148 Program features
Settings
Parameters
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
,
,
and
Note:
It is also possible to use the motor temperature measurement function. See
section
Motor temperature measurement through the standard I/O
on page
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
P
f
Output current relative (%) to
nominal motor current
P
100%
Break point
Motor load curve
Zero speed load
t
Summary of Contents for ACS355 series
Page 1: ...ABB machinery drives User s manual ACS355 drives ...
Page 4: ......
Page 16: ...16 ...
Page 32: ...32 Operation principle and hardware description ...
Page 58: ...58 Electrical installation ...
Page 74: ...74 Start up control with I O and ID run ...
Page 106: ...106 Control panels ...
Page 120: ...120 Application macros ...
Page 178: ...178 Program features ...
Page 338: ...338 Fieldbus control with embedded fieldbus ...
Page 368: ...368 Fault tracing ...
Page 404: ...404 Dimension drawings ...
Page 410: ...410 Appendix Resistor braking ...
Page 434: ...434 Appendix Permanent magnet synchronous motors PMSMs ...