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September 23, 2026 BY
IN Basler Electric

Basler Electric BE1-87T Three-Phase relays can provide zero-sequence filtering

Single-Phase

BE1-87T Single-Phase relays require phase angle compensation to be accomplished externally by proper

connection of the system CT secondaries. A wye/delta transformer requires that the CT secondaries be

connected in delta for the wye winding and in wye for the delta winding. This type of connection also

eliminates the zero-sequence component of current which could cause a false trip (operation) during

external ground fault conditions on the wye system.

Three-Phase

BE1-87T Three-Phase relays can provide zero-sequence filtering and compensation for phase shifts

introduced by the connections of the power transformer. This 30° Phase Shift compensation (either ±30°

or no compensation) is field selectable. Additionally, this feature allows sharing the transformer differential

relay CTs with other relays or instrumentation.

BE1-87T relays use the highest input current (in per unit values) to operate on maximum restraint. The

relay does not have a conventional operate winding in the internal magnetics. Operating current is

developed within the electronics of the relay.

Unrestrained Trip

Severe internal transformer faults may cause CT saturation. Under such circumstances, harmonic

restraint transformer differential relays may fail to trip because of the extremely high harmonic content in

the waveform. Lack of operation can result in severe transformer damage.

BE1-87T relays provide an independent unrestrained tripping function. When set above the possible

inrush current magnitude, this function provides high-speed protection for the most severe internal faults.
September 23, 2026 BY
IN Basler Electric

Basler Electric BE1-87T APPLICATION

APPLICATION

In general, power transformers have different values of current flowing through their primary, secondary,

and tertiary windings. These currents have specific phase relationships depending upon the connections

of the individual windings (e.g., wye/delta). As inputs to a differential relay, these currents must be

compensated or scaled so that the relay can compare the inputs and determine when an unbalance

exists. Under ideal operating conditions, the scaled vector sum of these currents is zero.

Because it is practically impossible to match the magnitudes of these detected currents from the various

power windings using standard CT ratios, the currents are matched within the relay by scaling each of the

applied currents by an appropriate factor called a Tap Setting. This is set by means of the front panel

INPUT dials. By selecting suitable tap ratios, the applied currents are scaled within the relay to achieve

the desired balance for normal operating conditions. BE1-87T relays offer a range of available tap settings

for inputs between 0.4 A to 1.78 A (Sensing Input Range Options 2 and 4 for a 1 A CT) or 2.0 to 8.9 A

(Sensing Input Range Options 1 and 3 for a 5 A CT). These settings are independently adjustable in

increments of 0.02 A for Sensing Input Range Options 2 and 4. or 0.1 A for Sensing Input Range Options

1 and 3. These small increments allow more precise scaling of the applied currents and usually eliminate

the need for installing auxiliary ratio-matching CTs.
September 23, 2026 BY
IN Aerotech

Aerotech Automation1 XI4 Feedback Features

Feedback Features

Each axis on the XI4 includes encoder feedback inputs so that you can

control axis position very accurately. This input accepts incremental

square-wave and absolute (optional) feedback devices.

The dedicated axis feedback signals include encoder feedback

(sine +/-, cosine +/- & marker inputs), 2x end of travel (EOT) limit switch

inputs and amplifier enable and fault I/O. A dedicated digital I/O port

supports 8 digital inputs, 8 digital outputs (sourcing or sinking),

1 differential high-speed input and a dedicated high-speed PSO output.

Platform Power

More than just hardware, the XI4 gives you access to the complete power

of the Automation1 motion control platform. This includes the Automation1

motion development kit (MDK), the intelligent software-based controller

(iSMC) and the powerful AeroScript™ programming language with

integrated RS-274 G and M code support. The Automation1 iSMC can also

be programmed by various controller APIs, which provide flexible methods

of integrating the XI4 and the axes it controls into your system architecture.
September 23, 2026 BY
IN Basler Electric

Basler Electric BE1-87T Transformer Differential Relays

DESCRIPTION

BE1-87T Transformer Differential Relays provide primary protection for power transformers and are

available in either Single-Phase or Three-Phase configurations. The solid-state BE1-87T compares the

currents entering and leaving the protected transformer. If a fault is detected, the relay initiates a trip

signal to isolate the power transformer. This limits damage to the transformer and minimizes the impact

on the power system.

BE1-87T relays use three types of restraint:

• Percentage of through-current

• Second harmonic

• Fifth harmonic

Selectivity in differential relaying is based on the ability to distinguish between internal and external faults.

This is achieved by comparing the currents into and out of a power transformer. Comparing these

currents often requires more than two inputs. For example:

• Power transformers may have a significant portion (greater than 10 %) of the current flowing in a

third or tertiary winding.

• Power transformers can have multiple breakers for a given winding (e.g., ring bus or breaker

and-a-half bus).

BE1-87T relays are available with up to five restraint inputs for the single-phase unit and up to three

restraint inputs per phase for the three-phase unit.
September 23, 2026 BY
IN Aerotech

Aerotech Automation1 iXI4 KEY FEATURES

Automation1

The iXI4 is a part of the user-friendly Automation1 motion control

platform, which includes the following:

• Development Software

• Controls

• Motor Drives

• Fiber-Optic HyperWire® Communication Busi

KEY FEATURES:

• Unlocks the full MOTION CONTROL power of our Automation1

-iSMC intelligent software based motion controller

• Features COMPLETE CONFIGURATION &PERFORMANCE

capability of the XI4 servo controller

• CONNECT TO THE CONTROLLER using Modbus TCP/IP or

TCP Socket interface

• Enables up to 12 AXES OF CONTROL when more Automation1

drives are connected over the HyperWire fiber-optic bus

• Includes up to four SINGLE CONNECTOR axis interface connectors

• Features up to four axes of 20 kHz CLOSED LOOP SERVO control
September 23, 2026 BY
IN Aerotech

Aerotech Automation1 XI4 Complete Your Machine Control

KEY FEATURES:

• Supports SINGLE CONNECTOR axis interface including analog control

output, encoder feedback, 2x EOT limit inputs, marker input, amplifier

enable & fault, plus optional absolute encoder support

• Features up to 4 axes of 20 kHz CLOSED LOOP SERVO control

• Features one ANALOG CURRENT COMMAND per axis

• Includes ONE-AXIS PSO standard with multi-axis options

• Include 8/8 DIGITAL I/O (optically isolated), 1x high speed input &

dedicated PSO output

Complete Your Machine Control

Because the XI4 connects over Automation1’s HyperWire® network,

the axes it controls can be coordinated with other axes on the network

to deliver contoured motion and a single, simple machine control

architecture.
September 23, 2026 BY
IN Aerotech

Aerotech Automation1 XI4 Servo Controller

Control Any Amplifier

The Automation1 XI4 servo controller brings precision

Automation1 servo control to any analog transconductance

amplifier. Each XI4 axis of control generates an analog voltage

command — required by analog amplifiers to control the

output current to a servo motor — and receives encoder and

axis feedback signals. The XI4 comes in both 2- and 4- axis

configurations, each with an independent 20 kHz servo control

loop. For added flexibility, each axis on the XI4 can be configured

to output clock and direction control signals.

Automation1

The XI4 is a part of the user-friendly Automation1 motion control

platform, which includes the following:

• Development Software

• Controls

• Motor Drives

• Fiber-Optic HyperWire® Communication Bus
September 23, 2026 BY
IN Aerotech

Aerotech Automation1 iXI4 Phenomenal Control Power

Phenomenal Control Power

Take full control of your machine or motion system with the

Automation1-iXI4 motion and servo controller. The iXI4 can run

the complete Automation1-iSMC motion controller and control up

to four analog transconductance amplifiers or clock and direction

devices. Each axis of control includes encoder and axis feedback

signals and an independent 20 kHz servo control loop.

The iXI4 connects to other Automation1 drives over HyperWire

and connects to other automation devices over EtherCAT,

EtherNet/IPTM, Modbus TCP/IP or a TCP Socket interface. Multi

axis PSO enables precision control of your industrial laser or

process tool synchronized with your motion trajectory.

Automation1

The iXI4 is a part of the user-friendly Automation1 motion control

platform, which includes the following:

• Development Software

• Controls

• Motor Drives

• Fiber-Optic HyperWire® Communication Busi
September 23, 2026 BY
IN Aerotech

Aerotech Servo Motor Drives Automation1 XC6e

Ultra-Smooth, Precise Motion for

High-Power Applications

The Automation1 XC6e single-axis PWM servo motor drive brings

precision motion control to your high-power applications. It offers

all the benefits of our XC4e drive but with more power to move the

largest payloads, so you’ll accelerate large, brushless servo motors

faster and reach higher top speeds without sacrificing smooth

motion. Plus, the XC6e can be configured and programmed

with Automation1’s user-friendly Studio application and APIs.

Compatible with brush, brushless, voice coil or stepper motors,

the XC6e also easily controls servo, galvo and piezo motors.
September 23, 2026 BY
IN Aerotech

Aerotech Automation1 XC6e KEY FEATURES

Automation1

The XC6e is a part of the user-friendly Automation1 motion

control platform, which includes the following:

• Development Software

• Controls

• Motor Drives

• Fiber-Optic HyperWire® Communication Bus

KEY FEATURES:

• Connects through the HyperWire® fiber-optic bus, which has

20 TIMES THE BANDWIDTH of 100BASE-T Ethernet buses

• Provides UP TO 100 AMPS peak output

• Offers 240 VAC and 480 VAC voltage options

• Includes SAFE TORQUE OFF (STO) safety circuit

• Features drive array with MORE THAN 67 MB of memory

• Holds CE approval; follows the EU 2015/863 RoHS 3 directive.

Pending NRTL safety certification

• Offers many optional features, including Multi axis Position

Synchronized Output (PSO), I/O expansion board, and 65K

encoder multiplier

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