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5.2.3
Communications
COMMUNICATIONS
5–10
protection or function timing in any way. It can be used to steady the display when
readings are bouncing.
•
MOTOR LOAD FILTER INTERVAL: This value (when non-zero) averages current and
power factor for the programmed number of cycles using a running average
technique. This settings is intended for use on synchronous motors running at low
RPM and driving reciprocating loads. The number of cycles to average can be
determined by using current waveform capture. The number of cycles to complete
one stroke can be determined from this waveform. This value can be used as the
starting point for the motor load filter interval. Additional fine tuning may be required.
This settings is not seen if
This averaging may increase trip/alarm times by 16.7 ms for every cycle averaged.
Serial Communications
The following settings appear when the relay is ordered with the regular enhanced (E)
option.
PATH: SETTINGS
S1 469 SETUP
[
MESSAGE
MESSAGE
MESSAGE
MESSAGE
The 469 has three (3) serial communications ports supporting a subset of the Modbus
protocol (Refer to GEK-106491C: 469 Communications Guide). The front panel RS232 has a
fixed baud rate of 9600, a fixed data frame of 1 start, 8 data, and 1 stop bits with no parity.
The front port is for local use only and responds regardless of the slave address
programmed. This port may be connected to a personal computer running EnerVista 469
Setup. The software can download and upload settings files as well as upgrade the 469
firmware.
For RS485 communications, each 469 must have a unique address from 1 to 254. Address
0 is the broadcast address detected by all relays. Addresses do not have to be sequential
but no two units can have the same address or errors will occur. Generally, each unit
added to the link uses the next higher address starting at 1. Baud rates can be selected as
300, 1200, 2400, 4800, 9600, or 19200. The data frame is fixed at 1 start, 8 data, and 1 stop
bits, while parity is optional. The computer RS485 port is a general purpose port for
NOMINAL SYSTEM FREQUENCY
COMMUNICATIONS
SLAVE ADDRESS:
254
COMPUTER RS485
BAUD RATE: 9600
COMPUTER RS485
PARITY: None
AUXILIARY RS485
BAUD RATE: 9600
AUXILIARY RS485
PARITY: None
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
is "Variable".
Range: 1 to 254 in steps of 1
Range: 300, 1200, 2400, 4800, 9600,
19200
Range: None, Odd, Even
Range: 300, 1200, 2400, 4800, 9600,
19200
Range: None, Odd, Even
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