Johnson Controls York AYK550, User Manual

Page: 94 / 279

23
YORK, A Johnson Controls Company
$
2F_,=#3
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.
2F_#,=#3
23 =,2 ! 7 !2,2 4, #
2501
!*'#%#" B
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
!*'#%"& Q @` @` @`
>> Z > Z > Z
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
!*'#%* Q @` @` @`
>> Z > Z > Z
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
!*'#%F"& Q @` @` @`
>> Z > Z > Z
Sets the minimum limit for critical speed range 2.
• See parameter 2502.
2505
!*'#%F* Q @` @` @`
>> Z > Z > Z
Sets the maximum limit for critical speed range 2.
• See parameter 2503.
2506
!*'#%Q"& Q @` @` @`
>> Z > Z > Z
Sets the minimum limit for critical speed range 3.
• See parameter 2502.
2507
!*'#%Q* Q @` @` @`
>> Z > Z > Z
Sets the maximum limit for critical speed range 3.
• See parameter 2503.
f
output
52
46
23
18
f
REF
(Hz)
f1L
18 f2L
46 f1H
23 f2H
52