12
Before operating, select required mode by align-
ing symbol on switch with arrow. Ensure selec-
tor is locked in position. It could cause a hazard if
the selector switch is not firmly locked.
Note:
In cold weather or when the tool has not
been used for a long time, operate the rotary
hammer for approximately 3 mins. under no
load before Hammer Drilling or Chiselling.
7. VARIABLE SPEED CONTROL
(See Fig. 11)
The speed of the Rotary Hammer is adjusted by
the variable speed control (8) this sets the maxi-
mum/minimum speed and impact rate for the
drill, with ‘A’ at the lowest speed/impact rate and
‘G’ the highest.
High Power Mode (position 8) should only be
used for chiselling concrete or when using break
through bit.
Selecting the speed, frequency and
impact energy
Rotate the regulator (8) to choose a position
appropriate for the processed material. The
constant electronics maintain the speed, the
frequency and the impact energy constant, in-
dependently of the load, thus ensuring steady
operation mode. It is recommended to use the
operation modes listed in the table.
Application
Regulator
position
Rotation
speed
Impact
rate
Single
impact
energy
Render /
Light con-
struction
materials
A – B
200–225
min
-1
1900–
2100
min
-1
4 J
Bricks/
Chiselling
tiles
C – D
250–275
min
-1
2350–
2600
min
-1
6–7 J
Drilling in
concrete
E – F
300–325
min
-1
2850–
3050
min
-1
8–9 J
Chiselling
concrete
G
3300
min
-1
11 J
Fig. 10
Fig. 11
Fig. 12
1)
2)
3)
Fig. 9
Summary of Contents for ERB121SDS
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