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CHANGES AND TYPING ERRORS RESERVED CHANGES AND TYPING ERRORS RESERVED
Protection of the main motor
The main motor is protected by a 3VU1340 auto switch (QF1), which can protect the motor from overload.
Protection of coolant pump
The coolant pump is protected by means of a 3VE automatic switch (QF2).
Tapping operation
Tapping operation is controlled by contactors KM1, KM2 and select button SB6. The travel limit of tapping is
controlled by SQ2, SQ3.
When tapping, turn the select button SB6 to position `1’ (‘0’ for driving), turn the LW6B combination switch to
`1’ to start the spindle forward (KA1, KM1 engaged). Hand feed spindle downward until the tool touches the
work piece to be tapped. When the tapping depth is reached, limit switch SQ3 is activated; the spindle rotates in
reverse direction (KA1, KM2 engaged) and the tap withdraws from the workpiece.
When the spindle returns to the highest point, limit switch SQ2 is operated. The spindle rotates forward and one
cycle of operation is finished.
For the next tapping operation, repeat the steps above. For drilling, turn the button SB6 to position `0’.
Warning! The motor turns forward and reverses frequently during tapping, so each operation should not exceed
8 times per minute. Please stop the motor and cool it down when it is hot, otherwise the motor could be burnt
down.
Power feeding operation
Move the spindle 5-6 mm down and push one of the buttons at the end of the feed levers. The electromagnetic
clutch is engaged, automatic feed starts and the indicator lamp HL2 lights. Drilling is stopped by the limit
switch when the desired depth is reached. If you need to stop the power feed, push button (5) to disengage the
electromagnetic clutch.
Emergency stop
During the process of machining, the emergency stop button SB3 can be pushed down for an emergency stop.
When SB3 is pushed down, contactor (relay) loses current and the machine stops. To restart the machine, relieve
the mechanical lock of the button.
Zero voltage protection
Zero voltage protection is provided by contactor (relay). When the power is restored, push button SB4 to engage
contactor and restart the machine.
The function of the safety guard
The machine can not be started when the safety guard is not in the correct working position.
10.3. mainTenance of elecTrical equipmenT
Disconnect the main power supply before checking the electrical equipment. Keep the equipment clean by
removing dust, dirt and grease regularly. You may not use volatile liquids (such as kerosene or gasoline) as
cleaner. The working voltage of the motor must not exceed ± 5 % of the rated voltage. To ensure the machine
runs normally, regular maintenance of the motor is a must.
Designation Description Specification and model Quantity Note
QF1 Automatic switch 3VU1304-ONK00 1 4A
QF2 Automatic switch 3VE1 DZ108-20 1 0.63A
QF3-QF5 Automatic switch DZ47 (C3) 3 1P 3A
QS1 Automatic switch KG10B 1
QS2 Power switch 6LBB-20A 1
SB1 Change over switch LA42P-10/B 1
SB2, SB7 Push button LA42P-01/R 2
SB3 Push button LA42J-01/R 1
SB8 Push button LA42XL2-30/B 1
SB9 Push button LA42XL2-10/B 1
SB10 Push button LA42XL2-12/B 1
SQ1-SQ4 Limit switch LXW16-16/61C2 4
SQ5 Limit switch E62-10A 1
KM1-KM3 Contactors 3TB4122-OXBD 3 AC24V
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