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Group 25: CRITICAL SPEEDS
This group defines up to three critical speeds or ranges of
speeds that are to be avoided due, for example, to mechanical
resonance problems at certain speeds.
Code Description
2501 CRIT SPEED SEL
Sets the critical speeds function on or off. The critical speed function
avoids specific speed ranges.
0 =
– Disables the critical speeds function.
OFF
1 =
– Enables the critical speeds function.
ON
Example: To avoid speeds at which a fan system vibrates badly:
• Determine problem speed ranges. Assume they are found to be
18...23 Hz and 46...52 Hz.
• Set 2501
CRIT SPEED SEL
• Set 2502
CRIT SPEED
• Set 2503
CRIT SPEED
• Set 2504
CRIT SPEED
• Set 2505
CRIT SPEED
52
46
23
18
2502 CRIT SPEED 1 LO
Sets the minimum limit for critical speed range 1.
• The value must be less than or equal to 2503
• Units are rpm, unless 9904
which case units are Hz.
2503 CRIT SPEED 1 HI
Sets the maximum limit for critical speed range 1.
• The value must be greater than or equal to 2502
• Units are rpm, unless 9904
which case units are Hz.
236
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= 1.
1
= 18 Hz.
LO
1
= 23 Hz.
HI
2
= 46 Hz.
LO
2
= 52 Hz.
HI
f
output
f
f
f
1L
1H
2L
18
23
46
MOTOR CTRL MODE
MOTOR CTRL MODE
Parameter listing and descriptions
ACH550-01 User's Manual
Range
0=OFF, 1=ON
f
(Hz)
REF
f
2H
52
0...30000 rpm /
0...500 Hz
CRIT SPEED
= 3 (
SCALAR
0...30000 rpm /
0...500 Hz
CRIT SPEED
= 3 (
SCALAR
1
.
HI
:
), in
FREQ
1
.
LO
:
), in
FREQ
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