ABB RHD Series Original operating manual

—
ABB MEASUREMENT & AN
ALYTICS | SERVICE INSTRUCTION | SEI/RHD250/4000-EN REV. A
RHD250 to 4000 (Contrac)
Electrical rotary
actuator
—
ABB Measurement & Analytics
For your local ABB contact,
visit:
www.abb.com/contacts
For more product information, visit:
www.abb.com/actuators
Electrical rotary actuator
for the
operation of final control elements
.
SEI/RHD250/4000
-EN Rev. A 05.2020
—
RHDE250
RHDE500
RHDE800
RHDE1250
RHDE2500
RHDE4000
Introduction
Compact actuator for the
operation of final
control elements with preferably 90° rotary
movement such as valve flaps, ball valves,
etc.
The nominal torque is transferred through a lever
actuator. A special electronic unit controls the
actuator. The special electronic unit serves
as the
interface between actuator and control system.
Additional Information
Additional documentation on
RHD250 to 4000
(Contrac)
is available for download free of charge at
www.abb.com/actuators.
Alternatively simply scan this
code:
—
We reserve the right to make technical changes or
modify the contents of this document
without prior
notice. With regard to purchase orders, the agreed particulars shall prevail.
ABB does not accept any
responsibility whatsoever for potential errors or possible lack of
information in this document.
We reserve all rights in this document and in the
subject matter and illustrations contained
therein.
Any reproduction, disclosure to third parties or utilization of its contents – in whole
or in parts
– is forbidden without prior written consent of ABB.
© ABB 2020 3KXE111019R4301

2 RHD250 to 4000 (Contrac) ELECTRICAL ROTARY ACTUATOR | SEI/RHD250/4000-EN REV. A
Table of contents
1Safety.......................................................................... 3
General information and instructions.................................. 3
Warnings.................................................................................... 3
Intended use .............................................................................4
Improper use.............................................................................4
Notes on data safety ...............................................................4
Warranty provisions.................................................................4
Manufacturer’s address ..........................................................4
2Introduction ...............................................................5
Safety and precautions ...........................................................5
Tools ...........................................................................................5
3Lubrication .................................................................6
Mounting position...............................................................6
Oil change..................................................................................6
RHD oil types........................................................................ 7
4Maintenance...............................................................8
Safety instructions...................................................................8
General .......................................................................................8
Lever ...........................................................................................8
Lever removal............................................................................8
Lever installation .................................................................9
Ball-and-socket-joint ..........................................................9
Tightening torques and dimensions of lever screws .10
Sealing ring of output drive shaft ....................................... 11
Sealing ring of hand wheel drive / hand wheel shaft ...... 12
Sealing of the position sensor drive................................... 12
RHD250...RHD800 ............................................................. 12
RHD1250... RHD4000 ............................................................. 13
Motor........................................................................................ 13
Motor assignment and tightening torque.................... 13
Motor removal....................................................................14
Motor flange O-ring .......................................................... 14
Motor disassembly / assembly ...................................... 15
Exchange of motor bearings...........................................18
Exchange of motor shaft sealing ring ........................... 18
Brake adjustment...................................................................19
Brake of motor series 1 ......................................................... 19
Brake of motor series 2.........................................................19
5Electrical connections.............................................20
General .....................................................................................20
Covers.......................................................................................20
Electronic Unit EBN853 (Contrac) / EBN861 (Contrac) /
EBS862 (Contrac) ................................................................... 21
Analog / Digital.................................................................. 21
PROFIBUS DP®....................................................................22
Electronic Unit EBN852 (Contrac) .......................................23
Analog / Digital..................................................................23
Fuses ........................................................................................ 24
Electronic unit for field installation............................... 24
Electronic units for rack installation ............................. 24
Fuse location EBN853 ...................................................... 25
Fuse location EBN861 / EBS862 ..................................... 25
External fuses for EBN861 / EBS862 ............................. 26
Fuse location in EBS852................................................... 26
6Exchange of position sensor ..................................27
Dismounting........................................................................... 27
Mounting................................................................................. 27
Mounting................................................................................. 28
7Electrical test values .............................................. 29
Test values (position sensor) .............................................. 29
Test values (Brake and Motor) ............................................30
Brake voltage.....................................................................30
Motor voltage ....................................................................30
Winding resistance ...........................................................30
8Troubleshooting ......................................................31
LED signals at commissioning and service field...............31
9Troubleshooting ......................................................31
General..................................................................................... 32
Failures at brake, fuse or wiring ......................................... 33
Operation mode (MAN / AUT)............................................. 34
Input configuration ............................................................... 35
Operation behind step controller....................................... 36
Failure Diagram...................................................................... 37
Failure due to response of positioning loop monitoring
38
General..................................................................................... 38
User interface menus............................................................ 39

RHD250 to 4000 (Contrac) ELECTRICAL ROTARY ACTUATOR | SEI/RHD250/4000-EN REV. A 3
1Safety
General information and instructions
These instructions are an important part of the product and
must be retained for future reference.
Installation, commissioning, and maintenance of the product
may only be performed by trained specialist personnel who have
been authorized by the plant operator accordingly. The specialist
personnel must have read and understood the manual and must
comply with its instructions.
For additional information or if specific problems occur that are
not discussed in these instructions, contact the manufacturer.
The content of these instructions is neither part of nor an
amendment to any previous or existing agreement, promise or
legal relationship.
Modifications and repairs to the product may only be performed
if expressly permitted by these instructions.
Information and symbols on the product must be observed.
These may not be removed and must be fully legible at all times.
The operating company must strictly observe the applicable
national regulations relating to the installation, function testing,
repair and maintenance of electrical products.
Warnings
The warnings in these instructions are structured as follows:
DANGER
The signal word ‘DANGER’ indicates an imminent danger.
Failure to observe this information will result in death or
severe injury.
WARNING
The signal word ‘WARNING’ indicates an imminent danger.
Failure to observe this information may result in death or
severe injury.
CAUTION
The signal word ‘CAUTION’ indicates an imminent danger.
Failure to observe this information may result in minor or
moderate injury.
NOTICE
The signal word ‘NOTICE’ indicates possible material damage.
Note
‘Note’ indicates useful or important information about the
product.

4 RHD250 to 4000 (Contrac) ELECTRICAL ROTARY ACTUATOR | SEI/RHD250/4000-EN REV. A
… 1 Safety
Intended use
Control actuators are used exclusively for operating final control
elements (valves, valve flaps, etc.).
They may only be operated using a suited Contrac electronic unit
for field installation or mounting rack installation.
In addition to this operating instruction, the relevant
documentation for the electronic unit and software tool must be
observed.
Improper use
The following are considered to be instances of especially
improper use of the device:
• For use as a climbing aid, for example for mounting
purposes.
• For use as a bracket for external loads, for example as a
support for piping, etc.
• Material application, for example by painting over the
housing, name plate or welding/soldering on parts.
• Material removal, for example by spot drilling the
housing.
Notes on data safety
This product is designed to be connected to and to
communicate information and data via a network interface.
It is operator’s sole responsibility to provide and continuously
ensure a secure connection between the product and your
network or any other network (as the case may be).
Operator shall establish and maintain any appropriate measures
(such as but not limited to the installation of firewalls,
application of authentication measures, encryption of data,
installation of anti-virus programs, etc.) to protect the product,
the network, its system and the interface against any kind of
security breaches, unauthorized access, interference, intrusion,
leakage and / or theft of data or information.
ABB Automation Products GmbH and its affiliates are not liable
for damages and / or losses related to such security breaches,
any unauthorized access, interference, intrusion, leakage and /
or theft of data or information.
Warranty provisions
Using the device in a manner that does not fall within the scope
of its intended use, disregarding this manual, using
underqualified personnel, or making unauthorized alterations
releases the manufacturer from liability for any resulting
damage. This renders the manufacturer's warranty null and void.
Manufacturer’s address
ABB Automation Products GmbH
Measurement & Analytics
Schillerstr. 72
32425 Minden
Germany
Tel: [phone]
Fax: [phone]
Customer service center
Tel: [phone]
Email: automation.servic[email protected].com

RHD250 to 4000 (Contrac) ELECTRICAL ROTARY ACTUATOR | SEI/RHD250/4000-EN REV. A 5
2Introduction
1
Hand wheel crank
2
Handwheel
3
Ball-and-socket joint
4
Output lever
5
Lever cover
6
Output shaft
7
Adjustable stops
(under the lever cover)
8
Control motor
9
Handwheel unlock
Figure 1: RHD (illustrations may differ from actual installation)
This service instruction refers to the ABB rotary actuators
RHD250 to RHD4000.
It amends and deepens the routine maintenance description in
the standard instruction, which we strongly recommend being
also available for all maintenance work.
Safety and precautions
When mounting the actuator in areas which may be accessed by
unauthorized persons, take the required protective measures.
• The actuators perform movements for positioning vanes and
valves. Handle properly and with care. Otherwise, a hazard of
bruise injuries may arise.
• When changing the oil of the actuator, thoroughly remove
any oil that may have run down on the floor during the
procedure to avoid accidents.
• Dispose of the waste oil in compliance with the respective
local regulations. Make sure that no waste oil reaches the
water cycle.
• Only qualified specialists who have been trained for these
tasks are authorized to mount and adjust the control
actuator, and to make the electrical connection.
• When working on the actuator itself or the electronics always
observe the locally valid accident prevention regulations and
the regulations concerning the construction of technical
installations.
• Use the eye bolt at the actuator to lift or lower it. Only load it
vertically. Do not lift or lower the actuator when it is mounted
on a valve or similar final control element.
• Switch-off the voltage supply; make sure that unintentional
switching on is not possible.
• Make sure that switching off the power supply does not
affect the plant process.
• Make sure that the final control element is not exposed to
process forces.
Tools
NOTICE
Damage to the device due to improper tools!
Using improper tools may damage the actuator or its
components.
• Only use proper tools for maintenance work.
Note
• Maintenance at Contrac actuators requires tools which are
usually available in a workshop. Please consider that all
dimensions are based on the metrical system. This applies
also for the wrench sizes, threads etc.
• Use appropriate sleeves for the installation of the sealing
rings (see Sealing ring of output drive shaft on page 11 for
details).

6 RHD250 to 4000 (Contrac) ELECTRICAL ROTARY ACTUATOR | SEI/RHD250/4000-EN REV. A
3Lubrication
Mounting position
The spur gearing of the actuator RHD250 / RHD500 / RHD800 /
RHD1250 / RHD2500 / RHD4000 (Contrac) are lubricated with
oil. They contain the max. oil quantity when leaving the
manufacturer. Once the actuator is installed replace the
uppermost check plug by the separately supplied venting plug.
1
Control screw
2
Vent valve
Figure 2: Permissible mounting positions
The mounting positions presented are permissible. To facilitate
mounting and maintenance, however, it is recommended that
you use position IMB 3 For each mounting position, you should
check the specified oil level before commissioning, see Filling
volumes on page 7.
To achieve this, allow for the following minimum distances:
Actuator
A
RHD250
40 mm (1.
57 in)
RHD500 / RHD800
30 mm (1.18 in)
RHD1250 / RHD2500
40 mm (1.57 in)
RHD4000
40 mm (1.57 in)
Oil change
Note
Oils for different temperature ranges may not mixed.
During an oil change, thoroughly remove any oil that may have
escaped to avoid accidents.
Dispose of old oil according to local regulations. Make sure that
the oil does not enter the water cycle. Make sure that any oil
leaking from the device cannot come into contact with hot
components.
Proceed as follows to drain or change the oil:
1. Provide a collecting vessel capable of holding the expected
oil quantity in accordance with Filling volumes on page 7 .
2. Open and release the vent valve, see Mounting position on
page 6.
3. Unscrew the lowermost drain plug to drain the oil.
4. Collect the oil in the collection vessel.
5. Make sure all of the oil has been removed from the actuator
housing.
6. Screw the drain plug back in.
7. Refill with the proper volume of oil in accordance with Filling
volumes on page 7 and securely tighten the vent valve.

RHD250 to 4000 (Contrac) ELECTRICAL ROTARY ACTUATOR | SEI/RHD250/4000-EN REV. A 7
RHD oil types
Ambient temperature
Oil types - DIN 51517
Default oil filled with delivery
Alternative oil
−
10 to 65 °C (15 to 150 °F) Castrol Alpha BMP 220 –
DIN 51517
ESSO Spartan EP 220 – DIN 51517 / ISO 12925-
1
BP Energol GR-XP 220 – DIN
51517
Shell Omala 220 – DIN 51517 / ISO 12925-
1
Mobilgear 630 – DIN 51517 / ISO 12925-1
−
30 to 50 °C (−20 to 130 °F) Mobil SHC 629 – DIN 51517 / ISO 12925-
1
-
−1 to 85 °C (30 to 185 °F)
Mobil SHC 632 – DIN 51517 / ISO 12925-1
-
Filling volumes
RHD250
Mounting position
IMB 3
IMB 6
IMB 7
IMV 5
IMV 6 / IMB 8
Minimum oil level l
(gal)* Approx. 4.7
(1.24)
Approx. 4.7 (1.24)
Approx. 4.7 (1.24)
Approx. 4.7 (1.24)
Approx. 4.7 (1.24)
Minimum oil level under inspection
plug mm (in)
40 (1.57)
12 (0.47)
15 (0.59)
35 (1.38)
Lower edge of upper oil
plug
RHD500 / RHD800
Mounting position
IMB 3
IMB 6
IMB 7
IMV 5
IMV 6 / IMB 8
Minimum oil level l (gal)*
Approx. 10 (2.65)
Approx. 11.5 (3.04)
Approx. 10 (2.65)
Approx. 10 (2.65)
Approx. 10 (2.65)
Minimum oil level under inspection
plug mm (in)
57 (2.24)
Lower edge of upper oil
plug
15 (0.59)
37
(1.46)
Lower edge of upper oil
plug
RHD1250 / RHD2500
Mounting position
IMB
3
IMB
6
IMB
7
IMB
8
IMV
5
IMV
6
Minimum oil level l (gal)*
Approx. 29 (7.67)
Approx. 32 (8.47)
Approx. 24 (6.34)
Approx. 24 (6.34)
Approx. 33 (8.72)
Approx. 26.5 (7.01)
Minimum oil level under inspection
plug mm
(in)
75 (2.95)
90 (3.54)
200 (7.87)
Lower edge of upper oil plug.
Delivered filled with 33
l
(8.72
gal*).
34 (1.34)
35 (1.38)
RHD4000
Mounting position
IMB 3
IMB 6
IMB 7
IMB 8
IMV 5
IMV 6
Minimum oil level l (gal)*
Approx. 29 (7.67)
Approx. 32 (8.47)
Approx. 24.5 (6.47)
Approx. 24 (6.34)
Approx. 34 (8.98)
Approx. 26.5 (7.01)
Minimum oil level under inspection
plug mm
(in)
75 (2.95)
90 (3.54)
200 (7.87)
Lower edge of upper oil plug.
Delivered filled with 33
l
(8.72 gal*).
34 (1.34)
35 (1.38)
* US liquid gallon

8 RHD250 to 4000 (Contrac) ELECTRICAL ROTARY ACTUATOR | SEI/RHD250/4000-EN REV. A
4Maintenance
Safety instructions
WARNING
Risk of injury due to live parts!
Risk of death or serious injuries due to electricity and
unexpected machine movements. In automatic mode the
motor is always under power, even at standstill.
• When working on the actuator or the related subassembly,
switch off the supply voltage for the electronic unit and
separate anti-condensation heater (option), and take
precautions to prevent unintentional switch-on.
Repair and maintenance activities may only be performed by
authorized customer service personnel.
When replacing or repairing individual components, use original
spare parts.
General
Contrac actuators feature a robust construction. As a result,
they are highly reliable and require minimal maintenance. The
maintenance intervals depend upon the effective load and are
therefore not specified here.
The built-in microprocessor evaluates the actual load factors
(e.g. torques, forces, temperatures, etc.) and derives the
remaining operating time until the next routine maintenance is
required.
Use the configuration program to view this information.
Apart from the load dependent maintenance intervals
determined by the microprocessor we recommend routine
maintenance at least every 10 years.
The following description of the maintenance work provide that
the actuator is disconnected from the damper and that all
electrical supply is disconnected.
Lever
Lever removal
Figure 3: Lever mounted on the shaft
Figure 4: Use of draw-off tool for lever removal
In some case it may be useful to detach the linkage bar from the
ball-and-socket-joint, however, it is not absolutely necessary.
Refer to Figure 3 and Figure 4 for the removal procedure:
1. Loosen the clamping screw 2.
2. Use an expanding screw 1to spread the lever seat.
3. Push a counterpart 3(soft metal) into the lever gap in
order to protect the expanding screw thread.
4. Put the claws of the drawing tool 9behind the lever 4
and place the bolt end 8on the shaft 6.
5. Put an appropriate tool onto the hexagon end 7of the
drawing tool bolt.
6. Turning the bolt clockwise will pull the lever from the
shaft end.

RHD250 to 4000 (Contrac) ELECTRICAL ROTARY ACTUATOR | SEI/RHD250/4000-EN REV. A 9
Lever installation
NOTICE
Make sure that the shaft surface and the shaft bore in the
ever are clean and free of grease or any other lubricant.
1. Put the appropriate key 5into the groove in the shaft.
2. Use an expanding screw to spread the lever seat.
3. Push a counterpart (soft metal) into the lever gap in order to
protect the expanding screw thread.
4. Push the lever onto the shaft until it is nearly in the same
position as it was before.
5. Put the lever clamping bolt into the lever and tighten the
nut(s), refer to Tightening torques and dimensions of lever
screws on page 10 for torque values.
Ball-and-socket-joint
Figure 5: Ball-and-socket-joint
Figure 6: Use of draw-off tool
In some case it may be useful to detach the linkage bar from the
ball-and-socket-joint, however, it is not absolutely necessary.

10 RHD250 to 4000 (Contrac) ELECTRICAL ROTARY ACTUATOR | SEI/RHD250/4000-EN REV. A
… 4 Maintenance
… Lever
Note
The ball-and-socket joint may be mounted / removed with the
lever mounted on the shaft or with dismounted lever. If the lever
remains mounted on the shaft, move it into a position, where
you get free access from the rear lever side.
Removal
1. Pull the cotter pin 1out of the castle nut 2.
2. Screw-off the castle nut.
3. Put an appropriate draw-off tool 3onto lever 4and joint
bolt 5(see Figure 6for details); make sure that the
claws 6grip symmetrically behind the lever and that the
bolt tip is on the joint bolt center.
4. Put a wrench onto the opposite bolt end and turn the bolt
clockwise.
5. Press the joint bolt out of the lever.
Installation
1. Push the bolt of the ball-and-socket joint into the lever hole.
2. Put the crown nut onto the bolt and tighten it with the
required torque, refer to Tightening torques and dimensions
of lever screws on page 10 for torque values.
3. Secure the crown nut with a new cotter pin 1.
Tightening torques and dimensions of lever screws
Actuator
Clamping Screw
Limit stop screw
Crown nut
Expanding screw
(tightening torque)
(tightening torque)
(tightening torque)
(diam. / min. length / min. thread length)
RHD250
M12×50
-8.8
(79 Nm / 58 ft-lbs)
M12×35
-8.8
(79 Nm / 58 ft-lbs)
M18×1.5
(165 Nm / 122 ft-lbs)
8 mm / 35 mm / 25 mm
RHD500 / RHD800
M16×80
-8.8
(195 Nm / 144 ft
-lbs)
M16×35
-8.8
(195 Nm / 144 ft
-lbs)
M28×1.5
(370 Nm / 273 ft
-lbs)
8 mm / 45 mm / 25 mm
RHD1250 / RHD2500
M20×110
-8.8
(390 Nm / 288 ft-lbs)
M24×55
-8.8
(670 Nm / 494 ft-lbs)
M30×1.5
(455 Nm / 336 ft-lbs)
10 mm / 55 mm/ 20 mm
RHD4000
M20×120
-8.8
(390 Nm / 288 ft-lbs)
M24×55
-8.8
(670 Nm / 494 ft-lbs)
M38×1.5
(750 Nm / 553 ft-lbs)
12 mm / 65 mm / 35 mm

RHD250 to 4000 (Contrac) ELECTRICAL ROTARY ACTUATOR | SEI/RHD250/4000-EN REV. A 11
Sealing ring of output drive shaft
A
Drive pinion
B
Output shaft
C
Handwheel mechanism
D
Motor
E
Brake
Figure 7: Sectional view of PME120
The following general explanations for the sealing ring
replacement do not exclusively apply for the output shaft but
also for the other sealing rings.
In order to change the O-ring 2and sealing ring 4of the
output drive shaft proceed as follows:
1. Remove lever or coupling from the output shaft 5.
2. Make sure that the oil level is below the O-ring 2.
3. If necessary, drain the oil (see Mounting position on
page 6).
4. Remove the key 6.
5. Loosen and remove the flange screws.
6. Two tap holes (thread size: M6) on the bolt circle for the
flange screws allow to use forcing screws; turn these screws
clockwise to remove the flange 3; the thread length of the
forcing screws should be at least 25 mm.
7. Pull the flange3from the shaft.
8. Turn the forcing screws out.
9. Take the O-ring 1and the sealing ring 2out.
10. Clean the shaft and the flange; slightly grease the sealing
ring.
11. Replace the O-ring and the sealing ring.
12. Cover the key groove in the shaft prior to the flange re-
installation in order to avoid any damage of the new sealing
ring.
13. Push the flange carefully over the shaft and fasten the flange
screws crosswise; tightening torque for the flange screws =
2.8 Nm (2.01 ft-lbs).
14. Remove key cover and re-install key 4, lever or coupling.
Note
Make sure that the ‘open’ side of the sealing ring points towards
the oil
1
Sealing ring
2
Flange
3
Sleeve (auxiliary tool)
Figure 8: Flange and sealing ring / Use of auxiliary tool for sealing ring installation
(exemplary picture)

12 RHD250 to 4000 (Contrac) ELECTRICAL ROTARY ACTUATOR | SEI/RHD250/4000-EN REV. A
… 4 Maintenance
Sealing ring of hand wheel drive / hand
wheel shaft
1
O-ring
2
Housing flange
3
Flange screws
4
Sealing ring
5
Screws
6
Hand wheel
Figure 9: Handwheel
DANGER
Danger to life due to unexpected movement of the actuator!
Restoring process forces may move the actuator when you
release the handwheel!
In order to change the handwheel O-ring 1of the drive proceed
as follows:
1. Make sure that the oil level is below the O-ring 1.
2. Drain the oil if necessary (see Oil change on page 6 for
details).
3. Turn flange screws 3out.
4. Pull entire hand wheel drive assembly out of the gearing
engagement.
5. Replace the O-ring 1.
6. If additionally the shaft sealing ring 4needs to be replaced,
turn the wheel fastening screws 5out and put the hand
wheel 6aside.
7. Take the shaft sealing ring 4out.
8. Grease the new the shaft sealing ring 4slightly with oil and
put it into the groove; consider the exemplary hints and
illustration of Sealing ring of output drive shaft on page 11.
9. Fasten the hand wheel 6and re-install the entire assembly;
tightening torque for the screws 3= 20 Nm (15 ft-lbs).
Sealing of the position sensor drive
RHD250...RHD800
1
Flange fastening screw
2
O-ring
3
Flange
4
Sealing ring
5
Shaft
6
Hexagon screw
7
Pinion
Figure 10: Position sensor drive
In order to change the O-ring 2and the sealing ring 4, firstly
remove the position sensor Dismounting on page 27 and
proceed as follows:
1. Make sure that the oil level is below the O-ring 2.
2. Drain the oil if necessary (Mounting position on page 6 for
details).
3. Loosen the hexagon screw 6and pull apart the pinion 7.
4. Undo flange fastening screws 1.
5. Pull the flange 3with sealing ring 4carefully from the
shaft 5and put it aside.
6. Replace the O-ring 2.
7. Pull the old sealing ring 4out of the groove.
8. Grease the new sealing ring slightly with oil and put it in.
9. Clean the shaft and the contact surfaces of the flange.
10. Carefully push the flange 3with O-ring 2and sealing
ring 4on the shaft; take care that the shaft end does not
damage the sealing ring.
11. fasten the flange 3and thighten the screws 1crosswise
with 8.3 Nm (6.12 ft-lbs).
12. fasten the pinion 7and tighten the hexagon screw 6with
42 Nm (31 ft-lbs).

RHD250 to 4000 (Contrac) ELECTRICAL ROTARY ACTUATOR | SEI/RHD250/4000-EN REV. A 13
RHD1250... RHD4000
1
Hood fastening screw
2
O-ring
3
Hood
4
Sealing ring
5
Shaft
6
Hexagon screw
7
Pinion
Figure 11:
In order to change the O-ring 2and the sealing ring 4, firstly
remove the position sensor Dismounting on page 27 and
proceed as follows:
1. Make sure that the oil level is below the O-ring 2
2. Drain the oil if necessary (Mounting position on page 6 for
details).
3. Loosen the hexagon screw 6and pull apart the pinion 7
4. Undo hood fastening screws 1
5. Pull the hood 3with sealing ring 4carefully from the
shaft 5and put it aside
6. Replace the O-ring 2
7. Pull the old sealing ring 4out of the groove
8. Grease the new sealing ring slightly with oil and put it in
9. Clean the shaft and the contact surfaces of the hood
10. Push carefully the hood 3with O-ring 2and sealing
ring 4on the shaft; take care that the shaft end does not
damage the sealing ring
11. Fasten the hood 3and thighten the screws 1crosswise
with 23 Nm (17 ft-lbs)
12. Fasten the pinion 7and tighten the hexagon screw 6with
42 Nm (31 ft-lbs)
Motor
By the time of printing this document Contrac actuators use two
basic motor series.
Motor type MC..71..... MC..100 of the series 1 feature a ‘C’ at the
end of the name code, motor type MC..71..... MC..100 of the
series 2 feature a ‘D’.
Motor type MC..112 of the series 1 features a ‘B’ at the end of the
name code, motor type MC..112....of the series 2 features a ‘C’.
See 4.6.1 for details.
Both series differ in minor details which are named where
applicable.
Motor assignment and tightening torque
Tightening torque for motor screws
Actuator
Motor
Add. flange
Tightening
torque
RHD250-10
MCS 71 BA / MCSS71BA
—
20 Nm (15 ft-lbs)
RHD500
-10
MCS 71 BA / MCSS71BA
—
20 Nm (15 ft-
lbs)
RHD800-10
MCS 80 BA / MCSS80BA
—
20 Nm (15 ft-lbs)
RHD1250
-12
MCS 80 BA/ MCSS80BA
—
20 Nm (15 ft-
lbs)
RHD2500-10
MC 90 BA
46 Nm (34 ft-lbs)
40 Nm (30 ft-lbs)
RHD2500
-25
MCS 80 BA
—
20 Nm (15 ft-
lbs)
RHD4000-10
MC 100 BA
79 Nm (58 ft-lbs)
69 Nm (50 ft-lbs)
RHD4000
-40
MC 90 BA
46 Nm (34 ft-
lbs)
40 Nm (30 ft-
lbs)

14 RHD250 to 4000 (Contrac) ELECTRICAL ROTARY ACTUATOR | SEI/RHD250/4000-EN REV. A
… 4 Maintenance
… Motor
Motor removal
DANGER
Danger to life due to unexpected movement of the actuator!
Note that the actuator position may be changed accidentally
by the external load on the drive when the brake is released, or
the motor is removed.
1
Motor connection cable
2
Motor terminal box
3
Motor
4
Motor fastening screws
Figure 12: Rear motor view (exemplified)
1. Disconnect the motor / actuator from any electrical supply.
2. Disconnect motor connection cable in motor terminal box.
3. Drain the oil (see Mounting position on page 6 for details).
4. Undo the 4 motor fastening screws.
5. Pull the motor carefully out.
6. Once the motor overhaul is finished, replace the motor
sealing ring in any case.
7. Install the motor in reverse order.
Motor flange O-ring
1
Motor screw
2
O-ring
3
Flange
4
O-ring
5
Screw
6
Motor
Figure 13: Exemplary depiction of motor connection; additional flange
3
not used for
all motors
In order to change the flange O-ring proceed as follows:
1. Disconnect the electrical power supply prior to any
maintenance
2. Make sure that the oil level is below the O-ring 4
3. Drain the oil if necessary Mounting position on page 6.
4. Disconnect the cables in the motor terminal box
5. Turn the motor screws 1out and put the motor aside;
remove O-ring 2
6. Turn the screws 5of the add. flange out and put the
flange 3aside; remove O-ring 4
7. Replace O-ring 4
8. Mount the additional flange 3at the actuator housing and
fasten it with the flange screws 5
9. Put the new O-ring 2into the flange groove and fasten the
motor with the screws 1; consider tightening torque shown
Motor assignment and tightening torque on page 13.

RHD250 to 4000 (Contrac) ELECTRICAL ROTARY ACTUATOR | SEI/RHD250/4000-EN REV. A 15
Motor disassembly / assembly
Motors without fan on rear shaft end
1
Brake cover screw
2
Cover
3
Brake fastening screw
Figure 14: Brake cover removal (I); example shows motor of series 1
Additionally remove the brake for motor ball bearing
replacement.
1. Undo brake cover screws 1and put cover 2aside.
2. Disconnect the two cables.
3. Undo the brake fastening screws 3and put brake body with
disk aside.
1
Retaining ring plier
2
Retaining ring
3
Brake pinion
Figure 15: Brake removal (II); example shows motor of series 1
4. Use an appropriate retaining ring pliers 1to get the
retaining ring 2for the brake pinion 3out.
5. Pull the brake pinion 3from the shaft.
1
Key
2
Flange screw
3
Extraction tool
Figure 16: Removal of the motor flange; example shows motor of series 1
6. Remove the drive pinion.
7. Pull the key 1out of the motor shaft.
8. Undo motor flange screws 2.
9. Use an appropriate extraction tool to pull the flange from the
stator housing (see Figure 16).

16 RHD250 to 4000 (Contrac) ELECTRICAL ROTARY ACTUATOR | SEI/RHD250/4000-EN REV. A
… 4 Maintenance
… Motor
Motors with fan on rear shaft end
1
Cover
2
Cover screws
3
Motor
Figure 17: Cover removal
1. Undo the cover screws 2and remove the cover 1.
1
Split ring pliers
2
Split ring
3
Fan
Figure 18: Split ring removal
2. Use appropriate split ring pliers 1and removal tool to
remove the split ring 2and the fan 3.
1
Removal tool
Figure 19: Removal tool
3. Remove the fan.
1
Rear end of motor shaft
2
Brake cover screws
Figure 20: Undo brake cover
4. Undo brake cover screws 2.
1
Sealing ring
2
Brake cover
Figure 21: Remove brake cover
5. Remove brake cover 2.
1
Shrinkable tube
2
Brake screws
Figure 22: Brake (motor series 1)
6. Undo brake screws 2.
7. Open shrinkable tube 1and disconnect cable.

RHD250 to 4000 (Contrac) ELECTRICAL ROTARY ACTUATOR | SEI/RHD250/4000-EN REV. A 17
1
Brake body
2
Brake disk
Figure 23: Brake body removal (motor series 1)
8. Take brake body 1apart.
1
Brake disk
2
Brake disk pinion
1
Brake body
2
Brake disk
Figure 24: Brake disk removal (motor series 1)
9. Take brake disk 1apart.
10. Remove retaining ring from brake disk pinion 2and pull the
pinion from the shaft (see Figure 15 on page 15)
11. See Brake adjustment on page 19.
1
Pinion screw
2
Pinion
3
Removal tool
Figure 25: Pinion removal
12. Undo pinion screw 1; use appropriate retainer to secure the
screw when re-assembling (DELO-ML 5228 or LOCTITE 243;
both medium-firm; detachable)
13. Use appropriate removal tool 3to pull the pinion 2from
the shaft.
14. Do not damage the threaded center hole
1
Key hole
2
Key
3
Front flange
4
Motor housing
Figure 26: Remove the key
15. Remove the key 2; note the key position (key hole 1)
before you take it out of the shaft groove
16. Pull front flange 3with motor shaft out of the motor
housing 4.
1
Spring washer
Figure 27: Pinion removal
17. Remove bearing support washer (spring washer 1); take
care to place it properly when re-assembling the motor.

18 RHD250 to 4000 (Contrac) ELECTRICAL ROTARY ACTUATOR | SEI/RHD250/4000-EN REV. A
… 4 Maintenance
… Motor
1
Retaining ring pliers
2
Front flange
Figure 28:
18. Use appropriate retaining ring pliers 1to remove the
bearing retaining ring out of the front flange 2.
19. Pull the shaft out of the flange.
Exchange of motor bearings
1
Extraction tool
2
Tool claws
3
Inner ball bearing ring
Figure 29: Removal of motor ball bearing (exemplified; illustration applies to all motors)
1. Use an appropriate extraction tool 1for bearing removal.
2. Make sure that the extraction tool claws 2pull at the inner
ball bearing ring 3.
Exchange of motor shaft sealing ring
A
Sealing ring seat with shoulder
B
sealing ring seat without
shoulder
C
Oil
1
Sealing ring
2
shoulder
3
Sleeve
4
Motor flange
Figure 30: Inside of the motor flange
1. Take the old sealing ring out
2. Grease the new sealing ring and press it in the flange as
shown in Figure 30; make sure that the ‘open’ Part of the
sealing ring points towards the oil (when the motor is
mounted to the actuator); see Figure 30.
3. Assemble in reverse order; use a customary sealant for both
motor flanges
4. Check the brake gap after re-assembly; see Brake
adjustment on page 19 for details.
1
Sleeve
2
Sealing ring
3
Flange
Figure 31: Mounting the sealing ring

RHD250 to 4000 (Contrac) ELECTRICAL ROTARY ACTUATOR | SEI/RHD250/4000-EN REV. A 19
Brake adjustment
Brake of motor series 1
WARNING
Risk of injury
Note that the actuator position may be changed accidentally
by the external load on the drive when the brake is released or
the motor is removed.
Note
Do not turn the slotted nut 1. It preloads the brake spring. Any
disadjustment may reduce the brake
force and thus disable the brake to hold the actuator in position!
1
Slotted nut
2
Socket head screws
3
Coil body
4
Brake disk
5
Counter nuts
Figure 32: Brake of motor series 1
In automatic mode the brake is permanently released. Therefore,
it is not exposed to wear and does usually not require any re-
adjustment. The gap between coil body and brake disk should be
approx. 0.2+0.1 mm (0.008 to 0.012 inch). To check the gap
switch-off the voltage supply and put a thickness gauge
between the coil body 3and the brake disk 4. If the brake
requires an adjustment (e. g. after replacement) proceed as
follows:
1. Disconnect the voltage supply.
2. Remove the brake cover.
3. Loosen the socket head screws 2.
4. Put a thickness gauge (0.2 mm) between the coil body 3
and the thrust plate 4.
5. Turn the counter nuts 5until the thickness gauge is
tautly between coil body 3and thrust plate 4.
6. Tighten the socket head screws 2evenly.
Brake of motor series 2
WARNING
Risk of injury
Note that the actuator position may be changed accidentally
by the external load on the drive when the brake is released or
the motor is removed.
1
Socket head screws
2
Coil body
3
Thrust plate
4
Brake disk
5
Base plate
Figure 33: Brake of motor series 2
In automatic mode the brake is permanently released. Therefore,
it is not exposed to wear and does usually not require any re-
adjustment. The gap between coil body and brake disk should be
approx. 0.2+0.1 mm (0.008 to 0.012 inch). To check the gap
switch-off the voltage supply and put a thickness gauge
between the coil body 2and the brake disk 4. If the brake
requires an adjustment (e. g. after replacement) proceed as
follows:
1. Disconnect the voltage supply.
2. Remove the brake cover.
3. Turn the socket head screws 1completely out.
4. Take the brake body 2off.
5. Turn the hexagon nuts 4cw until they are in touch with
the brake body 2.
6. Put the brake body 2onto the shaft and tighten the
screws 1; hand screwed.
7. Turn the hexagon nuts 4ccw until they are in touch with
the base plate 5.
8. Evenly turn the socket head screws 1approx 1/3 turn
ccw (approx 120°); this also lifts the hexagon nuts 4.
9. Turn the hexagon screws 4until they are in touch with
the brake body 5.
10. Check the gap between brake body 2and thrust
plate 3using a thickness gauge 0.2+0.1 mm
(0.008 to 0.012 inch).

20 RHD250 to 4000 (Contrac) ELECTRICAL ROTARY ACTUATOR | SEI/RHD250/4000-EN REV. A
5Electrical connections
WARNING
Risk of injury due to live parts!
Risk of death or serious injuries due to electricity and
unexpected machine movements. In automatic mode the
motor is always under power, even at standstill.
• When working on the actuator or the related subassembly,
switch off the supply voltage for the electronic unit and
separate anti-condensation heater (option), and take
precautions to prevent unintentional switch-on.
General
The cable between actuator and electronic unit is connected to
the electronic unit via terminals and to the actuator via a plug.
The plug housing may contain a carrier for terminals or for the
cable ends with crimp sockets.
1
Terminal carrier
2
Cables with cable end sleeve
3
Crimp carrier
4
Cables with crimp pins
5
Plug housing
6
Carrier
7
Male carrier
Figure 34: Exemplary illustration of cable connection to the actuator; plug housing may
contain alternatively a terminal carrier or a crimp carrier.
Covers
A
Screws
B
Cover or similar component
Figure 35: Exemplary cover
Terminal covers and other components at the Contrac actuators
and electronic units are fastened with 4 or more screws (only 2
screws for local control panel cover).
In some cases, they are additionally sealed with a soft rubber
gasket. In order to avoid a gap between the housing and the
cover (or the other component) tighten these screws evenly
crosswise according to the order in the basic sketch in Figure 35
to get an even load.
Start with one screw and tighten it slightly. Then tighten the 2nd,
opposite screw in the same manner. Continue with the
remaining screws. Finally tighten the screws in the same order.
This will ensure a tight seal.