WITTUR EBRA20 User manual

Braking System EBRA20
Operating instruction
Braking System EBRA20
Blatt/ sheet D7AJMGB.000
Datum/
date 23.05.2002
Stand/
version B-24.05.2005
Geprüft/
approved WAT/MZE
D7AJMGB 05.2005
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
No part of this publication may be reproduced or
translated, even in part, without prior written permis-
sion from WITTUR GmbH.
Änderungen vorbehalten!
We reserve the right to make alterations with respect
to the specifications and figures in this manual.
Subject to change without notice!
WITTUR GmbH
Sowitschstrasse 1 • A-3270 Scheibbs, Austria
Tel. [phone] •Fax [phone]
http://www.wittur.at •E-Mail: [e-mail]

Contents Page
1 General information prior to installation
1.1 Description and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D7AJMGB.002
1.2 Liability and guarantee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D7AJMGB.003
1.3 Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D7AJMGB.003
1.4 Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D7AJMGB.004
1.5 Advice for when working on safety components . . . . . . . . . . . . . . . . . . . . . . .D7AJMGB.004
1.6 Content of supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D7AJMGB.005
2 Name plate, designation, identification . . . . . . . . . . . . . . . . . . . . . . . . . . . .D7AJMGB.006
3 Installation
3.1 Installation of EBRA20 to the car frame crosshead beam . . . . . . . . . . . . . . . .D7AJMGB.007
3.2 Preparations and installations in the machine room . . . . . . . . . . . . . . . . . . . .D7AJMGB.009
3.3 Electrical installation of the braking system . . . . . . . . . . . . . . . . . . . . . . . . . . .D7AJMGB.009
4 Adjustment tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D7AJMGB.010
5 Function testing
5.1 Static functions test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D7AJMGB.011
5.2 Dynamic functions test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D7AJMGB.012
5.2.1 Visual checks after a braking test . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D7AJMGB.012
6 Maintenance, inspection and repair
6.1 Maintenance and inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D7AJMGB.013
6.1.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D7AJMGB.013
6.1.2 Cleaning of guide rails . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D7AJMGB.013
6.1.3 Returning tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D7AJMGB.014
6.2 Maintenance and inspection check list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D7AJMGB.014
6.2.1 Checking and changing the brake shoe . . . . . . . . . . . . . . . . . . . . . . . .D7AJMGB.015
6.2.2 Checking and changing the brake fork sliding elements . . . . . . . . . . .D7AJMGB.015
6.2.3 Checking and changing the car sliding shoe . . . . . . . . . . . . . . . . . . . .D7AJMGB.016
6.2.4 Changing the battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D7AJMGB.016
6.3 Carrying out repairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D7AJMGB.017
6.4 Fault finding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D7AJMGB.017
6.5 Rescuing trapped passengers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D7AJMGB.017
6.5.1 Power ON and the OSG switch has been switched OFF . . . . . . . . . . . .D7AJMGB.019
6.5.2 Power OFF, but the OSG switch has not been switched OFF . . . . . . .D7AJMGB.020
6.5.3 Car cannot be moved following 1 and 2 . . . . . . . . . . . . . . . . . . . . . . .D7AJMGB.020
6.6 Spare parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D7AJMGB.021
Blatt/ sheet D7AJMGB.001
Datum/
date 23.05.2002
Stand/
version B-24.05.2005
Geprüft/
approved WAT/MZE
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Änderungen vorbehalten! Subject to change without notice!
Braking System EBRA20
Operating instruction

1.1 Description and functions
The EBRA20 guide rail brake is used as an ascend-
ing car over speed protection safety device.
EBRA20 is used when the motor-brake effects not
direct to the traction sheave or to the axle of the
traction sheave quite near of this. It acts onto the
car guide rail an reduces the car speed according
to the regulations (EN81-1:1998 9.10.4). The brake
operates with two spring loaded brake shoes an is
opened by an electro magnetic coil. The max.
retardation is 1.0 g.
The brake is installed above the overhead beams of
the sling and it replaces the sliding guide shoe of
the car (the guide shoe of the car is integrated to
the brake body - to be used with sliding guide
shoes only).
EBRA20 is a stand alone braking system which only
needs the tripping information (over speed gover-
nor switch) from the elevator.
The EBRA20 may be used for electrical operated
passenger an goods lifts according EN81-1. The
system does not substitute the safety gear for
down direction.
The settings are carried out in the factory (accord-
ing to the elevator data) an sealed.
The operating range is defined as follows:
• Max. nominal speed 2.0m/s
• Nominal load Q 240 - 2000kg
• Width of guide rail head 7 - 19mm
• Max. guide forces during normal running
F = 2000N
• Weight of one EBRA20 30kg
• Power supply 230 VAC
1. Brake switch
2. Connection cable
3. Lubricator cup
4. Sliding element
5. Brake shoe
6. Sliding guide shoe
7. Base plate
Blatt/ sheet D7AJMGB.002
Datum/
date 23.05.2002
Stand/
version 23.05.2002
Geprüft/
approved WAT/MZE
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Änderungen vorbehalten! Subject to change without notice!
1 General information prior to installation
Braking System EBRA20
Operating instruction
5
6
7
2
1
3
4

Braking System EBRA20
Operating instruction
1.2 Liability and guarantee
This instruction handbook is written for people
who are familiar with lift servicing and installa-
tion. Sufficient knowledge of lifts is essential.
WITTUR accept no responsibility for damage
caused by improper handling, or for damage
caused as a result of actions other than those stat-
ed in these operating instructions.
The WITTUR guarantee may be voided if parts
other than those described in these instructions
are installed.
Unless stated otherwise, the following are not per-
missible due to technical safety reasons:
• The use of components other than those
installed
• Carrying out modifications, of any kind on the
brake system
• Installing two different brake heads with dif-
ferent index numbers together
• Destruction of the lead seal
• Combining different component types
• Installing braking systems intended for other
employment than that stipulated
• Carrying out faulty or improper maintenance
or inspection checks
• Using unsuitable accessories, spare parts or
operating material which has neither been re-
leased by the WITTUR Company nor consists of
original WITTUR spare parts
1.3 Safety precautions
WITTUR machine installation or repair engineers
are chiefly responsible for the safe operation of
machinery.
It is essential to comply with and keep abreast of
all safety rules and legal obligations in order to
avoid personal / product damage during installa-
tion, maintenance and repair work.
Important safety advice and danger warnings are
emphasized with the following symbols:
General danger warning
High danger risk warning (i.e. crushing
edge, cutting edge etc.).
Risk of damage to machinery parts (i.e. due
to incorrect installation, or such like).
Important information sign
These operating instructions belong with the
whole installation and must be kept in a safe place
at all times (i.e. machine room).
The proper assembly and installation of WITTUR
brake systems requires correspondingly well
trained fitting engineers. The responsibility of
training lies with the company appointed to carry
out the work.
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Änderungen vorbehalten! Subject to change without notice!
Blatt/ sheet D7AJMGB.003
Datum/
date 23.05.2002
Stand/
version 23.05.2002
Geprüft/
approved WAT/MZE

Braking System EBRA20
Operating instruction
Before starting installation work:
Only properly trained personnel may carry
out work, or be allowed access to the
installation site.
- Attach safety devices to guard against falling
(platform or harnesses)
- Cover any floor openings
- Secure installation tools or objects against
accidental falling
- Lift shaft openings should be cordoned off
and suitable warning signs should be erected
when working in shaft openings
- Work involving electrical equipment should
only be carried out by an electrical engineer or
qualified personnel.
1.4 Preparation
Before beginning installation work it is in your
own interest to ascertain the constructional and
spatial conditions. Where (workshop or on site)
and when which installation operations can or
must be carried out. It is recommended therefore,
taking into account all the given circumstances, to
plan the various operational sequences in advance,
rather than carrying them out prematurely and in
an unconsidered manner.
On receipt of the delivery, the goods or compo-
nents should be checked for correctness and com-
pleteness with the order sheet.
The following should be checked also:
- that the factory and order number correspond
- that the details on the name plate correspond
to those on the order
- the elevator speed
- the width and type of guide rail used
- the nominal load (Q)
1.5 Advice for when working on
safety components
The Brake system EBRA20 is classified as safety
components. It is most important that the stan-
dards and guidelines described in this section be
complied with as well as those given in the rest of
this operating manual.
These instructions, and especially the sec-
tion on safety precautions, should be read
and fully understood before work begins.
Safety devices require special attention. It is com-
pulsory that they function perfectly to ensure
danger free installation operation.
Safety devices that can only be adjusted after
installation should be done so immediately after
installation.
Operation of safety devices installed ex-works
must be tested immediately.
If it is necessary to disassemble a safety device
during servicing or repair, they should be reassem-
bled and comply with the required tests, as soon as
the work has been carried out.
Blatt/ sheet D7AJMGB.004
Datum/
date 23.05.2002
Stand/
version 23.05.2002
Geprüft/
approved WAT/MZE
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Änderungen vorbehalten! Subject to change without notice!

Braking System EBRA20
Operating instruction
1.6 Content of supply
After delivery, check the brake system for damage
and for full delivery of parts. The content of sup-
ply covers:
- Operating instructions manual
- One pcs. EBRA20 (Q<1000kg) or
two pcs. EBRA20 (1000<Q<2000kg)
pre-adjusted and sealed at the factory
- Electrical interface (optional):
• Controller box (incl. electronics
and battery)
• Electronics (separate)
• Battery (separate)
- Mechanical interface (optional):
• Adapter plate to car frame
• Fixing screw-packages
Blatt/ sheet D7AJMGB.005
Datum/
date 23.05.2002
Stand/
version 23.05.2002
Geprüft/
approved WAT/MZE
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Änderungen vorbehalten! Subject to change without notice!
Braking System EBRA20
Operating instruction
Braking System EBRA20
Blatt/ sheet D7AJMGB.000
Datum/
date 23.05.2002
Stand/
version 23.05.2002
Geprüft/
approved WAT/FLE
D7AJMGB 05.2002
THELMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
No part of this publication may be reproduced or
translated,even in part, without prior written permis-
sion fromWITTUR GmbH.
Änderungenvorbehalten!
Wereserve the right to make alterations with respect
to the specifications and figuresin this manual.
Subjectto change without notice!
WITTUR GmbH
Sowitschstrasse 1 • A-3270 Scheibbs, Austria
Tel.[phone] •Fax [phone]
http://www.wittur.at•E-Mail: [email protected]
Controller box
Electronics
Battery

The EBRA20 identification indicator is located on
the top of the brake connection box.
It gives following data:
• Type term
• Serial number
• Elevator number
• Tripping speed
• Nominal load
Number of brakes (1... Q<1000kg)
(2... 1000<Q<2000kg)
• Rail head width
• Spring adjustment dim. (B)
The EBRA20 is preset in the factory and should not
be adjusted on site conditions.
Spring length (B) is measured when EBRA20 is on
the rail and braking and should be +/-1 mm from
the value given.
Blatt/ sheet D7AJMGB.006
Datum/
date 23.05.2002
Stand/
version 23.05.2002
Geprüft/
approved WAT/MZE
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Änderungen vorbehalten! Subject to change without notice!
2 Name plate, designation, identification
Braking System EBRA20
Operating instruction
Type test designation
and CE-label
Tripping speed vmax = (m/s)
Nominal load
Q = (kg)
Serial number
Order number - Elevator number
(refer to delivery or order sheet)
Typ termDate of manufacture

Braking System EBRA20
Operating instruction
3.1 Installation of EBRA20 to the car
frame crosshead beam
The installation could be done during car frame
assembling (refer to chapter crosshead beam
installation) or also afterwards if the elevator is to
be modernized.
Check that there is two spare wires in trav-
elling cable (A) - otherwise install a new
travelling cable.
(1) Fix car sling in position to guide (if modern-
ization)
(2) Remove the old sliding shoe of the car (B) and
possible other fixings above the car frame
crosshead beam
(3) Fix the adapter plate(s) (C) to the crosshead
beam - drill fixing holes ø14mm to the beams
if required.
Take care of tightening torque
Screw M12: 80Nm
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Änderungen vorbehalten! Subject to change without notice!
3 Installation
Blatt/ sheet D7AJMGB.007
Datum/
date 23.05.2002
Stand/
version 23.05.2002
Geprüft/
approved WAT/MZE
(1-3)Screw package
601775G04
B
C

(4) Fix the EBRA(s) (D) on the adapter plate
There are two EBRA20 units when nominal
load of the lift is above 1000kg.
Take care of tightening torque
Screw M12: 80Nm
(5) Connect the connection cables from each
brake unit to the car roof terminal box (E).
The brake switch contact is wired in series
with the safety gear contact in lift safety
circuit.
Blatt/ sheet D7AJMGB.008
Datum/
date 23.05.2002
Stand/
version 23.05.2002
Geprüft/
approved WAT/MZE
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Änderungen vorbehalten! Subject to change without notice!
Braking System EBRA20
Operating instruction
(4)
(5)
Screw package
601775G04
D
E
A

Braking System EBRA20
Operating instruction
Refer also to chapter 3.3 Electrical installa-
tion of the braking system.
(1) Change the whole overspeed governor (OSG)
and the cable (A) if it is not equipped with a
switch with two NC-contacts (F).
(2) Install the controller box (B) to the machine-
room wall and connect the cables (C) from the
box to the controller cabinet.
The following conditions / interfaces are required
to operate the EBRA20:
• Overspeed governor contact switch with
two NC-contacts
• 230 VAC power supply including 6 A fuse
• two strands in travelling cable
• Brake switch of EBRA20 to be connected in
safety circuit
Blatt/ sheet D7AJMGB.009
Datum/
date 23.05.2002
Stand/
version 23.05.2002
Geprüft/
approved WAT/MZE
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Änderungen vorbehalten! Subject to change without notice!
Work involving electrical equipment
should only be carried out by an electrical
fitter or qualified personnel.
Before carrying out work, switch off all
voltage to installation equipment.
Take note of the following when laying the
connection cable:
• that the single polarity cables have dou-
ble insulation
• the use and laying of cables is governed
by the EMC
The braking switch contact opens the lift
installation’s remotely controlled safety
circuit.
3.3.1 EBRA20 connection cable
Refer to chapter 4 Adjustment task
(1) Connect the cables (A) in the controller cabi-
net to over speed governor (OSG). Make the
connections of power supply for the EBRA20
magnet through the travelling cable (D) and
230V power supply for the board (E).
If the car light supply is used the wires
should be marked to have electricity when
the main supply of the lift is switched OFF.
3.2 Preparations and installations in the machine room
3.3 Electrical installation of the braking system

230VAC
123456
1234567
230VAC
Liftsafety
Circuit1,2
1
2
3
4
5
6
30VAC
230VAC
1
2
3
4
5
6
12
46
ControllerCabinet
+
+
-
-
ControllerCabinet
10
10
10
10
10
OSG
1
6
7
9
Liftsafety
CircuitP52
TerminalBox
4
1
2
5
6
am7423b
A
B
C
J
H
G
F
I
E
D
OSG
12
46
230VAC
30VAC 12
34
5
6
213456
123456
21
3
4567
1
2
3
4
5
6
Lift safety
circuit
Controllerl cabinet
Travelling cable
Terminal
box
1
2
4
5
6
8
Lift safety
circuit
(1) Close the overspeed governor contact switch
(F) and put the power ON for EBRA20 230VAC
(G). The magnet closes and the brake opens.
(2) Remove the transport clamp (yellow) (H) from
the back side of the magnet (at the car roof)
(3) Check that EBRA20 magnet releases when
overspeed governor contact switch (F) is
opened and closes if after closing the
Overspeed governor contact switch the power
supply 230VAC (G) is switched OFF and ON.
Switching the power off, resets the time
circuit on the board.
Do not open the overspeed governor con-
tact switch (F) shortly after recycling the
EBRA20 (G) because there is 200VDC over
the overspeed governor contact switch
contacts and they may be burned if
opened. The voltage drops to about 30 VDC
in 2 seconds.
If there is battery backup:
(4) FIRST Switch battery OFF (J) then connect the
plugs (I) if loosen and switch (J) ON. Then
check that the battery voltage is about 24VDC
when the 230VAC power supply (G) is OFF.
Otherwise switch on the 230VAC (G) ON and
wait until batteries are charged.
(5) When battery voltage is about 24VDC, check
that the EBRA20 remains open even if the
power is cut from the 230 AC supply (G).
Otherwise, please contact us at WITTUR for
technical support.
(6) Leave the battery (J) ON after testing.
Blatt/ sheet D7AJMGB.010
Datum/
date 23.05.2002
Stand/
version B-24.05.2005
Geprüft/
approved WAT/MZE
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Änderungen vorbehalten! Subject to change without notice!
4 Adjustment tasks
Braking System EBRA20
Operating instruction

Braking System EBRA20
Operating instruction
Operational reliability of the installation is assured.
The quality and function of individual components
are subject to thorough inspection and is checked
before dispatch from our works. The brake system
should undergo an operational test before com-
missioning or before possible inspection from a
technical institute.
First test run after installation
Before the first test run:
The protective coating of grease is to be
carefully removed from the guide rails!
Clean the guide rails!
The cleaning of the guide rail must be done
with a disc brake cleaner or a similar fluid.
It is not allowed to do mechanical cleaning
like grinding. If the surface cannot be
cleaned properly contact the manufacturer.
Clear all people and objects from the lift
shaft before commencing the test run
Risk of crushing injuries!
The entire lift travel path should be slowly trav-
elled (in inspection mode) before the functions
tests. Attention should be paid to the clearance of
all fastened parts, especially with regards to the
guide brackets/safety gear devices. Find and
remove any protruding bolts or other dangerous
restrictions well in advance.
Preparations before tests:
The EBRA20 can only be used with sliding
guides shoes. Therefore a thin coating of
the guide rail oil is to be applied to the
guide rails.
The lubrication oil may not include high
pressure additives.
5.1 Static functions test
The function of the safety gear is to be checked
with empty car before the real brake system test is
performed.
The first test should be done as follows:
• Move the car (the car must be empty) to
ground floor
• Switch off the EBRA20 so it brakes the eleva-
tor
• Switch off the power of the elevator
• Release manually the brake of the drive
• The car may move up to 100 mm upwards
• The car must stop
If the retardation is not correct the
EBRA20 must be replaced (please contact
WITTUR).
The real test can be performed when the
above mentioned tests are ok.
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Änderungen vorbehalten! Subject to change without notice!
5 Function testing
Blatt/ sheet D7AJMGB.011
Datum/
date 23.05.2002
Stand/
version B-24.05.2005
Geprüft/
approved WAT/MZE

Braking System EBRA20
Operating instruction
5.2 Dynamic functions test
Nobody should be in the lift car or on the
car roof when carrying out test runs or
functions tests!
Test procedure according to EN81-1: 1998
appendix (D) point (n) page 73:
The test can be made while the empty car is
ascending at not less than rated speed, using only
EBRA20 for braking.
The car can be driven upwards using the motor
and when the nominal speed is reached the
EBRA20 is activated by the OSG switch (F) and the
motor brake is kept open manually during the
braking.
The EBRA20 can be actuated as well by switching
OFF the battery (J) and then the power supply (G).
Do not open the overspeed governor con-
tact switch (F) shortly after recycling the
EBRA20 (G) because there is 200VDC over
the overspeed governor contact switch
contacts and they may be burned if
opened. The voltage drops to about 30 VDC
in 2 seconds.
5.2.1 Visual checks after a braking test
After each test or activation of the EBRA20 check
that there are no defects that can impair the nor-
mal run of the elevator.
Go onto the car and check following items:
- existence of sliding inlays
- existence of brake lining
- visual defects of brake system parts
- friction marks
- defects on the EBRA20 body
If there is any defect the safety gear must
be replaced!
Change sliding inserts or brake lining if
necessary.
Blatt/ sheet D7AJMGB.012
Datum/
date 23.05.2002
Stand/
version 23.05.2002
Geprüft/
approved WAT/MZE
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Änderungen vorbehalten! Subject to change without notice!

Braking System EBRA20
Operating instruction
Blatt/ sheet D7AJMGB.013
Datum/
date 23.05.2002
Stand/
version B-24.05.2005
Geprüft/
approved WAT/MZE
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Änderungen vorbehalten! Subject to change without notice!
6.1 Maintenance and inspection
The braking system EBRA20 is basically mainte-
nance free. The whole installation is designed so
that no large maintenance operations have to be
carried out during damage free operation of the
installation.
Inspection checks must be carried out at regular
intervals (minimum twice a year with each service)
to guarantee safe operation. Alterations, damage
or other irregularities should be reported, and
repaired if possible. Frequent servicing and control
checks not only make operation of the installation
safer, but also ensure long and reliable service life.
It is recommended that control checks and servic-
ing be carried out before legally prescribed func-
tional tests (e.g. before TÜV tests).
The lift installation must be immediately
taken out of use should any damage or
irregularities arise which could possibly
impair operational safety.
Please contact us at WITTUR if you have
any problems or queries.
Maintenance work should be expertly car-
ried out with utmost care in order to guar-
antee safe installation operation.
6.1.1 General
The EBRA20 can only be used with sliding
guides shoes. Therefore a thin coating of
the guide rail oil is to be applied to the
guide rails.
The lubrication oil may not include high
pressure additives.
6.1.2 Cleaning of guide rails
Any dust or dirt on the guide rails can have influ-
ence to the friction between the guide rail and the
braking system. This means that the guide rails
must be cleaned carefully whenever the dirt
becomes visible on the guide rails or in minimum
once per year.
As cleaning fluid a disc brake cleaner or a
similar fluid should be used.
Mechanical cleaning like filing, grinding is
not permitted.
6 Maintenance, inspection and repair
Tab. 1: Lubricant requirements
Operation temp.
[°C]
-20 ... +5
Viskosity
68 cSt/40°C
-5 ... +35 ISO VG-320
+30 ... +50 ISO VG-460

Braking System EBRA20
Operating instruction
6.1.3 Returning tests
Periodical examinations and tests shall not be
more stringent than those required before the ele-
vator was first put to service. Thus if the tests are
made they shall be carried out using reduced
speed to avoid causing exessive wear or impose
stresses likely to to reduce the safety of the eleva-
tor.
The operation of the EBRA20 brake can be tested
following the instructions in chapter 5 Function
testing.
And the static force produced by the brake just by
opening the motor brake when EBRA20 is braking
and checking that the car does not move.
The reset of the braking system must be
done by an expert person.
Each test has to be documented and a copy of the
test report should remain in the elevator book.
6.2 Maintenance and inspection
check list
To indicate when wearing parts of EBRA20 should
be changed use following list:
•Brake shoes are nominally
12mm thick and can be used to
thickness of 11.8mm.
Thickness should be checked
after every five emergency
braking (refer to chapter 6.2.1).
•Sliding elements are nominally
8.5mm thick and can wear to
7.5mm. If the thicknes is less
then 7,5 mm brake shoe touches
the rail and makes noise (refer to
chapter 6.2.2).
The burrs coming from the rail in braking
may stuck to the sliding element thus they
have to be cleared after a braking if the
brake makes noise.
•Car sliding shoes should be
changed as normal guide shoes
after the clearance between the
rail and shoe is above 2mm (refer
to chapter 6.2.3).
•Battery (optional) is changed every 2.5 years
or if U < 10V (refer to chapter 6.2.4).
• Check state of EBRA20 brake and neighboring
components for damage, deformation or
heavy oxidation (rust)
• Check brake switch for function
• Clean system if dirt has built
Blatt/ sheet D7AJMGB.014
Datum/
date 23.05.2002
Stand/
version B-24.05.2005
Geprüft/
approved WAT/MZE
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Änderungen vorbehalten! Subject to change without notice!
12 12
8,5
8.5
3
a
kk

6.2.1 Checking and changing the brake shoe
(1) Put a clamp to the brake magnet to ensure
that the brake magnet will not release during
the brake shoe changing process
(2) Remove the Lubricator cup
(3) Open the M5 screws which are used to fix the
brake shoes
(4) Turn the brake shoes carefully out so that a
M5 hole comes visible and put some assisting
pin to the hole
DO NOT DROP the brake shoes to the shaft
as they are frag-ile hardened steel and may
be broken if dropped.
(5) Take the brake shoe out from the cutting it is
positioned in and check its condition. Change
if needed
6.2.2 Checking and changing the brake fork
sliding elements
(1) Push the upper sliding element downwards
along the guide rail and the lower one
upwards
(2) Take the parts out for examination by fingers
(3) Change if needed
Blatt/ sheet D7AJMGB.015
Datum/
date 23.05.2002
Stand/
version 23.05.2002
Geprüft/
approved WAT/MZE
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Änderungen vorbehalten! Subject to change without notice!
Braking System EBRA20
Operating instruction

6.2.3 Checking and changing the car sliding
shoe
(1) Remove the M6 screws holding the slide shoe
and the oil cup fixing
(2) Remove the lubricator cup with the fixing part
(3) Lift the guide shoe up for examination
(4) Change if needed
6.2.4 Changing the battery
(1) SWITCH OFF the battery (2) and the power of
EBRA20 (3) before changing the battery
NOTE! There may be 230 V in wires against
the earth.
(2) Remove the fixing and change the battery (1)
Blatt/ sheet D7AJMGB.016
Datum/
date 23.05.2002
Stand/
version B-24.05.2005
Geprüft/
approved WAT/MZE
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Änderungen vorbehalten! Subject to change without notice!
Braking System EBRA20
Operating instruction
23
1
Modernisation
New installation

Braking System EBRA20
Operating instruction
6.3 Carrying out repairs
As a rule, the safety gear should neither be
taken apart or altered in any other way
(sealants, sealing wax). This also applies to
repairs. An exception to this is the electri-
fication (e.g. due to reconstruction work
etc). Condition for this, is that the process
is carried out properly and functioning is
in no way compromised.
It is forbidden to replace faulty or worn
parts of the EBRA20 brake yourself.
The reasons are:
• conditions of liability and technical safety
• only original replacement parts may be
installed (these are available from manufac-
turer only).
Operation of the system without the safe-
ty gear, even for short periods of time, is
forbidden.
Permitted repair work:
Repairs to the braking system which do not direct-
ly affect the brake (e.g. electrification, sliding ele-
ments) must be carried out locally. In other words,
all procedures involved in initial installation are
also included in the repairs and maintenance
schedule.
Such repair work in the safety system must, of
course, be carried out correctly and with utmost
care, in order to guarantee long-term safe opera-
tion of the system.
Please contact WITTUR if for any reason
something is unclear, or you encounter
damage that cannot be repaired with the
help of these instructions.
6.4 Fault finding
Elevator does not move, even if EBRA20 is open
• Check that the contact (1) is closed when the
EBRA20 is open
EBRA20 does not open, even if the power is ON
• Check the outputs from EBRA control (refer to following sketch):
Switching the power ON for X1
Outputs:
X2: 230 VAC; X3: 30 VAC; X5: 200 VDC (which drops to ~30 VDC 2 seconds after power ON
switching); X6 : ~30 VDC.
Blatt/ sheet D7AJMGB.017
Datum/
date 23.05.2002
Stand/
version B-24.05.2005
Geprüft/
approved WAT/MZE
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Änderungen vorbehalten! Subject to change without notice!
1

Blatt/ sheet D7AJMGB.018
Datum/
date 23.05.2002
Stand/
version B-24.05.2005
Geprüft/
approved WAT/MZE
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Änderungen vorbehalten! Subject to change without notice!
Braking System EBRA20
Operating instruction
6.5 Rescuing trapped passengers
Rescuing trapped passengers in exceptional situa-
tions is somewhat different in elevators where
EBRA20 is used, than it is in traditional traction
elevators without any ascending car overspeed
protection.
The main difference is, that the EBRA20 is an inde-
pendent brake which is released in overspeed situ-
ations and reset separately by the OSG switch and
its own reset button.
Rescuing trapped passengers might become neces-
sary under the following conditions where EBRA20
is actuated and braking and the elevator car can-
not be moved following the standard procedures
given for elevators without this additional brake.
ALWAYS, check first has the OSG switch
been operated i.e. has the car run over-
speed.
(1) Power ON and the OSG switch has been
switched OFF. The car has run overspeed (refer
to chapter 6.5.1)
(2) Power OFF, but the OSG switch has not been
switched OFF (refer to chapter 6.5.2)
(3) Car cannot be moved following 1 and 2
(Power OFF) and the OSG switch has been
switched OFF. (Two or more independent fail-
ures at the same time, UNEXPECTED) (refer to
chapter 6.5.3)
Travelling cable
Fuse
X1
L
N
X2
L1
N1
X5
+
-
COIL
X6
+
-
X3
N
L
UVAC
BAT.
BN
BU
BK
WH-BK
24 V
+
OSG Switch
30VAC
bB
230 VAC
6A
220/30 VAC
50W
Aa
Connection box
Control
electronics
Machine room
Car roof
Fuse
~
N
For safety
Circuit contact
Cable from Brake to
car roof terminal box
WH-BK
For coil
GN-YE
WH-BK
BK
BU
BN
GN-YE
BK
BU
BN
4
5
6
S07VV-R5G0.75
1
2
3
~
+
~
-
L
Guide rail
brake
Lift safety
circuit
Switching the power OFF for X1
Outputs:
X2: 0 V; X3: 0 V; X5: ~24 V DC
(0V with no battery);
X6: ~24 VDC (0V with no battery)

6.5.1 Power ON and the OSG switch has been
switched OFF. The car has run overspeed
• Inform the passengers that you are about to
let them out and they must not try to do any-
thing by themselves
• Switch OFF the possible battery backup (1)
from the EBRA20 control
• Reset the OSG switch (2) - OSG is accessible
(e.g. in the machine room)
If the OSG is not accessible (e.g. is placed in
the shaft head room), bridge in the con-
troller cabinet ONLY the normally closed
contact of the OSG switch (2) which is put
in series with the EBRA20 magnet via the
travelling cable (attention: do NOT bridge
the normally closed contact from the safe-
ty circuit).
• Recycle the power supply (3) in order to get
EBRA20 open
KEEP FINGERS on the switch so that the
brake can be actuated by switching the
power off if the elevator car rushes up or
down
• If the car does not move even if the EBRA20
brake is open follow the rescue plan given for
that specific elevator type to get the car to the
door zone
Normally: open the motor brake and turn
the hand wheel.
Resp. if the elevator is equipped with
recall-drive:
drive that far to enable pas-
senger rescuing through car doors.
• Open the door and let the passengers come
out
230VAC
123456
1234567
230VAC
Liftsafety
Circuit1,2
1
2
3
4
5
6
30VAC
230VAC
1
2
3
4
5
6
12
46
ControllerCabinet
+
+
-
-
ControllerCabinet
10
OSG
1
6
7
9
Liftsafety
CircuitP52
TerminalBox
4
1
2
5
6
8
am7423b
2
3
41
OSG
12
46
230VAC
30VAC 12
34
5
6
213456
123456
21
3
4567
1
2
3
4
5
6
Lift safety
circuit
Controller Cabinet
Travelling Cable
Terminal
box
1
2
4
5
6
8
5
Lift safety
circuit
6
Blatt/ sheet D7AJMGB.019
Datum/
date 23.05.2002
Stand/
version B-24.05.2005
Geprüft/
approved WAT/MZE
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Änderungen vorbehalten! Subject to change without notice!
Braking System EBRA20
Operating instruction