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Parameter listing and descriptions
241
ACH550 User's Manual
3013
UNDERLOAD FUNCTION
0…2
Removal of motor load may indicate a process malfunction. The
protection is activated if:
• The motor torque drops below the load curve selected by parameter
3015
UNDERLOAD
CURVE
.
• This condition has lasted longer than the time set by parameter 3014
UNDERLOAD
TIME
.
• Output frequency is higher than 10% of the nominal frequency.
0 =
NOT
SEL
– Underload protection is not used.
1 =
FAULT
– When the protection is activated the drive coasts to stop. A
fault indication is displayed.
2 =
ALARM
– An alarm indication is displayed.
3014
UNDERLOAD TIME
10…400 s
Time limit for underload protection.
3015
UNDERLOAD CURVE
1…5
This parameter provides five selectable curves shown in the figure.
• If the load drops below the set curve for longer than the time set by
parameter 3014, the underload protection is activated.
• Curves 1…3 reach maximum at the motor rated frequency set by
parameter 9907
MOTOR
NOM
FREQ
.
• T
M
= nominal torque of the motor.
• ƒ
N
= nominal frequency of the motor.
Code Description
Range
80
60
40
20
0
2.4 * ƒ
N
3
2
1
5
4
T
M
70%
50%
30%
ƒ
N
(%)
Underload curve types
f
Содержание ACH550-01
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