D.6
SEL-387-0, -5, -6 Relay Instruction Manual Date Code 20170601
Configuration, Fast Meter, and Fast Operate Commands
Message Definitions
A5D1 Request
In response to the A5D1 request, the relay sends the following block.
A5B9 Fast Meter
Status Acknowledge
Message
In response to the A5B9 request, the SEL-387 clears the Settings change
(STSET) bit in the Status Byte of the Fast Meter messages (A5D1, A5D2, and
A5D3). The bit is set on power up and on settings changes. If the STSET bit is
set, the external device should request the A5C1, A5C2, and A5C3 messages
to determine if the scale factors or line configuration parameters have been
modified. No return response is given to the A5B9 request.
A5C2/A5CE Demand/
Peak Demand
In response to the A5C2 or A5C3 request, the relay sends the following block.
xxxxxxxx Scale factor (200 * Inom) * CTR1 Winding 1
xxxxxxxx Scale factor (200 * Inom) * CTR2 Winding 2
xxxxxxxx Scale factor (200 * Inom) * CTR3 Winding 3
xxxxxxxx Scale factor (200 * Inom) * CTR4 Winding 4
3C23D70A Scale factor (1/100)
00 Reserved
xx Checksum
Table D.4 A5C1 Fast Meter Configuration Block (Sheet 4 of 4)
Data Description
Table D.5 A5D1 Fast Meter Data Block
Data Description
A5D1 Command
80 Message length (128 bytes)
xx Status byte
Bit: 2; Usage: Self-test warning
Bit: 3; Usage: Self-test warning
Bit: 4, Usage: Settings change
52 bytes Integers for the following: IAW1, IBW1, ICW1, IAW2,
IBW2, ICW2, IAW3, IBW3, ICW3, IAW4, IBW4, ICW4,
VDC (Imaginary values first, followed by Real values.
8 bytes Time stamp
63 bytes Digital banks - targets 0-62
xx Checksum
NOTE: The Imaginary value for VDC
is always zero.
Table D.6 A5C2/A5C3 Demand/Peak Demand Fast Meter Configuration
Messages (Sheet 1 of 4)
Data Description
A5C2 or A5C3 Command; Demand (A5C2) or Peak Demand (A5C3)
DA Message length (218 bytes)
00 No status byte
01 Scale factors in fast meter configuration
00 No scale factors used
14 20 analog input channels
01 One sample per channel
00 No digital banks
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