GE Grid Solutions Multilin 9450 - Steps to Determine Power Needed

5–10 EPM 9450/9650 ADVANCED POWER QUALITY METERING SYSTEM – INSTRUCTION MANUAL
COMMUNICATION PORTS ON THE EPM I/O MODULES CHAPTER 5: COMMUNICATION WIRING
• Insert the other end of the cable into the I/O module’s female RS485 side port (see
Figure 5.8). The connectors fit only one way into the ports.
• Use the male RS485 side port to attach another I/O module. The EPM 9450/9650
meter can power up to four connected I/O modules using 15–20V DC at 50–
200mA. Use the steps in Section 5.6.2 to determine if you must use a separate
power source (for example, GE’s PSIO) to supply added power to the group. See
Section 9.2.1 for information on the PSIO. RS485 communication is viable for up to
4000 feet (1219 meters). However, if your cable length exceeds 200 feet, use the
remote power supply and:
1. Connect the + and - terminals on the EPM meter to the + and - terminals of the
female RS485 port. Connect the shield to the shield (S) terminal. The (S)
terminal on the EPM meter is used to reference the meter’s port to the same
potential as the source. It is not an earth-ground connection. You must also
connect the shield to earth-ground at one point.
2. Provide termination resistors at each end, connected to the + and - lines. RT is
approximately 120 Ohms. See RT EXPLANATION in Section 5.3
5.6.2 Steps to Determine Power Needed
Available power for all ports of the EPM 9450/9650 meter is 12 VA.
1. Refer to the tables on the next two pages to determine the VA Ratings for I/O
modules and displays.
2. Add together the VA Ratings for all I/O modules and displays in use.
3. Compare available power to power needed to determine if you must use an
additional power source.
NOTE
Note
GE recommends the PSIO 12V power source if the I/O module VA rating exceeds the EPM
specification. See Section 9.2.1 for information and Section 9.3 for usage instructions.
I/O Module Factory Settings and VA Ratings
Model# Module Address VA Rating
1mAON4 ±0-1mA, 4 Analog Outputs 128 2.7VA
1mAON8 ±0-1mA, 8 Analog Outputs 128 3.2VA
20mAON4 4-20mA, 4 Analog Outputs 132 5.0VA
20mAON8 4-20mA, 8 Analog Outputs 132 8.5VA
8AI1 ±0-1mA, 8 Analog Inputs 136 2.3VA
8AI2 4-20mA, 8 Analog Inputs 140 2.3VA
8AI3 0-5VDC, 8 Analog Inputs 144 2.3VA
8AI4 0-10VDC, 8 Analog Inputs 148 2.3VA
4RO1 4 Latching Relay Outputs 156 2.7VA
4PO1 4 KYZ Pulse Outputs 160 2.7VA
8DI1 8 Status Inputs (Wet/Dry) 164 1.0VA