MK Diamond MK-2000P - Manual (Page 9)

9
OVERLOAD PROTECTION
The speed of the drill will need to be adjusted in accordance with the size of the core bit being used.
The speed of the drill is adjusted by rotating the Speed-selector in the clockwise direction, while turn-
ing the drill shaft by hand until the clutch is engaged.
If the Speed-selector is in the “o” position, drill speed can be adjusted from 0 to 1000 rpm.
If the Speed-selector is in the “oo” position, drill speed can be adjusted from 0 to 2000 rpm.
It is easier to start a hole with a centering bit. The switch allows the drill to be operated at slow speed
for safely introducing the bit into the material. A normal pilot hole should be from .2 to .4 inches (5 to
10 mm) in depth. Once the pilot hole is created, the centering bit can be removed and replaced for full
speed operation.
If the core bit is suddenly blocked in the hole, a clutch will slip, disengaging the bit from the motor.
If excessive penetration speed results in an overload condition, an electronic switch will open discon-
necting the motor from the power supply.
Once the drill is removed from the hole and the electronic switch is reset, coring may resume.
If the drill is operated in a continuous overload condition and the Electronic Overload Protective device
fails, the Thermal Overload protective device will interrupt power to the motor.
Once actuated, the motor must be allowed to cool to reset the Thermal Overload protective device.
Time required for the Thermal Overload protective device to reset will vary depending on the tempera-
ture of the motor and ambient temperature.
To protect the operator and the drill, the MK-2000P is equipped with three overload protective devices -
mechanical, electronic and thermal. In case of overload, the MK-2000P is equipped with warning device.
For core bits with diameters above 2.8 in. / 70 mm, operate the drill using the “o” (0 to 1000) rpm range.
For core bits with diameters below 2.8 in. / 70 mm, operate the drill using the “oo” (0 to 2000) rpm range.
1. When using the handheld method, operate the drill in the 0 to 2000 rpm range only.
2. Always check the core bit manufacturer’s recommendation for use.
3. Gear shifting should only be performed in the clockwise direction when the drill is stopped.
Gear Shifting
Starting a Hole
Mechanical Overload Protection
Electronic Overload Protection
Thermal Overload Protection
MK-2000P OPERATION
CAUTION