1. 5
COMM Fieldbus interface as the source for forcing ramp input to
zero, ie Control word 0301 FB CMD WORD 1 bit 13 (with
ABB drives profile 5319 EFB PAR 19 bit 6). The Control
word is sent by the fieldbus controller through the
embedded fieldbus (Modbus) to the drive. For the Control
word bits, see sections DCU communication profile on page
307 and ABB drives communication profile on page 302.
7
DI1(INV) Inverted digital input DI1. 0 = ramp input is forced to zero.
Ramp output ramps to zero according to the used ramp
time.
-1
DI2(INV) See selection DI1(INV). -2
DI3(INV) See selection DI1(INV). -3
DI4(INV) See selection DI1(INV). -4
DI5(INV) See selection DI1(INV). -5
25 CRITICAL
SPEEDS
Speed (output frequency) bands within which the drive is not
allowed to operate.
2501 CRIT SPEED
SEL
Activates/deactivates the critical speeds function. The
critical speed function avoids specific output frequency
ranges.
Example: A fan has vibrations in the range of 18 to 23 Hz
and 46 to 52 Hz. To make the drive to jump over the
vibration frequency ranges:
• Activate the critical speeds function.
• Set the critical frequency ranges as in the figure below.
OFF
OFF Inactive 0
ON Active 1
2502 CRIT SPEED 1
LO
Defines the minimum limit for critical output frequency range
1
0.0 Hz
0.0…500.0 Hz Limit in Hz. The value cannot be above the maximum
(parameter 2503 CRIT SPEED 1 HI).
1 = 0.1 Hz
All parameters
No. Name/Value Description Def/FbEq
18
23
46
52
1Par. 2502 = 18 Hz
2Par. 2503 = 23 Hz
3Par. 2504 = 46 Hz
4Par. 2505 = 52 Hz
1234
f
output
(Hz)
f
reference
(Hz)
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