Crossover Guide
Unimotor fm E2/U2 to
Unimotor fm E3/U3
Class-leading servo motor performance
Application specics should be reviewed by an Emerson Application Engineer.
Unimotor fm Servo Motors - E2/U2 migration to E3/U3 models
INTRODUCTION
The Unimotor fm servo motor family has recently been redesigned to utilize Emerson Industrial Automation’s latest
manufacturing and component design improvements. This redesign provides improved performance in a shorter length
frame as compared to the previous design.
The following provides information to help identify these design improvements for those times when replacement of the
previous design is necessary. Note that there are 100% mechanical mounting replacements for any existing field installed
models. All previous order code information regarding bolt circle diameter, pilot diameter and shaft diameter are available
in the new design’s order string.
You will also see in the following information that there are higher performance specifications listed for most frames and
lengths. Electrical parameters like, Kt (torque constant) and Ke (voltage constant) remained the same for the new models.
This will allow for direct replacement into existing applications with no need to change motor parameters to maintain the
existing performance levels. Only instances where increased motor performance levels are desired would changes to drive
parameters be needed.
Unimotor fm E2/U2 Unimotor fm E3/U3
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The Unimotor fm E3/U3 servo motors also have
a raised EMERSON logo on the back cover.
Application specics should be reviewed by an Emerson Application Engineer.
Unimotor fm Servo Motors - E2/U2 migration to E3/U3 models
Crossover Reference Table
230 V E2 230 V E3
Stall Torque (Nm) Order Code Order Code Stall Torque (Nm)
2.2 075E2B400BACAA075110 075E3B400BACAA075110 2.7
4.3 095E2B300BACAA100190 095E3B300BACAA100190 4.5
4.3 095E2B400BACAA100190 095E3B400BACAA100190 4.5
7.5 095E2D300BACAA100190 095E3D300BACAA100190 7.9
7.5 095E2D400BACAA100190 095E3D400BACAA100190 7.9
9.4 115E2C300BACAA115190 115E3C300BACAA115190 10.8
12.4 115E2D300BACAA115240 115E3D300BACAA115240 13.7
15.3 115E2E300BACAA115240 115E3E300BACAA115240 23.4
460 V U2 460 V U3
2.2 075U2B300BACAA075140 075U3B300BACAA075140 2.7
2.2 075U2B400BACAA075140 075U3B400BACAA075140 2.7
3.9 075U2D300BACAA075140 075U3D300BACAA075140 4.7
4.3 095U2B300BACAA100190 095U3B300BACAA100190 4.5
4.3 095U2B400BACAA100190 095U3B400BACAA100190 4.5
7.5 095U2D300BACAA100190 095U3D300BACAA100190 7.9
9 095U2E400BACAA100190 095U3E400BACAA100190 9.3
6.6 115U2B300BACAA115190 115U3B300BACAA115190 7.4
9.4 115U2C300BACAA115190 115U3C300BACAA115190 10.8
12.4 115U2D300BACAA115190 115U3D300BACAA115190 13.7
15.3 115U2E300BACAA115190 115U3E300BACAA115190 16.0
15.3 142U2C300BACAA165240 142U3C300BACAA165240 15.7
19.8 142U2D300BACAA165240 142U3D300BACAA165240 20.5
23.4 142U2E300BACAA165240 142U3E300BACAA165240 25.0
41.1 190U2D300BACAA215320 *190U3D300BACAA215320-SREL 44.5
*The -SREL sufx indicates a shaft dimension length of 80 mm. For 58 mm shaft length exclude the sufx.
Order Code Summary
XXX X X X XX X X X XX X XXX XXX
Rated
Frame
Refer to the servo motor product literature for all available options.
size
Motor
voltage
Magnet
type
Stator
length
speed
(rpm x100)
Brake
(24 V)
Connection
type
Output
shaft
Feedback
device
Inertia +
Temperature
sensor PCD
Shaft Diameter
(mm)
Page 3
Application specics should be reviewed by an Emerson Application Engineer.
Unimotor fm Servo Motors - E2/U2 migration to E3/U3 models
Order Code Changes
Unimotor fm frame sizes 075 mm, 095 mm, 115 mm, 142 mm
Use the following information as a guide to cross an existing Unimotor fm E2/U2 order code to the new E3/U3 order codes.
For motor frames 075, 095, 115 and 142 the new E3/U3 model string can be created simply by replacing the 5th character
from the left from a “2” to a “3”.
For motor models provided with a holding brake, identified with a “1” in the 9th character, the new holding brake order
code is now “5”.
Here is an example of these order code changes:
All other order code positions would remain the same when ordering a replacement motor in these frames.
Unimotor fm frame size 190 mm
For the 190 frame motor the same applies as shown for the 075-142 models. In addition to these changes a “-SREL” suffix
is required to indicate the required shaft length. The standard shaft on all Unimotor fm 190 E3/U3 frame lengths is now
32 mm diameter by 58 mm long. When replacing an existing Unimotor fm 190 E2/U2 model use the suffix “-SREL” on the
order string to indicate the 32 mm diameter by 80 mm long shaft dimensions associated with the E2/U2 models.
Here is an example of this order code change:
All other order code positions would remain the same when ordering a replacement motor in these frames.
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Application specics should be reviewed by an Emerson Application Engineer.
Unimotor fm Servo Motors - E2/U2 migration to E3/U3 models
Motor Dimension Changes
With the new E3/U3 models the motor length decreases on some of the frames. Along with this shorter motor length also
comes a difference in the connector position relative to the motor faceplate. With the shorter motor the cable connectors
move closer to the motor faceplate.
Connector Position and Motor Length Differences
Unimotor E3/U3 Connector Position Difference from U2/E2 (mm) Motor Length Difference from E2/U2 (mm)
Frame Non-Brake Braked Non-Brake Braked
075A-D 0 -15 0 -15
095A-E 0 -15 0 -15
115A-E -8.2 -23.2 1.4 -13.6
142A-E -25 -10 -33.4 -18.4
190 A -28.6 -19.4 -38 -28.6
190B -25.5 -16.4 -34.9 -25.8
190C -22.7 -13.3 -31.9 -22.7
190D -19.4 -10.3 -28.8 -19.7
190E -16.4 -7.2 -25.8 -16.6
190F -13.3 -4.2 -22.7 -13.6
190G -10.3 -1.1 -19.7 -10.5
190H -7.2 1.9 -16.6 -7.5
Differences to Note:
• With the shorter motor the cable connectors move closer to the motor faceplate
• Along with this shorter motor length also comes a difference in the connector position relative to the motor faceplate
Connector Position
Unimotor fm E3/U3
Motor Length
Page 5
Application specics should be reviewed by an Emerson Application Engineer.
Unimotor fm Servo Motors - E2/U2 migration to E3/U3 models
Motor Parameters
Higher Torque ratings
The Cross Reference Table (page 3), shows in some cases that the stall torque of the E3/U3 models has increased. Although
this higher performance is available, it is not available to the application unless the servo drive has a sufficient current
rating and the appropriate drive parameters are set to the new motor data. Keep in mind that if the previous E2/U2 motor
was providing the required torque there is no need to change the existing drive settings, the new E3/U3 motor and existing
drive will provide the equivalent performance.
If the higher rating is needed use the motor name plate data to determine the information to enter for the new motor
parameters.
Use the following three steps to update the drives motor map information.
1. Use the appropriate commissioning software and update the motor information as indicated on the motor nameplate.
2. Verify that the motor feedback device settings in the drive match the motors feedback device.
3. Perform a rotating Autotune de-coupled from the load as described in the appropriate drive product literature.
4. Save the new drive parameters.
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