148 Program features
Settings
Parameters 3010 STALL FUNCTION, 3011 STALL FREQUENCY and 3012 STALL
TIME
Motor thermal protection
The motor can be protected against overheating by activating the Motor thermal
protection function.
The drive calculates the temperature of the motor on the basis of the following
assumptions:
• The motor is in the ambient temperature of 30 °C (86 °F) when power is applied to
the drive.
• Motor temperature is calculated using either the user-adjustable or automatically
calculated motor thermal time constant and motor load curve (see the figures
below). The load curve should be adjusted if the ambient temperature exceeds
30 °C (86 °F).
Settings
Parameters 3005 MOT THERM PROT, 3006 MOT THERM TIME, 3007 MOT LOAD
CURVE, 3008 ZERO SPEED LOAD and 3009 BREAK POINT FREQ
Note: It is also possible to use the motor temperature measurement function. See
section Motor temperature measurement through the standard I/O on page 157.
Underload protection
Loss of motor load may indicate a process malfunction. The drive provides an
underload function to protect the machinery and process in such a serious fault
condition. Supervision limits - underload curve and underload time - can be specified
as well as the action taken by the drive upon the underload condition (alarm
indication / fault indication & drive stop / no reaction).
}
Motor
load
Temp.
rise
100%
63%
Motor thermal time constant
t
100 =
127%
150
50
P 3007
P 3008
f
Output current relative (%) to
nominal motor current
P 3009
100%
Break point
Motor load curve
Zero speed load
t
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