Underload Protection; Earth Fault Protection; Incorrect Wiring - ABB ACS355 User Manual

146 Program features
.
Motor
load
100%
Temp.
rise
100%
63%
Motor thermal time constant
Settings
Parameters 3005...3009
Note: It is also possible to use the motor temperature measurement function. See
section Motor temperature measurement through the standard I/O

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).
Settings
Parameters 3013...3015

Earth fault protection

The Earth fault protection detects earth faults in the motor or motor cable. The
protection can be selected to be active during start and run or during start only.
An earth fault in the input power line does not activate the protection.
Settings
Parameter 3017 EARTH FAULT

Incorrect wiring

Defines the operation when incorrect input power cable connection is detected.
150
t
P 3007 100 =
127%
50
P 3008
t
Output current relative (%) to
motor nominal current
Break point
Motor load curve
Zero speed load
P 3009
on page 155.
f