ABB PST72 Installation And Maintenance Manual

Chapter 10
Functions
10:22 Underload protection
Path in menu:
Menu/SETTINGS/Functional Settings/
Protections/Underload
If the motor current falls below the set level and the set time when the motor is running at
full voltage, the protection is activated. The protection starts monitoring when full voltage is
applied to the motor.
Parameter text Default value Setting range Description
Underload No Yes, No Underload protection
Information!
This protection could be used to avoid for example a pump running dry or detecting a
broken belt.
10:23 Underload protection level
Path in menu:
Menu/SETTINGS/Functional Settings/
Protections/Underload/Underl Lev
This parameter makes it possible to set the level of the underload protection. It is active only
if the underload protection is selected.
Parameter text Default value Setting range Description
Underl Lev 0.5 x Ie 0.4...0.8xle
Trip level for Underload
protection
10:24 Underload protection time
Path in menu:
Menu/SETTINGS/Functional Settings/
Protections/Underload/Underl Time
This parameter makes it possible to set the delay time from detection until the protection is
activated. It is active only if underload protection is selected.
Parameter text Default value Setting range Description
Underl Time 10s 1....30s
Trip time for Underload
protection
10:25 Underload protection, type of operation
Path in menu:
Menu/SETTINGS/Functional Settings/
Protections/Underload/Underl Op
This parameter makes it possible to select between three different actions when the protec-
tion is activated. It is active only if the underload protection is selected.
Stop-M The motor stops and a manual reset is required before restart
Stop-A The motor stops and an automatic reset is performed when the fault
disappears
Ind The motor continues to run but a fault indication is given
Parameter text Default value Setting range Description
Underl Op Stop-M Stop-M, Stop-A, Ind
Type of operation for
Underload protection
10:26 Phase imbalance protection
Path in menu:
Menu/SETTINGS/Functional Settings/
Protections/Phase Imb
If the current in one phase differs from another phase by more than the set level, the protec-
tion is activated. The protection starts monitoring 30 seconds after full voltage and trips after
10 seconds of imbalance.
Parameter text Default value Setting range Description
Phase Imb No Yes, No Phase imbalance protection
10.8 Low Voltage Products & Systems
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10

ABB PST72 Specifications

General

Brand	ABB
Model	PST72
Category	Controller
Language	English