2916
45
SYN1
36
SYN3 Volt diff Ok
2917
45
SYN1
37
SYN3 Volt diff out of setting
2918
45
SYN1
38
SYN3 Angle diff Ok
2919
45
SYN1
39
SYN3 Angle diff out of setting
2920
45
SYN1
40
SYN3 Frequency diff Ok
2921
45
SYN1
41
SYN3 Frequency diff out of setting
2922
45
SYN1
42
SYN1 Switch On
2923
45
SYN1
43
SYN1 Switch Off
2924
45
SYN1
44
SYN2 Switch On
2925
45
SYN1
45
SYN2 Switch Off
2926
45
SYN1
46
SYN3 Switch On
2927
45
SYN1
47
SYN3 Switch Off
5.5.6. mA Output control
The milliamp current loop is the prevailing process control signal in many industries. It is an ideal
method of transferring process information because current does not change as it travels from
transmitter to receiver. It is also much simpler and cost effective.
Bene ts of 4...20mA loops:
The 4-20 mA current loop is the dominant standard in many industries.
It is the simplest option to connect and con gure.
It uses less wiring and connections than other signals, greatly reducing initial setup costs.
Better for traveling long distances, as current does not degrade over long connections like
voltage.
It is less sensitive to background electrical noise.
Since 4 mA is equal to 0% output, it is incredibly simple to detect a fault in the system.
Milliamp outputs
Up to two independent milliamp option cards are supported. Each card has 4 milliamp -outputs and
one milliamp -input. If the IED has milliamp option card, enable mA-outputs by selecting:
Control
→
Device IO
→
mA Outputs
:
Figure. 5.5.6. - 135. Milliamp outputs are activated two at the time, channel 1&2 / channel 3&4 activation. Option card order
code is “I”.
Table. 5.5.6. - 198. Main settings of the mA outputs
Name
Range
Default
Description
mA option card 1
Enable mA Out Channels 1&2
0:Disabled
1:Enabled
0:Disabled
Enables mA output cards outputs.
Enable mA Out Channels 3&4
AQ-T257
Instruction manual
Version: 2.00
© Arcteq Relays Ltd
252
