Group 25: Critical Speeds - Daikin ACS320 Operation 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 .
Table 35: Group 25: Critical Speeds
Code Description
2501 CRIT SPEED SEL
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
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 SPEED), then 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 CRIT SPEED 1 LO .
• Units are rpm, unless 9904 MOTOR CTRL MODE = 3 (SCALAR SPEED), then units are Hz .
2504 CRIT SPEED 2 LO
Sets the minimum limit for critical speed range 2 .
• See parameter 2502,
2505 CRIT SPEED 2 HI
Sets the maximum limit for critical speed range 2 .
• See parameter 2503,
2506 CRIT SPEED 3 LO
Sets the minimum limit for critical speed range 3 .
• See parameter 2502,
2507 CRIT SPEED 3 HI
Sets the maximum limit for critical speed range 3 .
• See parameter 2503,
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CTual Ignals and arameTers
Range Resolution Default
0, 1 1
0 .0...500 .0 Hz 0 .1 Hz 0 .0 Hz
0 .0...500 .0 Hz 0 .1 Hz 0 .0 Hz
0 .0...500 .0 Hz 0 .1 Hz 0 .0 Hz
0 .0...500 .0 Hz 0 .1 Hz 0 .0 Hz
0 .0...500 .0 Hz 0 .1 Hz 0 .0 Hz
0 .0...500 .0 Hz 0 .1 Hz 0 .0 Hz
OM 1190-1 • MD4 VFD
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0