SKF CAHB-20 Series User manual

CAHB-20
Linear Actuator
Read this manual before installing, operating
or maintaining this actuator. Failure to follow
safety precautions and instructions could
cause actuator failure and result in serious
injury, death or property damage.
Installation, operation
and maintenance manual

1 General information .............................. 3
1.1 Information on this manual ...................... 3
1.2 Explanation of symbols . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3 Limitation of liability . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4 Warranty terms ............................... 5
1.5 Customer service.............................. 5
2 Safety ......................................... 6
2.1 Intended use ................................. 6
2.2 Responsibility of the owner and processor........... 6
2.3 Personnel requirements . . . . . . . . . . . . . . . . . . . . . . . . 7
2.3.1 Qualifications........................... 7
2.4 Specificdangers .............................. 8
2.5 Safetyequipment............................. 9
2.6 Changes and modifications on the actuator .......... 11
3 Technical data................................... 12
3.1 Operating conditions ........................... 12
3.2 Product label ................................. 12
4 Structure and function ............................ 13
4.1 Overview .................................... 13
4.2 Briefdescription.............................. 14
4.3 Special features............................... 15
4.4 Construction group description ................... 15
4.5 Connections ................................. 16
4.6 Options ..................................... 16
4.6.1 Limitswitch ............................ 16
4.6.2 Potentiometer .......................... 17
4.6.3 Thermal switch .......................... 17
5 Transport, packaging and storage................... 18
5.1 Safety information for the transport . . . . . . . . . . . . . . . 18
5.2 Transport inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.3 Return to the manufacturer...................... 19
5.4 Packaging................................... 19
5.5 Storage ..................................... 20
Contents
6 Installation and first operation ..................... 21
6.1 Installation location ............................ 22
6.2 Installation .................................. 22
6.3 Inspections prior to first operation................. 24
6.4 Connect to power supply ........................ 24
7 Operation ...................................... 25
7.1 Safety...................................... 25
7.2 Action before operation ......................... 26
7.3 Action during operation ......................... 27
7.3.1 Normal operation ........................ 27
7.4 Disengagement in case of emergency .............. 29
7.5 Action after use ............................... 29
8 Maintenance .................................... 30
8.1 Spare parts.................................. 30
8.2 Maintenanceplan............................. 31
8.3 Maintenance work............................. 32
8.3.1 Cleaning ............................... 32
8.3.2 Inspections and readings . . . . . . . . . . . . . . . . . . 32
8.3.3 Check of visual condition................... 33
8.4 Measures after completed maintenance . . . . . . . . . . . . 33
9 Malfunctions .................................... 34
9.1 Malfunction table.............................. 36
9.2 Start of operation after fixing malfunction........... 37
10 Dismantling ................................... 38
10.1 Dismantling................................. 39
10.1.1 Dismantling of CAHB-20 . . . . . . . . . . . . . . . . . 39
10.2 Disposal ................................... 39
11 Appendix ...................................... 40
2

Information on this manual1.1
This manual provides important information on how to work with
the actuator safely and efficiently.
The manual is part of the actuator, must always be kept in the
actuator’s direct proximity and should be available for the personnel
at any time. All personnel working with the actuator must read and
understand this manual before starting any work. Strict compliance
with all specified safety notes and instructions is a basic requirement
for safety at work.
Moreover, the accident prevention guidelines and general safety
precautions applicable at the place of use of the actuator must also
be complied with.
For better representation of circumstances, the illustrations used
are not necessarily to scale and may vary from the actual design of
the actuator.
Explanation of symbols and1.2
signal words
Safety Precautions
Safety precautions are identified by symbols and signal words.
These signal words indicate the severity of the hazard.
Adhere to these safety precautions and act cautiously in order to
avoid accidents, personal injuries and damage to property.
General information1
!Note!
Emphasizes useful hints and rec-
ommendations as well as information
for efficient and trouble-free operation.
Indicates a dangerous situation, which
can lead to severe personal injury or
death, if the precautionary measures
are ignored.
Warning
Indicates a dangerous situation, which
can lead to minor or moderate personal
injury or property damage, if the pre-
cautionary measures are ignored.
Caution
Indicates a dangerous situation, which
will lead to death or severe personal
injury, if the precautionary measures are
ignored.
Danger
3

Limitation of liability1.3
All information and notes in this manual were compiled under due
consideration of valid standards and regulations, the present status
of technology and our years of knowledge and experience.
The manufacturer will not be liable for damage resulting from:
disregarding this manual•
unintended use•
employment of untrained personnel•
unauthorized conversions•
technical modifications•
manipulation or removal of the screws on the actuator•
use of unapproved spare parts•
In case the actuator is customised, the actual product delivered may
be different from what is described in the manual. In this case, ask
SKF for any additional instructions or safety precautions relevant to
these actuators.
We reserve the right to make technical modifications to the actua-
tor to improve usability.
4

Warranty terms1.4
The applicable and effective warranty terms are those contained in
the manufacturer’s terms and conditions of sale.
Customer service1.5
SKF Customer Service is always available to provide technical infor-
mation and answer questions.
See the contact information for SKF Customer Service on the
back cover.
5

Safety2
This chapter provides an overview of important safety precautions
and information necessary for safe and trouble-free installation,
operation and maintenance.
Disregarding this Manual and safety precautions specified therein
may result in considerable danger and possible serious injury or
death.
Intended use2.1
The actuator has been designed and built exclusively for its intended
purpose as described in these instructions.
Any injury, damage or loss caused by violation of these instructions
will be the responsibility of the customer.
Responsibility of the owner2.2
and processor
The actuator is designed for personal use and is also used in com-
mercial applications by owner or processors.
The processor is the contracting partner of the reseller or the
manufacturer. The processor installs the actuator in a complete sys-
tem (application).
The owner of the system is therefore subject to requirements of
the Occupational Health and Safety Act.
In addition to the safety instructions in this Manual, the owner or
processor must do the following concerning these safety and acci-
Risk from misuse!
Any utilization of this actuator beyond its intended purpose may
lead to potentially hazardous situations.
Therefore:
Strictly adhere to all safety precautions and instructions in this•
manual.
Do not allow this actuator to be subjected to weather condi-•
tions, strong UV rays, corrosive or explosive air media as well
as other aggressive media.
Do not modify, retool or change the structural design or indi-•
vidual components of the actuator.
Never use the actuator outside of the technical application•
and operational limits.
Warning
6

dent prevention guidelines and environmental precautions regula-
tions applicable to the site of the system’s installation:
Inform themselves of applicable industrial safety precautions and•
determine additional hazards that arise due to the specific work-
ing conditions prevailing at the site where the actuator is installed
using risk assessment. The risk assessment must be implemented
in the form of work instructions for the actuator operation.
Confirm that the work instructions created for the system includ-•
ing the actuator satisfy current legal requirements and must alter
the instructions if they don’t.
Clearly regulate and specify the responsibilities for installation,•
operation, maintenance, and cleaning.
Ensure that all employees who deal with the actuator have read•
and understood this Manual.
Provide personnel with the required protective equipment.•
In addition, owner must train personnel at regular intervals and
inform personnel of the hazards.
In addition, owner or processors must ensure that the actuator is
in an adequate working condition. They must do the following:
Ensure that the maintenance intervals described in these instruc-•
tions are complied with.
Have all safety devices inspected regularly for function and•
completeness.
Personnel requirements2.3
Qualifications2.3.1
The following qualifications are specified for different areas of activ-
ity listed in the Manual.
An instructed person (Operator)•
has been instructed by the customer in an orientation session on
the assigned tasks and possible dangers in case of improper
behaviour.
Qualified personnel•
based on their professional training, know-how and experience as
well as knowledge of the applicable standards and regulations is
able to perform assigned work activities and to detect and avoid
possible dangers on their own.
Risk from misuse!
Improper installation, operation and maintenance can result in
serious injury, death or property damage.
Use only qualified, instructed, or trained personnel (as described
below) who have read, understand and follow these instructions.
Warning
7

A professional electrician•
based on his/her professional training, know-how and experience
as well as knowledge of the applicable standards and regulations
is able to perform work on electrical systems and to detect and
avoid possible dangers on his/her own.
The professional electrician has been trained for the special
location where he/she works and knows the relevant standards
and regulations.
Only persons who are expected to perform their tasks reliably are
permitted as personnel. Persons whose reaction capability is
impaired, e.g. through drugs, alcohol or medication, are not
permitted.
Specific dangers2.4
The following section lists the residual risks that have been deter-
mined by the risk assessment.
Heed the safety instructions listed here, and the warnings in•
subsequent chapters of this Manual, to reduce health hazards
and to avoid dangerous situations.
Danger to life caused by electric current!
Touching conductive parts causes a direct danger to life. Dam-
age to insulation or individual components can cause danger to
life.
Therefore:
In the event of damage to insulation, switch off the power•
supply immediately and have the parts repaired.
Work on the electrical system must be carried out only by•
professional electricians.
De-energize the machine for all work on the electrical system.•
Before maintenance, cleaning or repair work, switch off the•
power supply and perform lockout procedures so it cannot be
turned on again.
Do not bridge fuses or make them ineffective. When changing•
fuses, make sure you use the correct amperage.
Keep moisture away from conductive parts. If you don’t, this•
can cause short circuit.
Danger
Electric current
8

Safety equipment2.5
Integration in an emergency-stop system required (for certain
applications)
The actuator is only intended for installation into an an application
or system. It does not have its own operating control elements and
does not have an independent emergency-stop-function.
Install the actuator so that it is part of an emergency shut-off sys-
tem and can be stopped if necessary.
The emergency shut-off system has to be connected in such a
way that a disruption of the power supply or the reactivation of the
power supply after a power disruption cannot cause a hazardous
situation for persons and objects.
The emergency shut-off systems must always be freely
accessible.
Danger of injury caused by moving components!
Rotating and/or linearly moving components can cause severe
injury.
Therefore:
Do not work on or place any of your body, hands, or arms near •
moving components.
Warning Moving components
Danger due to malfunctioning safety equipment!
For safe operation, be sure all safety equipment is in good work-
ing order.
Therefore:
Always check functionality of safety equipment according to•
the maintenance plan.
Never disengage safety equipment.•
Safety equipment may never be by-passed or modified.•
Warning
!Note!
The processor decides which applications require the
installation of an emergency shut-off system.
9

The following safety features may have been installed:
In its standard version, the actuator does not feature a thermal
switch protection and can be damaged through overheating.
A thermal limit switch is an option and can be integrated in the
motor housing.
A lead screw nut converts the rotation of the gear unit into linear
motion. If an overload occurs when the actuator is operating, a ball
detent clutch will operate, thus stopping linear motion.
Thermal switch (optional)
To prevent damage from overheating, do not try to operate
actuator until its temperature has fallen below the threshold for
the switch to operate.
Caution
Overload protection
Continued operation of the clutch can result in overheating and
damage to the linear actuator. If clutch activates, switch off
power immediately.
Caution
Clutch activation can cause the limit switch to stop functioning.
If this happens, have an SKF engineer adjust it so that it again
operates properly.
Caution
10

Changes and modifications on2.6
the actuator
To avoid hazardous situations and to ensure optimal performance,
do not make any changes or modifications to the actuator unless
they have been specifically authorized by SKF.
11

Operating conditions3.1
Product label3.2
!Note!
The technical data (dimensions, weight, output, connec-
tion values etc.) can be found in the enclosed drawings and data
sheets († Appendix).
Environment
Information Value Unit
Temperature range –40 to +85 °C
Relative atmospheric humidity, maximum
(no build up of condensation)
up to 85 %
Duration (intermittent)
Information Value Unit
Maximum operating time without a break 1 Cycles
Break until next operation 3 Times of
operating time
Fig. 1 The product label provides the following
information
Identification of actuator1
Identification of actuator (Old type key)2
Power voltage3
Load capacity4
Stroke length5
Serial number6
Part number7
CE mark8
ROHS mark9
9
8
7
6
1
2
3
4
5
Technical data3
12

Overview4.1
Fig. 2 CAHB-20
Cable1
Motor part2
Gearbox3
Front hinge head4
Push tube5
Guide tube6
Rear hinge head7
1 2 3
4 5 6 7
Structure and function4
13

Brief description4.2
This actuator is to be used exclusively for installation into a dynamic
centric-compression or tensile-loaded lift.
The linear actuator consists of a motor part (3) and a linear unit
(5), connected with each other by a bayonet joint.
The actuator consists of a direct current motor with spur gear
which sets in motion a trapezoidal sliding spindle system with shaft
joint. Via the lead screw mount, the sliding spindle transforms the
rotation of the gear into a linear motion of the actuator (1).
The front hinge head (4) and the rear hinge head (7) transmit the
actuator power to both sides of the application.
Fig. 3 Overview
1 2 3
4 5 7
14

Special features4.3
Mechanical overload protection
The actuator contains a mechanical overload protection unit (clutch).
This overload protection unit will activate if the linear unit of the
actuator overloads. This activation will protect the motor and gear
unit from being damaged.
Construction group4.4
description
Motor
The motor is a 12 or 24 V DC. The motor’s shaft powers a spur gear.
The lift speed depends on the load. The motor unit is surrounded by
metal housing. The metal housing cannot be opened.
Gear unit
The spur gear is directly powered by the motor shaft which moves a
trapezoidal sliding spindle.
Linear unit
The actuator extends and retracts the push tube. The linear unit is
surrounded and protected by the guiding tube. The push tube of the
actuator is connected to the spindle with a lead screw nut.
The linear unit is connected to the motor with several screws.
These screws should not be loosened or removed.
Continued operation of the clutch can result in overheating and
damage to the linear actuator. If clutch activates, switch off
power immediately.
Caution
Clutch activation can cause the limit switch to stop functioning. If
this happens, have an SKF engineer adjust it so that it again
operates properly.
Caution
Incorrect activation of clutch could cause actuator damage.
Limit stroke of linear actuator using internal/external limit switch
or other electrical component.
Caution
15

Connections4.5
Options4.6
If not specified otherwise, the options listed below are available for
the entire series of CAHB-20 linear actuators.
Limit switch4.6.1
The limit switch makes it possible to control the stroke of the linear
unit by internal setting.
Fig. 4 CAHB-20 connections
Wires to connect1
actuator to power
supply or to an
external control.
1
If mechanical overload protection unit activates, the limit
switch can malfunction.
Contact the SKF to adjust the setting of limit switch.
Warning
16

Potentiometer4.6.2
The potentiometer provides a signal indicating the postion of the lin-
ear actuator.
There are two types of settings for the potentiometer wire.
Linear actuator with potentiometer and limit switch units: colours•
of wire are white, red and black († Fig. 11).
Linear actuator with potentiometer unit: colours of wire are white,•
green and brown († Fig. 11).
Thermal switch4.6.3
The thermal switch in the motor controls thermal overload by
switching off the motor in an emergency.
Fig. 5 Potentiometer
Retract Extend
Red
(Green)
Black
(Brown)
White
(White)
POT White Red Black
Limit + POT: (White) Green (Brown)
0 CW 10 kΩ
To prevent damage from overheating, do not try to operate
actuator until its temperature has fallen below the threshold for
the switch to operate.
Caution
17

Safety information for the5.1
transport
Transport inspection5.2
The CAHB-20 linear actuator is delivered as one packaged unit in a
box or on pallets.
Check the delivery for completeness and damage due to transport
immediately upon receipt. Send back actuator to manufacturer if it
has cracks in the casing caused during transportation.
Check completeness of delivery:
A complete actuator unit.•
If damage to the exterior of the actuator has occurred during
transport, do the following:
Do not accept delivery or do so only with reservations.•
Record scope of damage on the transport documents or on the•
bill of delivery of the shipping company.
Initiate complaint.•
Significant actuator damage can occur if not properly trans-
ported, unpacked and stored.
Therefore:
Proceed carefully during the unloading of the packaged items,•
during the delivery as well as during the transport to its final
destination and comply with the symbols and information
shown on the packaging.
Only remove the actuator from its packaging right before•
installation.
Note storage requirements for return transport to the manu-•
facturer (†Chapter Storage).
Caution Improper transport
!Note!
Report any damage as soon as it has been identified.
Damage claims can only be asserted within the transporter’s
applicable complaint period.
Transport, packaging and5
storage
18

Return to the manufacturer5.3
Proceed as follows for the return transport:
Dismantle the actuator if necessary (1 † Chapter Dismantling) .
Pack the actuator in its original packaging. Follow storage condi-2
tions († Chapter Storage).
Send to manufacturer. The address is listed on3 page 2.
Packaging5.4
For packaging
The individual packaged pieces have been packaged appropriately
according to the expected transport conditions.
The packaging is supposed to protect the individual components
from damage caused by the transport, corrosion and other damage
until they are ready for installation. Therefore, do not destroy the
packaging and only remove the actuator shortly prior to the installa-
tion. Keep packaging for possible return shipment to the manufac-
turer († Chapter 5.3).
If the packaging is to be disposed off, please adhere to the
following:
!Note!
Environmental damage due to incorrect disposal!
Packaging material consists of valuable raw materials, which,
in many cases, can be recycled.
Therefore:
Dispose of packaging material in an environmentally•
correct way.
Comply with locally applicable disposal regulations.•
Handling of packaging materials
19

Storage5.5
Pack the actuator in its original packaging for storage.
Do not store outside.•
Dry and dust-free storage.•
Keep away from any aggressive media.•
Protect from UV radiation.•
Avoid mechanical vibrations.•
Storage temperature:• –20 to 40 °C.
Relative atmospheric humidity: max.• 95% (no build up of
condensation).
For storage for longer than three months, check the general con-•
dition of all parts of the packaging on a regular basis. If necessary,
refresh or renew the conservation.
!Note!
It is possible that there are notices on the packaging con-
cerning additional storage requirements. If so, follow all
requirements.
20