IL01301034-ED-IZMX-MODBUS.pdf

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Effective December 2010
Supersedes March 2010
IL01301034EH02
Instructional Lealet IL01301034E
Installation instructions for Series NRX
Modbus communications adapter
module (MCAM)
Instructions apply to:
Series NRX, Type NF Frame
ANSI, UL1066, UL489/IEC IZMX16, IZM91
Series NRX, Type RF Frame
IEC, IZMX40
Section 1: General information
The Series NRXE ModbusT communications adapter mod-
ule (MCAM) ( Figure 1 ) is an accessory that will operate as
a communicating device in conjunction with a compatible
Series NRX trip unit/breaker in a master communications
network ( Figure 2 ).
The Modbus adapter communicates to a master on a
Modbus network using the Modbus RTU (remote terminal
unit) protocol. Information is exchanged through the MCAM
between the Modbus master and the Digitrip unit using
assigned registers.
WARNING
(1) ONLY QUALIFIED ELECTRICAL PERSONNEL SHOULD BE
PERMITTED TO WORK ON THE EQUIPMENT.
(2) ALWAYS DE-ENERGIZE PRIMARY AND SECONDARY CIRCUITS
IF A CIRCUIT BREAKER CANNOT BE REMOVED TO A SAFE WORK
LOCATION.
(3) DRAWOUT CIRCUIT BREAKERS SHOULD BE LEVERED (RACKED)
OUT TO THE DISCONNECT POSITION.
(4) ALL CIRCUIT BREAKERS SHOULD BE SWITCHED TO THE OFF
POSITION AND MECHANISM SPRINGS DISCHARGED. FAILURE TO
FOLLOW THESE STEPS FOR ALL PROCEDURES DESCRIBED IN THIS
INSTRUCTION LEAFLET COULD RESULT IN DEATH, BODILY INJURY,
OR PROPERTY DAMAGE.
WARNING
THE INSTRUCTIONS CONTAINED IN THIS IL AND ON PRODUCT
LABELS HAVE TO BE FOLLOWED. OBSERVE THE FIVE SAFETY RULES:
– DISCONNECTING
– ENSURE THAT DEVICES CANNOT BE
ACCIDENTALLY RESTARTED
– VERIFY ISOLATION FROM THE SUPPLY
– EARTHING AND SHORT-CIRCUITING
– COVERING OR PROVIDING BARRIERS TO
ADJACENT LIVE PARTS
DISCONNECT THE EQUIPMENT FROM THE SUPPLY. USE ONLY
AUTHORIZED SPARE PARTS IN THE REPAIR OF THE EQUIPMENT.
THE SPECIFIED MAINTENANCE INTERVALS AS WELL AS THE
INSTRUCTIONS FOR REPAIR AND EXCHANGE MUST BE STRICTLY
ADHERED TO PREVENT INJURY TO PERSONNEL AND DAMAGE TO
THE SWITCHBOARD.
Figure 1. Series NRX Modbus Communications Adapter
Module
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Instructional Lealet IL01301034E
Effective December 2010
ed circuit breakers, a separate DIN rail mounting configura-
tion is preferred. Consult the customer support center for
additional information.
The following tools should be available:
• #T-15 Torx
• Small flat blade screwdriver
Master
Device
Communications
Network
MCAM
Module
1
MCAM
Module
2
MCAM
Module
3
For drawout circuit breakers, secondary terminal blocks as
well as the Modbus communications adapter module are
DIN rail mounted on the top front portion of the drawout
cassette. The module is designed to install or replace the
four terminal blocks (eight contacts in total) at secondary
contacts 19–26. Refer to the master connection diagram
that can be found in the breaker instruction manual. For
additional information relative to secondary terminal block
installation and/or removal beyond that which is presented
in this section, refer to IL01301037E.
Proceed with the following seven steps:
Step 1: Using a T-15 Torx, remove the four mounting
screws holding the terminal block alignment bracket in
place.
Series
NRX
Breaker
Series
NRX
Breaker
Series
NRX
Breaker
Figure 2. Modbus Communications Adapter Modules in a
Modbus Network
The Modbus communications adapter module is a slave
device and as such requires a master device for control
command initiation. Each Modbus communications adapter
module provides:
• Circuit breaker open/close/reset control
• NRX trip unit source/residual ground selection (if
applicable)
• Flashing Status LED indicating module has power
• Modbus communication enable/disable selection jumper
for remote open/close control
• DIN rail mounting (11 mm H, 28 mm W DIN rail minimum
requirement)
Figure 3. Step 1
Input power for module from 24 Vdc
•
Step 2: Carefully slide the alignment bracket out from
between any mounted terminal blocks and put it aside with
its mounting hardware for re-installment after the communi-
cations adapter module is connected to the DIN rail.
The Modbus communications adapter module is designed
to be installed, operated, and maintained by adequately
trained people. These instructions do not cover all details or
variations of the equipment for its storage, delivery, installa-
tion, checkout, safe operation, or maintenance.
If you have any questions or need additional information or
instructions, please contact your local Eaton representative
or visit www.eaton.com.
Section 2: Installation of Modbus commu-
nications adapter module
The following steps outline the installation procedure for a
Series NRX Modbus communications adapter module in a
drawout circuit breaker configuration only. For fixed-mount-
Figure 4. Step 2
2
EATON CORPORATION www.eaton.com
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Effective December 2010
Instructional Lealet IL01301034E
Step 3: Remove the terminal block in location 19/20 by
inserting a small screwdriver in the recessed area in the top
front of the terminal block as shown, and gently pry down
to release and remove the block from the DIN rail.
Step 6: Carefully slide the terminal block alignment bracket
back into position. Before securing the bracket in place,
inspect it from the bottom to ensure that the teeth on
the bracket separate each individual terminal block.
One installed terminal block only should be visible
between two teeth when the alignment bracket is
properly positioned. Secure the terminal block alignment
bracket using the four screws previously removed. Hand
tighten the four mounting screws.
Figure 5. Step 3
Step 4: Repeat the same procedure performed in Step 3
to remove terminal blocks at locations 21/22, 23/24, and
25/26.
oteN The extra DIN rail mounting screw located in the space where
the four terminal blocks were mounted may need to be removed to
allow the unit’s pogo pin ground to properly hit the metal DIN rail.
Figure 8. Step 6
Step 7: A mounted communications module appears as
shown and the installation procedure is complete. The
module can now be wired in keeping with the information
presented in Section 3.
Mounting Screw
Figure 6. Step 4
Step 5: Tilt the communications module forward to engage
the upper part of the DIN rail, and then snap it back into the
DIN rail for complete engagement.
Figure 9. Step 7
Figure 7. Step 5
3
EATON CORPORATION www.eaton.com
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Instructional Lealet IL01301034E
Effective December 2010
Section 3: Basic Modbus RS-485 Network
Wiring
The following simplified rules apply to a given system con-
sisting of a cable link between master and slave devices
( Figure 2 ). For more complex considerations, please refer
to standard Modbus RTU wiring specification rules for the
RS-485 network.
Table 2. Modbus Connector Pin-Outs ab
1 RS-485 Network-B (non-inverting)
2 RS-485 Network-A (inverting)
3 Common
4 Shield
a This 4-pin connector provides the interface to the
Modbus network.
b Connect shield wire to ground at master device end only. Interconnect shielding where devices
are daisy-chained.
1. The recommended Modbus cable has twisted-pair wires
(24 AWG stranded 7 x 32 conductors with PVC insula-
tion) having an aluminum/mylar foil shield with drain
wire.
2. The maximum system capacity is 4,000 feet of com-
munications cable and 247 devices on the Modbus RTU
network.
3. Make sure there is twisted-pair wire that is recommend-
ed for Modbus RTU network use. Use shielded twisted-
pair wire to connect each slave to the Modbus RTU net-
work, daisy-chain style. The polarity of the twisted pair
is CRITICALLY important.
Section 5: Jumpers and indicator LEDS
Refer to Figure 10 to become familiar with specific jumper
and LED locations on the Modbus communications adapter
module.
Section 4: Modbus communications adapt-
er module connections
WARNING
ALL APPLICABLE SAFETY CODES, SAFETY STANDARDS, AND
SAFETY REGULATIONS MUST BE STRICTLY ADHERED TO WHEN
INSTALLING, OPERATING, OR MAINTAINING THIS EQUIPMENT.
FAILURE TO COMPLY COULD RESULT IN DEATH, BODILY INJURY,
OR PROPERTY DAMAGE.
LEDs
Jumper
Plug for
Source
Sensing
For installation specifics, refer to Figure 3 and Figure 4 on
page and page respectively for wiring diagrams, as well as
pin-out Table 1 (power connections) and Table 2 (Modbus
connections).
Jumper Plugs for
Communicaton Control
Figure 10. Modbus Communications Adapter Module
(Front View Closeup)
Table 1. Power Connector Pin-Outs a
Pin Number
Input Signal
Pin Number
Input Signal
MicroController LED (Status)
This indicator will be flashing green whenever the module
is powered up and when the microprocessor is executing
instructions. When the Series NRX Modbus communica-
tions adapter module is connected to a Series NRX trip
unit for the first time, this LED will alternately flash red and
green to signal a learning process between both units. This
automatic process will take approximately 15 seconds and
occurs only once during the initial startup. The LED will also
flash red if the module is not connected to or unable to
communicate with a Series Digitrip unit.
1 24 Vdc +
2 24 Vdc –
3 Control signal common
4 Control open signal
5 Control close signal
a Module power uses a 5-pin input connector. Power requirement is 24 Vdc, 10 watts.
4
EATON CORPORATION www.eaton.com
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Effective December 2010
Instructional Lealet IL01301034E
Modbus RS-485 network Tx LED (Transmit)
This LED will be lit whenever the
module is transmitting on the Modbus RTU network.
remote Open and Close Breaker commands can be acted
upon. With the jumper in the DISABLE position, these com-
mands will not be accepted.
Source/residual ground selection jumper
This jumper selects the protection configuration for Digitrip
units with ground fault protection or ground fault alarm
functionality. Consult Series NRX trip unit instructions (IL
01301051E for Digitrip 520) for further information on
ground sensing. This jumper is not applicable and does not
function for non-ground fault style trip units.
Modbus RS-485 network Rx LED (Receive)
This LED will be lit whenever the module is receiving from
the Modbus RTU network.
Modbus control jumper
This jumper provides the user with a means of enabling or
disabling remote communication control commands to the
Digitrip unit. With jumper placed in the ENABLE position,
121 Ohms
a The Series NRX communications module is a separate device that snaps into the DIN rail starting at location 19–26. (Removal of the four contact blocks
is required.)
b The trip unit auxiliary voltage is 24 Vdc ±10% and should be sourced from a reliable service.
c Ground the shield at the master device and refer to Section 3 on page 4.
d Set the jumper on the module to enable or disable the remote open and close communication control commands, as desired.
e When the communications module is employed and source ground or zero sequence ground sensing method is required, the ground fault function is
enabled by this jumper.
f Connectors are ULT/CSAT rated 300V, VDE rated 250V. Recommended: Weidmuller (BL 3.5/90/5BK) Orientation: 90° lead exit, but other lead orientations
are possible. Wire guage: #18 AWG/0.82 mm.
g The final device in the daisy-chain configuration must have a 121 ohms termination resistor installed across terminals #1 and #2 on TB #2.
Figure 11. Series NRX Modbus Communication with Digitrip 520M
5
EATON CORPORATION www.eaton.com
 
 
 
 
 
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