Wiring Diagrams - PXR Trip Units, Power Defense Frames 2, 3, 4, 5 & 6

Instructions Apply To:

The following diagrams and information are applicable to Power Defense Frames 2, 3, 4, 5, and 6.

⚠️ WARNING

• ONLY QUALIFIED ELECTRICAL PERSONNEL SHOULD BE PERMITTED TO WORK ON THE EQUIPMENT.
• ALWAYS DE-ENERGIZE PRIMARY AND SECONDARY CIRCUITS IF A CIRCUIT BREAKER CANNOT BE REMOVED TO A SAFE WORK LOCATION.
• DRAWOUT CIRCUIT BREAKERS SHOULD BE LEVERED (RACKED) OUT TO THE DISCONNECT POSITION.
• ALL CIRCUIT BREAKERS SHOULD BE SWITCHED TO THE OFF POSITION.

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; AND
• 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 EQUIPMENT.

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Wire Harness Pin-out and Color Code

This section details the pin-out and color coding for auxiliary power, sensor connections, configurable relays, form C auxiliary contacts, Modbus RTU communication, and maintenance mode interfaces for the PXR Trip Units. The primary component is the PXR Trip Unit, connected to various external features via specific terminals.

Note: Available wiring connections depend on optional features selected.

PD2 wires are 0.205 mm² (24 AWG) size, PD3, 4, 5, 6 wires are 0.326 mm² (22 AWG).

Wires are 0.75 meters (30 inches) long.

Control Power and Relay Wiring (Fig. 1)

This diagram illustrates the control power and relay wiring for the Power Defense MCCB. It shows a 24 VDC ± 10% power source connected to relays RLY1, RLY2, RLY3, and RLYC. The diagram includes a table detailing the color code, wire colors for PD 2, 3, 4 & 5, terminal assignments for PD6 Only, and the corresponding name for each connection.

Notes:

1. All relays can be mapped to different functions.
2. Factory default settings: RLY 1 = Remote Indicator/Maintenance Mode indication; RLY 2 = High Load alarm/Ground Fault alarm; RLY 3 = Trip.
3. Relay contact rating (resistive): PD2 = 0.3A@120/240Vac or 1A@30Vdc; PD3, 4, 5, 6 = 2A@120/240Vac or 2A@30Vdc.
4. The trip unit should be fed from a separate galvanically isolated +24 voltage DC supply.

Frame and Relay Kit Information:

External Neutral Sensing (Fig. 2)

This diagram illustrates the external neutral sensing configuration for the Power Defense MCCB. It shows an External Neutral Sensor connected to terminals 1 and 2, and a Voltage Sensor Module connected to terminals 3 and 4. These sensors are wired to the PXR unit via specific terminals (Gy, W, W/Gy) and the neutral bus (N).

Notes:

1. Sensor is customer wired to sense neutral currents. This is required for 3-phase, 4-wire residual ground fault (applicable for trip units having G protection).
2. See Instruction Leaflet IL012302EN.
3. Voltage sensor is customer wired to neutral bus.
4. See Instruction Leaflet IL012316EN.

Frame and Catalog Information:

Source Ground and Zero Sequence Sensing - PD 5 and 6 only (Fig. 3)

This diagram illustrates the Source Ground and Zero Sequence Sensing configuration, specifically for PD 5 and PD 6 units. It features a Ground Fault Secondary Transformer Module connected to an External Sensor and a Grounding Electrode. The module's outputs (J1, J2) are wired to the PXR unit via terminals D6 (SGS) and D7 (SGS) using Blue/Black and Blue/Yellow wires, respectively.

Notes:

1. External Sensor: For PD5 use 800:5, 1200:5 or 1600:5 sensor; For PD6 use 1200:5.
2. See Instruction Leaflet IL012309EN.

Zone Interlock Wiring (Fig. 4)

This diagram depicts the Zone Interlock Wiring system, which allows multiple Power Defense MCCBs (each containing a PXR unit) in different zones to coordinate. The system uses Zin, Zout, and Zcom terminals for inter-zone communication. The wiring is typically a twisted pair cable.

Notes:

1. Twisted pair (AWG #14 to #20) copper wire. Route the zone interlock wiring separate from power conductors. DO NOT GROUND any zone interlock wiring.
2. The maximum distance between two farthest breakers on different zones (from the Zout downstream to the Zin upstream terminals) is 250 feet (75 m).
3. A maximum of 20 loads (Zin, Zout) may be connected in parallel.
4. Provide a self-interlocking jumper (on zone 3), if coordination is desired with other downstream breakers not providing the Zone Interlock feature.

Maintenance Mode Wiring (Fig. 5)

This diagram illustrates the wiring for placing the PXR Trip Unit into Maintenance Mode. It shows connections for Control Voltage, configurable relays (RLYC, RLY1, RLY2, RLY3), and Maintenance Mode indicators (MM, MM (RTN)). An Enable Switch and Alternate Relay Contacts are also depicted. The system is part of the Power Defense MCCB.

Notes:

1. PXR20/25 can be placed in Maintenance Mode locally via the two-position switch on the front of the trip unit (models with Arc Flash Reduction Maintenance System™ - ARMS). A blue LED on the PXR also lights to indicate that the PXR is in Maintenance Mode.
2. A high-quality low-voltage switch with gold contacts is required. The recommended switch for this low-voltage application is Eaton part number L0250T133-2E, which includes a contact block rated for logic level and corrosive use. Alternately, use a general-purpose relay (IDEC RY22) with the appropriate coil voltage. In any application, wire length (AWG #20) should not exceed 15 feet.
3. On PXR models with on-board relays, a remote indicator can be connected to show that the PXR is in Maintenance Mode. Use one of the general-purpose relays.

Modbus RTU Wiring (Fig. 6)

This diagram illustrates the Modbus RTU communication wiring for the Power Defense MCCB. It shows the RTU_D(+), RTU_D(-), and RTU_GND terminals, along with a shield drain. The diagram depicts a daisy-chained network configuration, typical for Modbus RTU, and indicates the placement of a 120 Ohm termination resistor.

Notes:

1. Modbus communication cable is a twisted-pair with shield and "daisy-chained" between devices. Connect to other Modbus nodes, max. 99 nodes, max. length 1200 meters (4000ft.). Recommended Cable: twisted-pair foil shield w/drain wire, 120 ohms impedance, rated for the application (typical Belden 3105A or Belden 3074F).
2. The end devices in the daisy-chain should have a 120 Ohm resistor placed between RTU_D(+) and RTU_D(-).

PXR to ECAM or PCAM Wiring (Fig. 7)

This diagram shows the wiring for connecting the PXR Trip Unit to an ECAM or PCAM communication adapter. It details the connections for CMM G, CMM 1 through CMM 4 terminals, and the shield drain. The diagram illustrates a twisted-pair cabling scheme between the PXR and the CAM module, with a maximum distance limit.

Notes:

1. Use shielded twisted pair cable (2-pairs). Shield should be an aluminized Mylar with drain wire. Distance between PXR and CAM limited to 3m (10 ft.) maximum.
2. See Instruction Leaflet IL0131132EN (PXR-ECAM) and IL120009EN (PXR-PCAM) for detailed information including network connection details. Note that additional CAM modules will be available in the future.

Disclaimer of Warranties and Limitation of Liability

The information, recommendations, descriptions, and safety notations in this document are based on Eaton Corporation's ("Eaton") experience and judgment, and may not cover all contingencies. If further information is required, an Eaton sales office should be consulted.

Sale of the product shown in this literature is subject to the terms and conditions outlined in appropriate Eaton selling policies or other contractual agreement between Eaton and the purchaser.

THERE ARE NO UNDERSTANDINGS, AGREEMENTS, WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY, OTHER THAN THOSE SPECIFICALLY SET OUT IN ANY EXISTING CONTRACT BETWEEN THE PARTIES. ANY SUCH CONTRACT STATES THE ENTIRE OBLIGATION OF EATON. THE CONTENTS OF THIS DOCUMENT SHALL NOT BECOME PART OF OR MODIFY ANY CONTRACT BETWEEN THE PARTIES.

In no event will Eaton be responsible to the purchaser or user in contract, in tort (including negligence), strict liability, or otherwise for any special, indirect, incidental, or consequential damage or loss whatsoever, including but not limited to damage or loss of use of equipment, plant or power system, cost of capital, loss of power, additional expenses in the use of existing power facilities, or claims against the purchaser or user by its customers resulting from the use of the information, recommendations, and descriptions contained herein.

The information contained in this manual is subject to change without notice.

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© 2019 Eaton. All Rights Reserved. Printed in USA.

Publication No. TD012071EN
Part Number: TD012071ENH01
April 2019

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