Fein KBM 50 Q User manual

MVK 03 / 07
Alle Rechte bei FEIN, insbesondere für den Fall der Schutzrechtsanmeldung.
Jede Verfügungsbefugnis wie Kopieren und Weitergaberecht liegt bei FEIN.
Fein Repair Tool
KBM 50 Q (X)

MVK 03 / 07
Alle Rechte bei FEIN, insbesondere für den Fall der Schutzrechtsanmeldung.
Jede Verfügungsbefugnis wie Kopieren und Weitergaberecht liegt bei FEIN.
Fein Repair Tool
Table of Contents
1. Technical Data
2. Maintenance
3. Electrical Functional Testing
4. Disassembly of the Core Drill Unit
5. Assembly of the Core Drill Unit
6. Tools

MVK 03 / 07
Alle Rechte bei FEIN, insbesondere für den Fall der Schutzrechtsanmeldung.
Jede Verfügungsbefugnis wie Kopieren und Weitergaberecht liegt bei FEIN.
Fein Repair Tool
0. Productinformation
Based on some breakdowns on gear housings in the past, stripped thread on the
clamping lever , we mounting a Helicoil –insert in the gear box serially since
Mai 2010. ( siehe picture )

MVK 03 / 07
Alle Rechte bei FEIN, insbesondere für den Fall der Schutzrechtsanmeldung.
Jede Verfügungsbefugnis wie Kopieren und Weitergaberecht liegt bei FEIN.
Fein Repair Tool
1. Technical Data
Order Reference 7 270 30 00 23 4
Type KBM 50 Q
Input Watts 1200
Output Watts 680
Speed, full load R.P.M. 260/520/min
Current type 1~
Protection class l
Cable length with plug m 4
Net weight kg 12
Capacity in steel max. Ø, core drill mm 12-50
Capacity in steel max. Ø, spiral drill (with drill chuck) mm 16
Threaded drill M 16
Tool holder on drill shaft Quick IN
Magnetic holding power N 11000
Drilling depth max. with core drill mm 50
Height (drill jigs) mm 368
Stroke (adjustable) mm 135-310
Magnetic foot dimension mm 180 90

MVK 03 / 07
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Jede Verfügungsbefugnis wie Kopieren und Weitergaberecht liegt bei FEIN.
Fein Repair Tool
2. Maintenance
Please make sure that electric tools are repaired, serviced and tested by
specialists only as repairs carried out in an inexpert manner may cause
considerable hazards for the user (BGV A2).
Repeated tests are to be performed in accordance with DIN VDE 0702-1.
The regulations in accordance with DIN VDE 0701 Part 1 are to be observed after
any repairs.
Withstand voltage at 1000 V (Protection class 1)
Use original FEIN spare parts only!
During commissioning, while working and during maintenance of the core drilling
unit, applicable national accident prevention requirements of the professional
organization must be observed.
The law governing technical working equipment (Device Safety Law) applies in
terms of proper use.

MVK 03 / 07
Alle Rechte bei FEIN, insbesondere für den Fall der Schutzrechtsanmeldung.
Jede Verfügungsbefugnis wie Kopieren und Weitergaberecht liegt bei FEIN.
Fein Repair Tool
2.1. General Maintenance Tasks
Check the power cord (900) for areas of damage.
Blow out the motor with dry compressed air.
Check the carbon brushes (2.2.).
Small functional test (3.1.).
2.1.1. Maintenance intervals:
Depending on the nature and duration of use, no later than after 6 months:
- Clean the drill motor.
- Brush or blow out the brush holder and insulating parts.
2.2. Replacing the carbon brushes:
The drill motor is equipped with carbon brushes that shut off automatically.After the
minimum length of the carbon brushes has been reached, the power supply is
interrupted. If this happens, the carbon brushes must be replaced by an electrical
specialist. If you are using new carbon brushes, make certain to check that they move
easily inside the brush holder.Allow new carbon brushes to run for 15 minutes without
load. Use only
original FEIN carbon brushes!

MVK 03 / 07
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Fein Repair Tool
3. Electrical / Functional Tests
3.1. Minor functional test
3.2. Major functional test
3.3. Test data
3.4. Test devices and auxiliary materials
3.5. Wiring diagram
3.6. Safety test
3.7. Functional test

MVK 03 / 07
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Fein Repair Tool
3.1. Minor functional test
3.1.1. Self-start lock and magnetic foot
Turn on the master switch and the motor switch. Then connect the core drilling
machine to the electrical power.
The motor must not start up.
The magnetic foot is energized.
Check the power consumption (0.4 A, see 3.3. Test data).
Motor switch off.
Magnetic foot remains energized.
Power consumption must be reduced to one half (0.2 A, see 3.3. Test data).
3.1.2. Motor
Motor switch on.
Motor starts up.
3.1.3. Characteristic curve of the motor
Place the motor under load.
Speed is regulated.
From about 1600 Watts on the speed drops off more sharply.
3.1.4. Overload switch off
Place the motor under heavy load.
The motor switches off after 10 seconds.
The motor must be run at idle for about 60 seconds before the test.

MVK 03 / 07
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Jede Verfügungsbefugnis wie Kopieren und Weitergaberecht liegt bei FEIN.
Fein Repair Tool
Possible causes Test possibilities
Magnetic foot does not
energize:

Check with
magnetisable part
power cable disconnected,
switch off,
connector not plugged in

LED on board must light up
briefly while switching on.

check power voltage on
X1, X2 continuity
magnetic foot defective 
LED on board is flashing

measure resistance (504Ω±5%)
elektronics defective 
LED on board is flashing

measure voltage on X7.1 and
X7.2 .
Magnetic holding force
too weak: do not turn on while testing
motor switch 
measure the voltage on X7.1
and X7.2
 measure the magnetic foot defective 
measure resistance (504Ω±5%)
removal force
required standing surface uneven 
visual inspection
elektronics defective 
measure the voltage on X7.1
and X7.2
3.2.1. Major functional test
Note: If the magnetic foot is defective, no further tests are possible.
Because of magnetic foot monitoring, the motor cannot be turned on.
Connect the spare magnetic foot.

MVK 03 / 07
Alle Rechte bei FEIN, insbesondere für den Fall der Schutzrechtsanmeldung.
Jede Verfügungsbefugnis wie Kopieren und Weitergaberecht liegt bei FEIN.
Fein Repair Tool
3.2.2. Major functional test
Possible causes Test possibilities
Motor does not start up:
Switching sequence not
maintained 
Turn master switch on first, then
motor switch
Power cord disconnected,
switch off, connector not
plugged in

LED on board must light up
briefly while turning on.

Test mains voltage on X1, X2

Test continuity
Magnetic foot defective 
LED on board flashes

Measure resistance (504 Ω
±5%)
Error in motor power supply
line 
Test continuity
Motor switch defective 
Test
Carbon brushes worn out 
Visual inspection
Motor defective 
Test motor without electronics
(at max 145 V AC, see 3.3)
Measure idle speed
The reasons listed here
all cause the automatic
startup disable to
engage
Electronics defective 
If motor is defective, connect
replacement motor to X5, X6
and connect cable from speed
recorder to X8. Measure idle
speed or voltage