236
Parameter listing and descriptions
ACH550-01 User's Manual
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
Range
2501
CRIT SPEED SEL
0=OFF, 1=ON
Sets the critical speeds function on or off. The critical speed function
avoids specific speed ranges.
0 =
OFF
– Disables the critical speeds function.
1 =
ON
– Enables the critical speeds function.
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
= 1.
• Set 2502
CRIT
SPEED
1
LO
= 18 Hz.
• Set 2503
CRIT
SPEED
1
HI
= 23 Hz.
• Set 2504
CRIT
SPEED
2
LO
= 46 Hz.
• Set 2505
CRIT
SPEED
2
HI
= 52 Hz.
2502
CRIT SPEED 1 LO
0…30000 rpm /
0…500 Hz
Sets the minimum limit for critical speed range 1.
• The value must be less than or equal to 2503
CRIT
SPEED
1
HI
.
• Units are rpm, unless 9904
MOTOR
CTRL
MODE
= 3 (
SCALAR
:
FREQ
), in
which case units are Hz.
2503
CRIT SPEED 1 HI
0…30000 rpm /
0…500 Hz
Sets the maximum limit for critical speed range 1.
• The value must be greater than or equal to 2502
CRIT
SPEED
1
LO
.
• Units are rpm, unless 9904
MOTOR
CTRL
MODE
= 3 (
SCALAR
:
FREQ
), in
which case units are Hz.
f
output
52
46
23
18
f
REF
(Hz)
f
1L
18
f
2L
46
f
1H
23
f
2H
52
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