Pick-up
The
I
set
setting parameter controls the the pick-up of the I< function. This defines the minimum allowed
measured current before action from the function. The function constantly calculates the ratio
between the
I
set
and the measured magnitude (
I
m
) for each of the three phases. The reset ratio of
103 % is built into the function and is always relative to the
I
set
value. The setting value is common for
all measured phases. When the
I
m
exceeds the
I
set
value (in single, dual or all phases) it triggers the
pick-up operation of the function.
Table. 5.3.20 - 169. Motor data settings.
Name
Range
Step Default
Protection
functions
Description
Motor In
Scaled
0.1... 40.0
x I
n
0.1 x
I
n
-
- Motor status
monitoring
- Machine
thermal
overload
protection
(Tm>; 49M)
- Motor
starting
monitoring
(Ist>; 48)
- Undercurrent
(I<; 37)
- Load jam
protection
(Im>; 51M)
The motor's nominal current scaled to per unit. If the user selects
Object In in the CT settings, this value should be 1.00. If scaled to
the CT nominal, this value may vary.
Motor In
A
0.1...5,000
A
0.1 A -
- Motor status
monitoring
- Machine
thermal
overload
protection
(Tm>; 49M)
- Motor
starting
monitoring
(Ist>; 48)
- Undercurrent
(I<; 37)
- Load jam
protection
(Im>; 51M)
The motor's nominal current in amperes.
No load
current<
0.1…40.0
x I
n
0.1 x
I
n
0.2 x I
n
- Motor status
monitoring
- Machine
thermal
overload
protection
(Tm>; 49M)
- Undercurrent
(I<; 37)
The motor's no load current. This setting defines the "Stopped"
condition when the current is below this setting value. Also, when
the current is below this value, the undercurrent protection stage
is locked.
No load
current<
A
0.1...5 000
A
0.1 A -
- Motor status
monitoring
- Machine
thermal
overload
protection
(Tm>; 49M)
- Undercurrent
(I<; 37)
The motor's no load current in amperes.
A
AQ
Q-M255
-M255
Instruction manual
Version: 2.06
© Arcteq Relays Ltd
IM00020
205
Summary of Contents for AQ-M255
Page 1: ...AQ M255 Motor protection IED Instruction manual...
Page 2: ......
