Name
Range
Step Default
Protection
functions
Description
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.
Table. 5.4.20 - 173. Pick-up settings.
Name
Description
Range
Step
Default
I
set
Pick-up setting
0.10…40.00xI
n
0.01xI
n
0.5xI
n
The pick-up activation of the function is not directly equal to the START signal generation of the
function. The START signal is allowed if the blocking condition is not active.
Operating time characteristics for trip and reset
This function supports definite time delay (DT). For detailed information on these delay types please
refer to the chapter "General properties of a protection function" and its section "Operating time
characteristics for trip and reset".
Read-only parameters
The relay's
Info page displays useful, real-time information on the state of the protection function. It is
accessed either through the relay's HMI display, or through the setting tool software when it is
connected to the relay and its Live Edit mode is active.
Table. 5.4.20 - 174. Information displayed by the function.
Name
Range
Description
I< LN behaviour
1: On
2: Blocked
3: Test
4: Test/Blocked
5: Off
Displays the mode of NUC block.
This parameter is visible only when
Allow setting of individual LN mode is enabled
in
General menu.
I< condition
0: Normal
1: Start
2: Trip
3: Blocked
Displays status of the protection function.
Expected operating
time
0.000...1800.000s Displays the expected operating time when a fault occurs.
Function blocking
The block signal is checked in the beginning of each program cycle. The blocking signal is received
from the blocking matrix in the function's dedicated input. If the blocking signal is not activated when
the pick-up element activates, a START signal is generated and the function proceeds to the time
characteristics calculation.
If the blocking signal is active when the pick-up element activates, a BLOCKED signal is generated and
the function does not process the situation further. If the START function has been activated before the
blocking signal, it resets and the release time characteristics are processed similarly to when the pick-
up signal is reset.
A
AQ
Q-M257
-M257
Instruction manual
Version: 2.07
© Arcteq Relays Ltd
IM00021
209
Summary of Contents for AQ-M257
Page 1: ...AQ M257 Motor protection IED Instruction manual...
Page 2: ......
