Iron Horse MTGR right-angle shaft User manual
IronHorse® MTG DC Gearmotors
Page aIronHorse®DC Gearmotors User Manual – 1st Edition, Rev. B – 05/16/2018
®
IronHorse® DC Gearmotors User Manual
User Manual Number: IH-MTG-DC_UMW
Page b IronHorse®DC Gearmotors User Manual – 1st Edition, Rev. B – 05/16/2018
IronHorse® MTG DC Gearmotors
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Page iIronHorse®DC Gearmotors User Manual – 1st Edition, Rev. B – 05/16/2018
IronHorse® DC Gearmotors User Manual
Table of ConTenTs
Revision History of This User Manual � � � � � � � � � � � � � � � � � � � � ii
~ WARNING ~ � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 1
Trademarks � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 1
Manual Overview � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 2
Overview of this Publication � � � � � � � � � � � � � � � � � � � � � � � � � � 2
Who Should Read This Manual � � � � � � � � � � � � � � � � � � � � � � � � � 2
Technical Support � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 2
Special Symbols � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 2
Purpose of Gearmotors � � � � � � � � � � � � � � � � � � � � � � � � � � 2
Receiving and Inspection� � � � � � � � � � � � � � � � � � � � � � � � � � 3
Unpacking� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 3
Available Models � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 3
IronHorse Gearmotors Part Number Information� � � � � � � � � � � � � � � 3
Nameplate Information � � � � � � � � � � � � � � � � � � � � � � � � � � 3
IronHorse MTG Gearmotor Specifications � � � � � � � � � � � � � � � � � � 4
General Specifications and Features for all MTG Gearmotors � � � � � � � � � � � 4
MTGP Parallel Shaft Gearmotors Specifications� � � � � � � � � � � � � � � � � � 4
MTGR Right-Angle Shaft Gearmotors Specifications � � � � � � � � � � � � � � � 5
IronHorse MTG Gearmotor Dimensions � � � � � � � � � � � � � � � � � � � 6
MTGP Parallel Shaft Gearmotors Dimensions� � � � � � � � � � � � � � � � � � � 6
MTGR Right-Angle Shaft Gearmotors Dimensions � � � � � � � � � � � � � � � � 7
Motor Mounting � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 8
Proper Installation Conditions� � � � � � � � � � � � � � � � � � � � � � � � � � 8
Coupling Alignment � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 8
Terminal Diagram and Wiring � � � � � � � � � � � � � � � � � � � � � � � 8
Accessories � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 9
Replacement DC Gearmotor Brushes � � � � � � � � � � � � � � � � � � � � � � 9
Spare Parts Kit � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 9
Replacing Brushes � � � � � � � � � � � � � � � � � � � � � � � � � � � � �10
Routine Maintenance � � � � � � � � � � � � � � � � � � � � � � � � � � �10
Troubleshooting � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �11
Page iiIronHorse®DC Gearmotors User Manual – 1st Edition, Rev. B – 05/16/2018
IronHorse® DC Gearmotors User Manual
Revision History of This User Manual
Please include the Manual Number and the Manual Issue, both shown below, when communicating with
Technical Support regarding this publication.
Manual Number: IH-MTG-DC_UMW
Issue: First Edition, Revision B
Issue Date: 05/16/2018
Revision History
Issue Date Description of Changes
First Edition 03/04/2014 Original Issue
1st Ed, Rev A 11/17/2017 Added resistance and inductance values. Added axial load (thrust) ratings.
1st Ed, Rev B 05/16/2018 Mounting information; Right-angle dual-shaft dimensions
IronHorse® MTG DC Gearmotors
Page 1IronHorse®DC Gearmotors User Manual – 1st Edition, Rev. B – 05/16/2018
~ WARNING ~
Thank you for purchasing automation equipment from Automationdirect.com®, doing business as
AutomationDirect. We want your new automation equipment to operate safely. Anyone who installs or
uses this equipment should read this publication (and any other relevant publications) before installing or
operating the equipment.
To minimize the risk of potential safety problems, you should follow all applicable local and national
codes that regulate the installation and operation of your equipment. These codes vary from area to area
and usually change with time. It is your responsibility to determine which codes should be followed, and
to verify that the equipment, installation, and operation is in compliance with the latest revision of these
codes.
At a minimum, you should follow all applicable sections of the National Fire Code, National Electrical
Code, and the codes of the National Electrical Manufacturer’s Association (NEMA). There may be local
regulatory or government offices that can also help determine which codes and standards are necessary
for safe installation and operation.
Equipment damage or serious injury to personnel can result from the failure to follow all applicable
codes and standards. We do not guarantee the products described in this publication are suitable for
your particular application, nor do we assume any responsibility for your product design, installation, or
operation.
Our products are not fault-tolerant and are not designed, manufactured or intended for use or resale as
on-line control equipment in hazardous environments requiring fail-safe performance, such as in the
operation of nuclear facilities, aircraft navigation or communication systems, air traffic control, direct life
support machines, or weapons systems, in which the failure of the product could lead directly to death,
personal injury, or severe physical or environmental damage (“High Risk Activities”). AutomationDirect
specifically disclaims any expressed or implied warranty of fitness for High Risk Activities.
For additional warranty and safety information, see the Terms and Conditions section of our catalog.
If you have any questions concerning the installation or operation of this equipment, or if you need
additional information, please call us at 770-844-4200.
This publication is based on information that was available at the time it was printed. At
AutomationDirect we constantly strive to improve our products and services, so we reserve the right to
make changes to the products and/or publications at any time without notice and without any obligation.
This publication may also discuss features that may not be available in certain revisions of the product.
Trademarks
This publication may contain references to products produced and/or offered by other companies. The
product and company names may be trademarked and are the sole property of their respective owners.
AutomationDirect disclaims any proprietary interest in the marks and names of others.
Copyright © 2014, 2017, 2018 Automationdirect.com®Incorporated
All Rights Reserved
No part of this manual shall be copied, reproduced, or transmitted in any way without the prior, written
consent of Automationdirect.com®Incorporated. AutomationDirect retains the exclusive rights to all
information included in this document.
Page 2 IronHorse®DC Gearmotors User Manual – 1st Edition, Rev. B – 05/16/2018
IronHorse® MTG DC Gearmotors
Manual Overview
The IronHorse®series MTG DC Gearmotors User Manual describes the installation, maintenance
and use of all IronHorse series MTG DC Gearmotors.
This manual contains important information for those who will install, maintain, use and/or resell
any of the IronHorse MTG DC Gearmotors.
By Telephone: 770-844-4200
(Mon.-Fri., 9:00 a.m.-6:00 p.m. E.T.)
On the Web: support.automationdirect.com
Our technical support group is glad to work with you in answering your questions. If you cannot
find the solution to your particular application, or, if for any reason you need additional technical
assistance, please call technical support at 770-844-4200. We are available weekdays from 9:00
a.m. to 6:00 p.m. Eastern Time.
We also encourage you to visit our web site where you can find technical and non-technical
information about our products and our company. Visit us at www.automationdirect.com.
When you see the “notepad” icon in the left-hand margin, the paragraph
to its immediate right will be a special note.
When you see the “exclamation mark” icon in the left-hand margin, the paragraph to
its immediate right Will be aWarning. this information could prevent injury, loss of
property, or even death (in extreme cases).
Purpose of Gearmotors
Gearboxes are mechanical drive components that can be installed between a motor and a load
to drive the load at a reduced fixed ratio of the motor speed. The output torque is also increased
by the same ratio, while the horsepower remains the same (less efficiency losses). A 10:1 ratio
gearbox outputs approximately the same motor output horsepower, but motor speed is divided by
10, and motor torque is multiplied by 10. Gearmotors combine both the motor and the gearbox in
one single component.
We offer parallel gearmotors with the gearbox output shaft in the same direction as the motor
shaft, and right-angle gearmotors with the gearbox output shaft at a 90° angle to the motor shaft.
IronHorse DC gearmotors are manufactured in the U.S.A. by a leading motor supplier with
over 65 years experience delivering high-quality motors and gearmotors to the demanding U.S.
market. Our supplier does 100% dynamic testing of the gearmotors before shipment.
IronHorse DC gearmotors are designed for use on unfiltered SCR (Thyristor) type rectified AC
input. They may also be used with PWM (pulse width modulated) type DC adjustable speed
drives, and in across-the-line applications.
IronHorse® MTG DC Gearmotors
Page 3IronHorse®DC Gearmotors User Manual – 1st Edition, Rev. B – 05/16/2018
Receiving and Inspection
After receiving an IronHorse gearmotor, please check for the following:
• Open the motor packaging and inspect for damage during shipment.
• Make sure the part number indicated on the motor nameplate corresponds with the part
number on your order.
Available Models
• MTGP parallel shaft gearmotors
• MTGR right-angle shaft gearmotors
IronHorse Gearmotors Part Number Information
Nominal RPM
Three digits representing nominal rpm
Voltage Class (multiple letters possible)
J: 12 VDC
K: 24 VDC
L: 90 VDC
IronHorse Gearmotors Series Designation
Rated Horsepower / Accessory Type
P: Decimal point
# left of P: Rated full hp
# right of P: Rated fractional hp (expressed as decimal)
K: Replacement parts kit
Phase
1: Single phase
Gear Type
A: Accessory
P: Parallel
R: Right angle
Optional Identifier
1: Accessory kit for gearmotors
MTG P - P20 - 1 J 026
Nameplate Information
Page 4 IronHorse®DC Gearmotors User Manual – 1st Edition, Rev. B – 05/16/2018
IronHorse® MTG DC Gearmotors
IronHorse MTG Gearmotor Specifications
• TENV enclosure
• IP40 environmental rating
• Class F insulation
• SCR rated
• Externally replaceable brushes
• Double-shielded bearings
• Permanently lubricated
• Dynamically balanced armature
• Reversible design
• Can be mounted in any orientation
• Not intended for DC power generation
• UL recognized (E365956), CSA certied
(259724), RoHS compliant
Gearmotor Specifications – MTGP Series Parallel Shaft Gearmotors
Voltage (VDC)
Gear
(ohms)
(mH)
Dia
(in)
(lb)
Weight (lb)
Dimension Draning #
12 1/16
7.9 386:1 50 1.39
0.372 0.804
0.3125 50 None 4.0
Grease
lubrication**
Sleeve
bearings
18-inch
wiring leads
Face
mounted
P-A
24 120:1 50 2.41
34 83:1 45 2.86
50 55:1 45 3.88
97 26:1 36 5.68
90 1/17
8.4 386:1 50 0.19
17.0 41.0
12 269:1 50 0.23
37 83:1 45 0.40
55 55:1 45 0.54
114 26:1 26 0.61
90 1/7
26 69:1 280 1.58
5.17 0.041
0.625 150 200 11.4
Oil
lubrication**
Needle
bearings
Junction box
with 8-inch
wiring leads
Face or foot
mounted
Designed
to AGMA
standards
P-B
39 46:1 189 1.59
61 30:1 130 1.59
91 20:1 86 1.58
165 11:1 47 1.57
12 1/5
26 69:1 280 12.60
0.101 0.472
37 46:1 245 15.80
56 30:1 168 15.70
84 20:1 112 15.70
154 11:1 61 15.60
24 1/5
18 110:1 280 4.41
0.405 1.89
36 46:1 245 7.89
84 20:1 112 7.87
153 11:1 61 7.81
* Current must be limited so that it does not exceed 125% of the gearmotor rated current.
** Permanently lubricated.
NOTE: Replacement parts are available; refer to the “Accessories” section of this user manual.
IronHorse® MTG DC Gearmotors
Page 5IronHorse®DC Gearmotors User Manual – 1st Edition, Rev. B – 05/16/2018
Gearmotor Specifications – MTGR Series Right-Angle Shaft Gearmotors
Voltage (VDC)
Gear
Weight (lb)
Dimension Drawing #
90 1/19
38 50.0:1 42 0.68
17.0 66.4
single
shaft
0.5 in
dia
200 150 8.3
Grease
lubrication**
Ball bearings
Junction box
with 8-inch
wiring leads
Foot or face
mounted
Single worm
R-A
53 36.0:1 33 0.68
93 20.5:1 23 0.68
132 14.5:1 17 0.67
197 9.75:1 12 0.68
12 1/15
36 50:1 50 5.69
0.284 1.20
84 20.5:1 34 6.78
177 9.75:1 18 6.78
90 1/7
22 82:1 280 1.41
4.73 25.4
dual
shaft
0.625
in dia
150 200 14.4
Double shielded
ball bearings
Junction box
with 8-inch
wiring leads
Foot mounted
Bevel gears
80 – 90%
efficient
Can be
backdriven***
R-B
40 44:1 185 1.64
64 28:1 116 1.65
77 23:1 97 1.65
178 10:1 44 1.64
24 1/5
23 82:1 280 5.64
0.294 1.59
39 44:1 263 8.74
75 23:1 137 8.72
174 10:1 63 8.75
* Current must be limited so that it does not exceed 125% of the gearmotor rated current.
** Permanently lubricated.
*** Not intended for DC power generation.
NOTE: Replacement parts are available; refer to the “Accessories” section of this user manual.
Page 6 IronHorse®DC Gearmotors User Manual – 1st Edition, Rev. B – 05/16/2018
IronHorse® MTG DC Gearmotors
IronHorse MTG Gearmotor Dimensions
in [mm] )
• We recommend that MTGP gearmotors of this type be mounted using the four 10-32 threaded
holes shown in the front view.
• MTGP gearmotors of this type can be either foot-mounted or face-mounted. In applications
involving overhung loads, foot mounting is recommended. When face-mounting the
gearmotor, the 0.281” through-holes are preferred.
IronHorse® MTG DC Gearmotors
Page 7IronHorse®DC Gearmotors User Manual – 1st Edition, Rev. B – 05/16/2018
in [mm] )
• We recommend that MTGR gearmotors of this type be foot mounted (see section A-A). If shaft
mounted, secure the gearmotor using the 0.31” through hole shown in the side view.
• We recommend that MTGR gearmotors of this type be foot mounted. There are no through
holes or threaded holes for face mounting this gearmotor.
Page 8 IronHorse®DC Gearmotors User Manual – 1st Edition, Rev. B – 05/16/2018
IronHorse® MTG DC Gearmotors
Motor Mounting
To avoid premature motor and/or bearing failure, IronHorse gearmotors
should be installed in accordance with the guidelines listed here, as
well as the recommendations on the previous dimension-drawing pages.
There are no limitations on mounting orientation; that is, the gearmotor can be installed vertically,
horizontally, upside down, or at any angle. When necessary, use shims at the mounting bolt
holes to ensure that the equipment surface is parallel to the gearmotor mounting surface. Use
proper diameter bolts of the highest grade material available for the application, as shown on the
dimension diagrams.
A mounted gearmotor must operate vibration free. Each gearmotor installation should be checked
for potential vibration situations.
Mount IronHorse gearmotors so that they do not contact a wall or structure that would prevent
proper ventilation of the motor. The installation area should be free of dust and smoke particles.
Maximum ambient temperature should not exceed 40°C [104°F].
Correct coupling alignment is very important to the life of the gearmotor. Coupling misalignment
is the major cause of bearing failure. In belt driven applications, pulleys should be installed
correctly. Belt tension, alignment and wear should be checked at installation and at regular
maintenance intervals. Install couplings per the manufacturers instructions. Whenever possible,
direct couple or flange mount IronHorse gearmotors in their application. Doing so can greatly
extend the bearing life.
Terminal Diagram and Wiring
DC motors are very easy to wire. There are only two terminals; one for
the positive lead and one for the negative lead.
If wired correctly, the motor will turn clockwise when you are facing the
gearmotor shaft. If the gearmotor turns counterclockwise, reverse the
positive and negative leads.
M
+
-
IronHorse® MTG DC Gearmotors
Page 9IronHorse®DC Gearmotors User Manual – 1st Edition, Rev. B – 05/16/2018
Accessories
Replacement brushes and spare parts can be ordered at www.automationdirect.com.
Match the replacement brush part number against the motor horsepower carefully to ensure you
order the correct brushes for your motor. When replacing brushes, pay special attention that
the correct brush is inserted into the motor (especially if you have multiple motor sizes at your
facility). Verify that the width of the brush you remove matches the width of the replacement
brush. DO NOT install smaller brushes into a larger motor.
DC Gearmotor Replacement Brushes
Description Gearmotor
Voltage
Motor
Materials
Brushes with
springs and
caps;
(one set of 2)
P20-1Jxxx
P20-1Kxxx
12VDC
24VDC 1/5 Copper
graphite
P06-1Jxxx
P07-1Jxxx
12VDC
12VDC
1/16
1/15
P14-1Lxxx 90VDC 1/7 Carbon
graphite
P05-1Lxxx
P06-1Lxxx
90VDC
90VDC
1/19
1/17
All IronHorse DC gearmotors ship with one set of brushes installed.
DC Gearmotor Spare Parts Kit
Description
DC motor spare parts kit, for certain MTGP and all MTGR series DC gearmotors
as listed.
Includes: two metal brush cap covers, one terminal box, one 1/8 (0.125 inch)
shaft key, and one 3/16 (0.187 inch) shaft key.
MTGP-P14-1xxxx,
MTGP-P20-1xxxx;
MTGR-Pxx-1xxxx
All IronHorse DC gearmotors ship with a brush cap cover, a terminal box, and a sha key installed
(if required, depending on model #).
Page 10 IronHorse®DC Gearmotors User Manual – 1st Edition, Rev. B – 05/16/2018
IronHorse® MTG DC Gearmotors
Replacing Brushes
Warning: To prevent serious personal injury and damage to your
equipment, always disconnect input power before replacing brushes.
Brushes should be replaced after every 2500 hours of operation. If you visually inspect the
brushes, the minimum acceptable length is 6mm.
Make sure you install the correct replacement brushes; check the part numbers carefully. Ensure
that the replacement brushes are the same width as the brushes being removed from the motor.
DO NOT install smaller brushes in a larger motor. There is no break-in period with new brushes.
Replacement brush and spring assembly set:
NOTE: The brushes are spring-loaded. Be careful when removing the
brush cover.
Motor has two brushes; one on each side
of the motor.
Always replace the brushes in pairs.
1) Remove the brush cover using a
athead screwdriver as shown. Turn
the brush cover counterclockwise to
remove.
2) Carefully remove the old brush and
spring assembly and install the
replacement.
3) Reinstall the brush cover, turning
clockwise.
4) Replace the other motor brush and
spring following the same steps.
Typical for MTGP-P06-1xxxx
slot-screw cap
brush covers
(1 per side)
Typical for: MTGR-Pxx-1xxxx
MTGP-P14-1xxxx, MTGP-P20-1xxxx
dome-shaped
brush covers
(1 per side)
Routine Maintenance
A routine maintenance schedule should be developed for every IronHorse gearmotor installation
based on the individual application. Gearmotors installed in a harsh running environment
should be serviced more frequently than those installed in a clean, climate controlled area. The
following list should be used as a basis for creating the routine maintenance schedule.
1) Clean the gearmotor housing using a brush, soft cloth or compressed air.
2) Frequently monitor the motor temperature. It should not exceed 60°C [140°F].
3) Measure and record the motor running current, and verify that it is below the rated FLA. If
not, check for an overload situation (coupling issues, binding, too much load, etc.).
4) Bearings are permanently lubricated, and do not require maintenance.
IronHorse® MTG DC Gearmotors
Page 11IronHorse®DC Gearmotors User Manual – 1st Edition, Rev. B – 05/16/2018
Troubleshooting
To prevent serious damage, faults observed when a motor first goes into service or during
subsequent operation should be investigated and repaired immediately. These troubleshooting
tables cover most common PMDC motor problems.
Warning: To prevent serious personal injury and damage to your
equipment, always disconnect input power before inspecting or repairing
your motor.
Mechanical Problems – Noise While Running Problems
Motor vibrates or
runs noisily when
coupled up, but
runs okay when
uncoupled.
Defective transmission components, or
problem with the machine being driven.
Inspect transmission and drive
components. Check alignment.
Foundation has become unlevel. Realign machine set. Check and
repair foundation level.
Problem with gear drive. Align drive, check driving and driven
gear pitch circles.
Incorrectly balanced drive or driven
machine components.
Re-balance drive and/or driven
components.
Motor runs rough
when uncoupled.
Bearing damage. See Bearing Problems
troubleshooting table.
Mounting bolts are loose. Re-tighten and lock mounting bolts.
Fitted drive components (coupling or
pulleys) affecting rotor balance.
Balance rotor with coupling or pulley
fitted.
Mechanical Problems – Bearing Problems
Scratching, rubbing,
or rumbling noise
from bearing.
Bearing is defective. Replace gearmotor.
Whistling noise
from bearing.
Bearing has run dry. Replace gearmotor.
Faulty cage. Replace gearmotor.
Excessive bearing
wear. Bearing overloaded.
Check alignment, belt tension, gear pressure,
coupling thrust. Reduce bearing load. If
needed, reduce additional axial load.
Scoring when motor
is inoperative.
Bearing is being subjected to vibration
from outside source.
Isolate motor from source of vibration or
keep motor turning over.
Page 12 IronHorse®DC Gearmotors User Manual – 1st Edition, Rev. B – 05/16/2018
IronHorse® MTG DC Gearmotors
Electrical Problems
Motor shaft rotates in wrong
direction (should rotate
clockwise when facing
shaft).
Positive (+) and negative
(-) input power leads are
reversed.
Switch the input power connections.
Motor fails to start off-load.
Break in the armature supply. Check and repair connection.
Fuse is blown. Replace fuse.
Controller damaged or
incorrectly connected. Check starter for break in circuit and repair break.
Armature coils burned out or
short-circuiting.
Correct short circuit. This may require bringing the
motor to a repair shop.
Brushes not bearing down
correctly.
Check brush position and bearing pressure.
Replace worn brushes.
Jerky starting.
Break in starter circuit. Repair break.
Armature short circuit. Correct short circuit. This may require bringing the
motor to a repair shop.
Commutator short circuit. Check commutator and repair short circuit.
Motor will not run under
load.
Short circuit in the supply. Locate short circuit and repair.
Overloading. Check current input and remedy overload.
Voltage drop. Increase supply line cross section.
Motor overspeeding and
hunting while under load. Controller.
Decrease IR compensation.
Check speed potentiometer wiring and signal, and
repair if needed.
Motor overheating.
Overloading. Check voltage and current levels, and correct
overload condition.
Insufficient airflow. Improve cooling conditions.
Cooling air temperature too
high. If TEFC model, inspect the fan for damage.
Armature winding short circuit. Check windings and soldered connections. Repair
coils or windings.
IronHorse® MTG DC Gearmotors
Page 13IronHorse®DC Gearmotors User Manual – 1st Edition, Rev. B – 05/16/2018
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