cemp DB 30 Quick start guide

Electric Motors with brake
Additional use and maintenance instructions
Industrieweg 16
NL-3881 LB Putten
T [phone]
F [phone]
E [email protected]

19
ENGLISH
Page
1. General information ............. 20
2. Description of the product ....... 21
2.1 General operation . . . . . . . . . . . . . . . . 21
2.2 Construction method for the brake
motors sizes 71÷160 . . . . . . . . . . . . . 24
2.3 Construction method for the brake
motorssize63 .................. 24
2.4 Construction method for the brake
motors sizes 180÷315 . . . . . . . . . . . . 25
2.5 Manual release 71÷160
(optional on request) . . . . . . . . . . . . . 25
2.6 Manual release 180÷315
(optional on request) . . . . . . . . . . . . . 26
3. Installation ..................... 26
3.1 Nameplate
(information on the brake) . . . . . . . . . 26
3.2 Electrical connections . . . . . . . . . . . . 27
3.3 Connection for auxiliary devices . . . . 27
3.4 Manual release
(optional on request) . . . . . . . . . . . . . 27
4. Maintenance ................... 28
4.1 ntroduction .................... 28
4.2 Dismantling and re-assembling
the brake cover enclosure
motors63÷160 ................. 28
4.3 Adjusting the braking torque
motors63÷160 ................. 28
4.4 Adjusting the air gap
motors63÷160 .................. 29
4.5 Changing the brake disc
motors63÷160 ................. 30
4.6 Adjusting the braking torque and
replacing the braking unit and/or its
parts for motors 180÷315 . . . . . . . . . 31
4.7 Adjusting the air gap of
motors 180÷315 . . . . . . . . . . . . . . . . . 32
5. Troubleshooting ................ 33
BV 301 Number: UM-F2
GB CONTENTS

20
ENGLISH
1. General information
The use and maintenance instructions refer to
flameproof motors with brake, Series D 63÷315
and Series H 71÷160.
This manual is an addition to the basic “Rotating
electric machines - low voltage” manual and the
“Safety nstructions” manual and must therefore be
referred to along with these when installing, starting
up, and carrying out maintenance on the motor.
Safety hazards can only be avoided if the user fol-
lows all warnings and instructions in this manual.
The user is to specifically ensure that:
• The motors are used according to their technical
specifications.
• The motors are in perfect condition when used
and maintenance is carried out at regular intervals.
• The instructions are always readily available.
• nstallation, start-up, maintenance, and repairs are
only carried out by qualified, authorised personnel.
Table 1A - Motor ranges
Accidents due to errors during operation
and maintenance may cause serious injury to
people and extensive damage to the equipment.
The motors are supplied ready for use, according to
the specifications indicated in the order.
f any braking torques, work cycles, or inertias differ
from those indicated in the order are required, please
contact us.
Noise level: Motors with brake produce noise when
the brake opens and when starting up. The noise
level depends on the installation conditions and the
air gap value.
Version
Motor type
Ex d IIB Ex de IIB Ex d IIC Ex de IIC
Three-phase, 1-speed
(2, 4, 6, 8 poles) unventilated or
forced ventilation
DB 30 DB 35 DC 30 DC 35
Single speed, three-phase,
self-ventilated (2, 4, 6, 8 pole) HB 30 HB 35 HC 30 HC 35
Two speeds, three-phase,
(2/4, 4/8 pole) unventilated or
forced ventilation
DB 20 DB 25 DC 20 DC 25
Two speeds, three-phase,
self-ventilated (2/4, 4/8 pole) HB 20 HB 25 HC 20 HC 25
Motors for lifting
Single speed, three-phase,
(6 pole) unventilated or forced ventilation DB 50 DB 55 DC 50 DC 55
Single speed, three-phase,
self-ventilated (6 pole) HB 50 HB 55 HC 50 HC 55
Two speeds, three-phase,
(2/8, 4/12, 4/16 pole) unventilated or forced
ventilation
DB 50 DB 55 DC 50 DC 55
Two speeds, three-phase,
self-ventilated (2/8, 4/12, 4/16 pole) HB 50 HB 55 HC 50 HC 55

21
ENGLISH
2. Description of the
product
The D Series and H Series motors have a built-in
brake inside the enclosure. The motor and brake are
considered as a single piece of equipment and are
covered by a single certificate.
The brakes are designed to work dry.
When the motor is stopped, the brake provides the
braking torque indicated on the nameplate.
The brake is housed in a specific enclosure made up
of a brake holder shield
ct , a brake cover enclosure
dt and only for motors 180÷315 (by the brake enclo-
sure shield ds bolted together.
The brake holder shield shuts off the motor enclosure
and allows the shaft to pass through it
br .
n the case of self-ventilated motors (H Series) the
shaft protrudes from the brake cover enclosure
through a flameproof joint. A fan is applied to the
protruding part of the shaft cr .
The brake enclosure and the fan are protected by the
fan cover bq .
The self-ventilated version is not available for size 63.
When the brake is powered, the electro-magnet dp
attracts the mobile armature dl . As this moves the
springs are compressed releasing the brake disc dm ,
so that the motor shaft, to which the brake disc is
coupled, is able to turn freely.
When the voltage to the brake is disconnected the
electro-magnet is deactivated and the springs push
the mobile armature against the brake disc.
The brake disc causes friction on the brake holder
shield and the mobile armature stops the shaft rotat-
ing.
2.1 General operation
Table 2A - Component classification
Note: spare parts indicated with numbers from 48 to 51 are not listed in the catalogue, but only in this publi-
cation.
Component
number Description Shown in figure
16 Fan cover (cowl) 2A
17 Shaft 2A - 2B - 2C - 2D
27 Cooling fan 2A
29 Brake holder back shield 2A - 2B - 2D - 2E
31 Mobil armature 2A - 2B - 2D - 2E
32 Brake disc 2A - 2C - 2D - 2E
35 Electro-magnet 2A - 2B - 2C - 2D - 2E
36 Pinion (toothed hub) 2A - 2B - 2C - 2D - 2E
38 Brake shield 2B - 2E
39 Brake cover enclosure 2A - 2B - 2E
48 Fixing screws (studs) 2C - 2D - 2E
49 Screws (nuts) to adjust the braking torque 2C - 2D - 2E
50A-50BScrews (nuts) to adjust the air gap 2C - 2D - 2E
51 Springs 2C - 2D - 2E

22
ENGLISH
br ctdq dm dl dp dt
br ctdq dm dl dp dt cr bq
Fig. 2A
Series D
63÷160
Series H
71÷160

23
br ct
dq
dt dm
dl dp
dm
ds
dqdl dp
br ctdt ds bq cr
ENGLISH
Fig. 2B
Series D
180÷315
Non-ventilated
Servo-ventilated

ENGLISH
24
A pinion (toothed hub) dq is coupled to the motor
shaft br . The brake disc dm is fitted on the toothed
hub.
The brake disc and the toothed hub, connected to
the shaft, make up the rotating part of the brake.
The brake disc can move along the axis of the shaft
on the toothed hub towards the brake holder shield,
which forms the braking surface along with the
mobile armature dl .
Three studs es are screwed into the brake holder
shield and the electro-magnet dp is secured to them
using nuts fk Aand fk B. Six studs are used for size
160.
The mobile armature can slide along the axis of the
studs.
Springs fl are fitted around each stud, between the
mobile armature and the electro-magnet. These
springs are compressed using the nuts et to adjust
the braking torque.
Nuts fk Aand fk Bare used to adjust the air gap (see
paragraph 4.4), that is, the gap between the mobile
armature and the electro-magnet when the brake is
not powered.
A pinion (toothed hub) dq is coupled to the motor
shaft br . The brake disc dm is fitted on the toothed
hub.
The brake disc and the toothed hub, connected to
the shaft, make up the rotating part of the brake.
The brake disc can move along the axis of the shaft
on the toothed hub towards the brake holder shield,
which forms the braking surface along with the
mobile armature dl .
A pre-fitted unit (single piece) comprising the mobile
armature dl , springs fl and electro-magnet dp
completes the brake.
This single unit is secured to the brake holder shield
by fixing screws es .
Adjust the air gap (see paragraph 4.4) by turning the
fixing screws after having slackened the air gap
adjustment screws (nuts) fk A.
Motors from 63 to 160
If the motor is set up for the brake to be
mounted vertically it may feature some construc-
tion variations due to the particular installation
position.
2.3 Construction method for the
brake motor size 63
2.2 Construction method for the
brake motor sizes 71÷160
es fl et fk
A
fk
B
dp
dq
br dm dl
A
Y
br dm dl fl dp
et
es fk
A
dq Y
A
Fig. 2D
Fig. 2C
Size
71÷160 Size
63

25
ENGLISH
D
C
A
B
Position A
Standard position of the release lever
Position
B
Alternative position of the release lever
(optional on request)
Fig. 2F
The braking unit is secured to the brake holder shield
ct with eight fixing screws es .
A pinion (toothed hub) dq is coupled to the motor
shaft. The brake disc dm is fitted on the toothed hub.
The brake disc and the toothed hub, connected to
the shaft, make up the rotating part of the brake.
The brake disc can move along the axis of the too-
thed hub in order to move towards the brake holder
shield. The brake holder shield and the mobile arma-
ture dl make up the braking surface.
The electro-magnet dp is inserted into the braking
unit, along with up to nine springs fl . The electro-
magnet attracts the mobile armature, allowing the
rotation of the motor shaft. The springs push the
mobile armature against the brake disc, blocking the
rotation of the motor shaft.
The three adjustment screws et make it possible to
adjust the braking torque.
The eight nuts fk Apermit adjustment of the air gap
between the brake disc and the brake holder shield.
If the motor is set up for installation in verti-
cal position, the brake can present some con-
struction variations.
Size 71÷160 motors can be fitted with a manual
brake release lever that allows the shaft to rotate
even when the power is off.
The hand release lever
D protrudes from the brake
cover enclosure. Use a spanner C to rotate the
hand release lever clockwise or anticlockwise to free
the motor shaft.
Once the end of the stroke is reached
increase the torsion slightly until the motor shaft
is released. Do not apply excessive force to the
hand release lever.
When the spanner is released the hand release lever
automatically returns to its starting position and the
brake is applied on the motor.
2.5 Manual release 71÷160
(optional on request)
2.4 Construction method for the
brake motor sizes 180÷315
dm
ct fk
A
esfl et
dq dt ds
dl dp
Fig. 2E
Size
180÷315

P
Brake Brake
On Off
26
ENGLISH
On request, it is possible to have a manual brake
release that allows the shaft to rotate even when the
power is off. The release system is fastened to the
brake enclosure shield ds .
Turning the screw P clockwise about 45° releases
the motor shaft (figure 2G). Turn in the opposite
direction to reset the brake. n non-ventilated
motors, the release spanner is not included with the
motor (spanners are widely available on the market).
f the motor is servo-ventilated (figure 2H), insert the
specific release lever (provided with the motor) into
the lower part of the slot on the fan cover. Then push
towards the Brake Off position G . Turn in the oppo-
site direction to reset the brake, Brake On position
H .
Warning: before restarting the machine,
make sure that the brake is in the Brake On posi-
tion (figure 2H).
2.6 Manual release 180÷315
(optional on request)
Fig. 2G
3. Installation
n addition to information on the motor, the motor’s
nameplate also shows:
1 Brake type: Brake model fitted.
2 Brake voltage: power supply voltage [V] for the
brake
3 Operation: Maximum number of operating
cycles per hour and type of work cycle.
4 Power: electrical power absorbed by the brake
[VA] for motors 63÷160; [W] for motors 180÷315
5 Braking torque: Static braking torque [Nm]
6 Moment of inertia: Maximum moment of inertia
for the machine controlled, referred to the motor
shaft [kgm2].
3.1 Nameplate (information on the
brake)
Figure 3B - for motors 180÷315
Fig. 2H
H Brake On
G
Brake Off
Figure 3A - for motors 63÷160
II2G
0722 CES 09 ATEX 021 n1208819001y12
Electric Motor DB75 225M 4 3~
Exde IIB T4 P56
V A Hz 1/min cos ϕkW
440 ∆77.40 60 1778 0.83 45.0
760 44.69
B ake K10 140W AC220/1 400Nm
C416 CLF Ta45° C S1
J = 3.438 kgm2kg 650
Manufacturer Cemp srl - 20030 SENAGO (Milan) - TALY
regrease joints after any dismounting - fasteners quality 8.8 EN 898-1
Y
a d b c fe
0722 CES 03 ATEX 111 n1211549001y12
Electric Motor DB30 90L 4 3~
Exd IIB T4 P55
V A Hz 1/min cos ϕkW
230 ∆6.13 50 1400 0.79 1.50
400 3.54
B ake MEC8 0 140 VA AC400V/3
~ 20Nm
C416 CLF Ta40° C S1
J = 0.283 kgm2kg 52
Manufacturer Cemp srl - 20030 SENAGO (Milan) - TALY
regrease joints after any dismounting - fasteners quality 8.8 EN 898-1
Y
a d c b fe
II2G

27
ENGLISH
Before making the connection check
the data shown on the nameplate against that on
the connection diagram.
All electrical connections are to be made by qualified
personnel.
Motors from 63 to 160
When making a connection use the diagram supplied
with the motor and bear in mind that the brake may
be provided for various types of power supply:
• Alternating three-phase power (the voltage may
differ from that for the motor). f the voltage of the
brake is higher than 420 V, the power supply ter-
minal of the brake is positioned in a separate box.
• DC power.
n the latter case, with direct current electro-mag-
nets, the brake may be powered:
- Directly via a direct current line.
- By a single-phase alternating current line via a rec-
tifier in the terminal box (version possible only with
Ex-d protection).
Motors from 180 to 315
The braking unit has its own terminal box containing
brake terminals and any accessories. Motors with
Ex-d type protection have the DC/AC rectifier inside
the terminal box, while motors with Ex-de type pro-
tection have the rectifier located inside the brake
enclosure.
When making a connection use the diagram supplied
with the motor and bear in mind that the brake may
be provided for various types of power supply:
- Directly via a direct current line.
- by a single-phase alternating current line via a rec-
tifier in the terminal box or in the brake cover
enclosure.
Upon request auxiliary devices can also be fitted on
the brake, such as thermal protection devices and
anti-condensation heaters.
These auxiliary devices have specific power supply
terminals in the terminal box that must be connected
as per the diagram supplied with the motor.
Adequate precautions must be taken to
avoid excess voltages or peak voltages. The
cables must not be crushed or exposed to
mechanical loading.
When the motor is fitted with a manual brake release
lever it must be installed so as to avoid any acciden-
tal activation of the release unit and ensures that it is
easy to release when necessary.
The release spanner must not be left on the hand
lever when the motor is running.
3.4 Manual release (optional on
request)
3.3 Connection for auxiliary devices
3.2 Electrical connections

28
ENGLISH
4. Maintenance
Any work on the motor is to be carried
out with the machine stopped and disconnected
from the power supply.
Over time the original characteristics of the motor
with brake can only be ensured by means of an
inspection and maintenance programme prepared
and managed by qualified technicians.
The type of maintenance and frequency of checks
depends on the ambient and working conditions.
Especially wear on the brake disc depends on vari-
ous factors: load inertia, motor rotation speed, and
frequency of engaging.
As a general rule we recommend an initial inspection
after about 500 working hours and not later than one
year after starting up for the first time. Subsequent
inspections must be carried out according to sched-
uled plans.
n order to work accurately, the motor must be dis-
mantled from the machine and placed on a work-
bench with all the tools and equipment required to
hand.
During dismantling and assembly proce-
dures, accident prevention standards and safety
information must be complied with rigorously.
For self-ventilated motors (H Series) (fig. 2A) remove
the fan cover
bq by unscrewing the fixing screws and
remove the fan cr .
For motors fitted with a manual brake release (fig.
2F), pull the hand lever D outwards, hold it up and
put a pin throuch the hole.
Unscrew the fixing screws and remove the brake
cover enclosure being careful not to damage the
flameproof joints.
Having completed the inspection or maintenance,
before closing the brake cover enclosure:
• Make sure that the air gap is set correctly (see
paragraph 4.4).
• Reinstate the original layer of grease (e.g.
Molyduval Bariplex grease) on the flameproof
joints.
• Check that the friction surfaces (brake disc, brake
holder shield, and mobile armature) are clean and
free from oil or grease.
The motor is supplied with a ready-to-use calibrated
brake. Customers with special application needs can
ask for a customised calibration setting. The braking
torque is shown on the motor’s nameplate.
The braking torque can be adjusted to suit working
needs. n this case, we suggest avoiding values that
are too high as these could prevent normal opening
of the brake, or values that are too low as these could
cause the brake to slip.
Reducing the braking torque to below the maximum
value, under certain load conditions, will result in a
reduced wear of the brake’s friction material.
For size 71÷160 motors (fig. 2C) the brake torque is
adjusted by turning the nuts
et to change distance
A . When these are turned anticlockwise the braking
torque is reduced.
For size 63 motors, it is not possible to adjust the
braking torque. The reference value of the braking
torque is shown in table 4A.
In order to obtain even braking torque set-
tings length
A must be the same for all the
springs.
The table below shows the braking torque values in
relation to distance
A .
These torque values are subject to a tolerance of
-20% compared to the values shown in the table.
4.1 Introduction
4.2 Dismantling and re-assembling
the brake cover enclosure
motors 63÷160
4.3 Adjusting the braking torque
motors 63÷160

29
ENGLISH
Table 4A - Adjusting the braking torque
Frame
size
Brake
type
A0
[mm]
Braking torque [Nm] for A =
A0A0+1mm A0+2mm A0+3mm A0+4mm A0+5mm A0+6mm
63 AC1 0 4,5 --- --- --- --- --- ---
71 MEC 63 14 9,0 6,0 3,0 --- --- --- ---
80 T80 12 17,0 13,5 10,0 6,5 --- --- ---
90 MEC80 18 35,0 32,0 29,5 27,0 24,0 21,5 18,5
100 MEC90(◆)17 48,0 42,0 36,0 30,0 24,0 18,0 12,0
112 MEC100(◆)20 70,0 57,0 44,5 32,0 19,0 --- ---
132 MEC112(◆)23 90,0 77,0 63,0 49,0 35,5 21,5 ---
160 T140(◆)23 130,0 110,0 90,0 70,0 55,0 35,0 ---
A0= distance for the standard braking torque value
(◆) = 2 braking disks available on request
The recommended air gap, with a tolerance of ± 0,05
mm is shown in table 4B.
The air gap Y (fig. 2C and 2D) is the gap between
the faces of the electro-magnet and the mobile arma-
ture, when the brake is not powered (motor brake on).
This value must be adjusted when, due to wear on
the brake disc friction material, the air gap increases
beyond the values shown in table 4B, affecting the
brake’s performance.
The maximum acceptable air gap under maximum
torque conditions is 0,7 mm.
Table 4B - Recommended air gap
For size 71÷160 motors (fig. 2C) the air gap is
adjusted by turning the nuts
fk Aand fk Bto move
the electro-magnet to the original gap from the
mobile armature.
For size 63 motors (fig. 2D) the air gap is adjusted by
turning the fixing screws es after having slackened
the adjustment nuts fk A. Once the required gap has
been set, the adjustment nuts must be tightened
against the single unit.
Before carrying out this operation make sure that
the brake casing has not overheated.
Failure to adjust the air gap may result in the
brake not opening properly, which in turn results
in the motor and the brake heating up.
For motors with a manual release, if the air gap
exceeds the maximum value, rotating the release
spanner may not be sufficient to adequately
release the brake.
Frame
size
Brake
type
Air gap
[mm]
63 AC1 0,2
71 MEC 63 0,3
80 T80 0,3
90 MEC80 0,3
100 MEC90 0,3
112 MEC100 0,3
132 MEC112 0,5
160 T140 0,3
4.4 Adjusting the air gap
motors 63÷160

30
ENGLISH
The brake disc must be changed when 1,5 mm of
friction material has worn off each side (total wear 3
mm). This corresponds to an overall thickness of the
brake disc of about 7 mm for sizes 71÷100, 8 mm for
sizes 112÷160, and about 4 mm for size 63.
For the 71÷160 range of motors (fig. 4A), proceed as
follows:
- Unscrew the first set of nuts
fk Band remove the
electro-magnet being careful not to damage the
power supply cables for the brake. Unscrew the
second set of nuts fk A, the adjustment nuts et
and remove the springs. Remove the mobile arma-
ture and pull the brake disc off the toothed hub.
Replace the brake disc and reassemble the parts
removed previously, being careful to set the brak-
ing torque (see 4.3) and the air gap (see 4.4).
For size 63 motors (fig. 4B), proceed as follows:
- Unscrew the fixing screws
es and remove the sin-
gle unit being careful not to damage the power
supply cable for the brake. Pull the brake disc off
the toothed hub. Replace the brake disc and
reassemble the parts removed previously, being
careful to set the braking torque (see 4.3) and the
air gap (see 4.4).
4.5 Changing the brake disc
motors 63÷160
es fl et fk
A
fk
B
dp
dq
br dm dl
A
Y
br dm dl fl dp
et
es fk
A
dq Y
A
Fig. 4B
Fig. 4A
Size
71÷160
Size
63

31
To replace the braking unit or one of its parts (elec-
tro-magnet dp , mobile armature dl , brake disc dm ,
springs fl , it is necessary to remove both the brake
enclosure shield ds and the brake cover enclosure
dt .
A) Disassembly of the brake enclosure shield ds
Remove the eight screws and remove the brake
enclosure shield taking care not to damage the
coupling joints.
B) Disassembly of the brake cover enclosure dt
Disconnect the two power wires to the electro-
magnet, remove the eight screws that hold the
brake cover enclosure dt to the brake holder
shield ct and remove the brake cover enclosure,
taking care not to damage the coupling joints.
C) Replacement of the complete braking unit
Disassemble the brake enclosure shield and the
brake cover enclosure, disconnect the two power
wires to the electro-magnet, remove the rectifier
(only in motors with Ex-de type protection),
unscrew the eight fixing screws (studs) es and
remove the braking unit.
Follow the directions in reverse order to mount the
new braking unit. When the brake holder shield
ct is in place, adjust the air gap with the eight
screws fk A.
D) Replacement of the electro-magnet dp
Disassemble the brake enclosure shield and the
brake cover enclosure, disconnect the two power
wires to the electro-magnet, remove the rectifier
(only in motors with Ex-de type protection),
unscrew the eight fixing screws of the brake es
and remove the electro-magnet dp .
Follow the directions in reverse order to mount the
new electro-magnet. When the braking unit is
fastened to the brake holder shield, adjust the air
gap with the eight screws fk A.
E) Replacement of the brake disc dm , the mobile
armature dl , the springs fl
Follow the directions given above to disassemble
the brake enclosure shield, the brake cover enclo-
sure, the electro-magnet and the DC/AC rectifier (if
present). Remove the component(s) to be repla-
ced.
Follow the directions in reverse order to mount the
new component, and then the electro-magnet,
being careful to reconnect the electrical wiring cor-
rectly. When the braking unit is fastened to the
brake holder shield, adjust the air gap with the
eight screws (nuts)
fk A.
F) Replacement of the encoder and/or micro-
switch (optional - figure 4D)
f the electric motor is fitted with an encoder and a
micro-switch to signal whether the brake is open
or closed, these parts are installed inside the
brake cover enclosure.
f1) To replace the encoder N , first remove the eight
screws and the brake enclosure shield ds taking
care not to damage the coupling joints.
Disconnect the encoder’s power wires (normally 9
wires) from the terminal box M inside the brake
enclosure.
Remove the fixing screw between the encoder
and its anti-rotation plate L .
Loosen the encoder fixing screw on the motor
shaft and remove it manually.
Follow the directions in reverse order to reassem-
ble the piece.
4.6 Adjusting the braking torque and
replacing the braking unit and/or
its parts for motors 180÷315
ENGLISH
dm
ct fk
A
esfl et
dq dt ds
dl dp
Fig. 4C
Size
180÷315

32
ENGLISH
f2) To replace the microswitch I , first remove the
eight screws and the brake enclosure shield ds
taking care not to damage the coupling joints.
Then, disconnect the brake power cables (mar-
ked BA1, BA2) and the micro-switch power
cables (marked BM1, BM2) from the terminal box
M . f present, remove the encoder (see F1). Then
disassemble the brake cover enclosure dt and
the micro-switch I that is set on the external cir-
cumference of the electro-magnet.
Follow the directions in reverse order to connect
the micro-switch, the brake and the encoder, if
present.
G) Final reassembly
Remount the brake cover enclosure and the brake
cover with the relative fixing screws, taking care to
grease the coupling joints lightly beforehand.
roper functioning of the brake can only be
guaranteed if original spare parts are used.
The air gap must be regulated at 0.3-0.4 mm.
4.7 Adjusting the air gap
motors 180÷315
I
L
M
N
Fig. 4D

33
ENGLISH
5. Troubleshooting
Fault ossible causes Solution
The brake does not release Air gap too big (wear) Check the air gap. Replace the
brake disc if necessary
No power to the brake Check electrical connection
Low power supply voltage for the
brake
Check power supply voltage
Brake disc stuck mechanically Remove mechanical blockage
Rectifier damaged (when fitted) Check rectifier and change if nec-
essary
Electro-magnet defective Check electro-magnet and change
if necessary
Brake overheated (if heat sensors
are fitted)
Cool brake, check braking torque,
and replace any worn parts (disc)
The brake has a delayed action Power supply voltage high Check power supply voltage
The brake releases after a delay Air gap too big (wear) Check air gap. Replace the brake
disc if necessary
Low power supply voltage for the
brake
Check power supply voltage
The brake does not stop
the motor
Residual activation voltage too
high (when a rectifier is fitted)
Check residual voltage
Brake disc stuck mechanically Remove mechanical blockage
Braking torque too low See below
Braking torque too low Springs incorrectly tensioned Adjust the springs according to
table 4A or point 4.6
Air gap too big Check the air gap against table
4B or point 4.7. Replace the brake
disc if necessary
Oil or grease on the brake disc
surface
Clean dirty parts
Springs broken Replace the springs or the brake

Ne redigere questa documen-
tazione è stata posta ogni
cura a fine di assicurare a
correttezza de e informazio-
ni contenute.
Tuttavia, anche in conse-
guenza de a po itica di con-
tinuo svi uppo e mig iora-
mento de a qua ità de pro-
dotto perseguita da Cemp, a
società si riserva i diritto e
a faco tà di apportare modi-
fiche di qua siasi genere, in
qua siasi momento e senza
preavviso, sia a questo docu-
mento sia ai propri prodotti.
Le descrizioni e e caratteri-
stiche tecniche de a presen-
te pubb icazione non sono
quindi impegnative e i dati
riportati non costituiscono,
in nessun caso, impegno
contrattua e.
Every care has been taken to
ensure the accuracy of the
information contained in this
pub ication.
Due to Cemp’s po icy of con-
tinuous deve opment and
improvement, the company
reserves the right to supp y
products which may differ
s ight y from those i ustra-
ted and described in this
pub ication.
Descriptions and technica
features isted in this bro-
chure may not be considered
as binding. Under no circum-
stances shou d data in this
pub ication be considered as
a contractua ob igation.
Dans a préparation de cette
documentation nous avons
pris e soin d’y intégrer es
informations es p us exactes
possib es.
Néanmoins, compte tenu de
notre po itique de déve op-
pement et d’amé ioration
continue des produits, a
Société Cemp se réserve e
droit et a facu té d’apporter
toute modification sur a
documentation et sur es pro-
duits, à tout moment et sans
préavis.
Les descriptifs et es caracté-
ristiques techniques conte-
nus dans ce cata ogue
n’engagent pas a Société.
Par conséquent, ces données
ne constituent en aucun cas
un engagement contractue .
Die Ausführungen und tech-
nischen Eigenschaften, die in
dieser Broschüre angegeben
sind, dürfen nicht a s ver-
bind ich angesehen werden.
In keinem Fa können jedoch
die in diesem Dokument auf-
geführten technischen Daten
a s recht ich verbind ich
angesehen werden.
Cemp behä t sich das Recht
vor, ohne Mittei ung, jeg iche
Abweichungen und Änderun-
gen jederzeit vorzunehmen,
sowoh in diesem Dokument
a s auch bei den Produkten,
die hier beschrieben sind.
La presente documentación se
ha redactado de manera muy
atenta para poder asegurar
que as informaciones que
contiene son correctas.
No obstante, como consecuen-
cia de a po ítica de continuo
desarro o y mejora de a ca i-
dad de producto que Cemp
pone en práctica, a sociedad
se reserva e derecho y a
facu tad de modificar en o
que fuera necesario, en cua -
quier momento y sin que para
e o medie preaviso a guno,
tanto este documento como
sus productos.
Por o tanto, as descripciones
y as características técnicas
indicadas en e presente docu-
mento no son vincu antes, y
os datos que contiene no
constituyen en ningún caso,
víncu o contractua .

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NL-3881 LB Putten
T [phone]
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