Eaton Power Xpert Meter 4000, Быстрый старт

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3.9. Hipot and Megohm (Megger) Testing
CAUTION
DO NOT HIPOT OR MEGOHM TEST THE METER. SEVERE DAMAGE TO THE METER
CAN RESULT.
3.10. Communication Wiring
The Power Xpert
®
Meter (PXM 4000/6000/8000) has inverted terminal blocks for CM4 -
the 24V Auxiliary I/O Power and CM6 - the Display Power. These inverted terminal blocks
prevent the user from crossing 24v source and communication terminals.
RS485 fail safe biasing resistors are used at each master port.
Eaton strongly recommends using ferrules when connecting to a terminal block.
When connecting to a terminal block, the twisted pair sensitivity is critical for COM0,
COM1 and COM2. This means that the Data A wire must match up with Data A on the
terminal and the Data B wire must match up with Data B on the terminal.
3.11. RS485 Network
The following simplified rules apply to a given system consisting of master and slave de-
vices. For more complex configurations please refer to standard wiring specification rules
for the RS485 network.
The maximum system capacity is 4,000 feet of communication cable and 32 devices.
Make sure the twisted pair wire is recommended for RS485 network use. For reference,
review the RS485 wiring spec for wiring specifications.
Tie the communication cable shield to ground only once at the RS485 master device.
Cable Specifications
Terminal Port Name Port
Type
Port
Connection
Cable Length Cable Type Max
Baud
Rate
Max
Number
of
Devices
End of Line
Termination
Star Tap Twisted Pair
Sensitivity
CM5
COM0 Dis-
play RS485
Terminal
Plug 2,000ft / 610 M
ShieldedTwisted-
Pair 115 K 16 120ohms NO NO YES
CM3 COM1RS485 RS485
Terminal
Plug
**4,000ft /
1,219.20 M
ShieldedTwisted-
Pair 115 K 32 120ohms NO NO YES
CE3 COM2RS485 RS485
Terminal
Plug
**4,000ft /
1,219.20 M
ShieldedTwisted-
Pair 115 K 32 120ohms NO NO YES
CE4 COM3RS232 RS232 DB9 50 ft / 15 M ShieldedCable 115 K 2(1:1) na NO NO YES
CE1 LAN/WAN 100Fx ST 400 M Multimode62.5 m 100M 2(1:1) na NO NO NO
CE2 LAN/WAN 10/100 T RJ45
328 - 492
ft/100-150M
CAT5 Shielded
TwistedPair / UTP* 100M 2(1:1) na NO NO NO
CM1
Local Con -
figuration 10/100 T RJ45 98 ft / 30 M
CAT5 Shielded
TwistedPair / UTP 100M 2(1:1) na NO NO NO
**RS485 maximum cable length is dictated by baud rate. Above 38.4Kbaud the length is restricted to 2,000 ft.
3.12. RS485 Network
The following simplified rules apply to a given system consisting of master and slave de-
vices. For more complex configurations please refer to standard wiring specification rules
for the RS485 network.
www.eaton.com
IB02601007E
Page 25
3 Mounting and Wiring