ABB ACH550-01 User Manual page 253

ACH550 User's Manual
Code Description
3013 UNDERLOAD FUNCTION
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 = – Underload protection is not used.
NOT SEL
1 = – When the protection is activated the drive coasts to stop. A
FAULT
fault indication is displayed.
2 = – An alarm indication is displayed.
ALARM
3014 UNDERLOAD TIME
Time limit for underload protection.
3015 UNDERLOAD CURVE
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
• T = nominal torque of the motor.
M
• ƒ = nominal frequency of the motor.
N
T
M
(%)
Underload curve types
80
60
40
20
0
Parameter listing and descriptions
.
.
.
MOTOR NOM FREQ
1
ƒ
N
Range
0...2
10...400 s
1...5
3
2
5
4
2.4 * ƒ
70%
50%
30%
f
N
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