
B–70115EN/03
10. REPLACEMENT PROCEDURES
325
Replace the flow sensor as follows:
(1)Turn off the power to the CNC, then turn off the power to the laser
oscillator. In addition, open the main circuit breaker for the laser
oscillator.
(2)Drain all cooling water from the oscillator, using compressed air, for
example. Compressed air must be supplied only from the cooling
water inlet.
(3)Disconnect the sensor Faston terminal from the terminal block.
(4)Remove the four bolts, then remove the sensor. Be careful not to
damage the float.
(5)The flow sensor consists of a float and read switch section. When
replacing the float, shift and remove the float core from the shaft hole
on the sensor flange, then mount a new float core. When replacing the
read switch section, replace the Bakelite plate.
(6)Mount the float section on the sensor flange. (Be careful not to deform
the wire ring. To prevent this, hold the plate of the float section
between your fingers.) Then, insert the sensor into the block of the
distribution unit, ensuring that the O–ring is fitted correctly. At this
time, the wire ring of the float must be hanging downwards. Also, be
careful not to disconnect the float. Secure the sensor by tightening the
four bolts.
(7)Operate the chiller unit manually to circulate cooling water. Check
that no water leaks from the joints that were disconnected during the
replacement. After checking, restore the original chiller setting.
Check the amount of water in the chiller unit, and add water if
necessary.
(8)Adjust the flow sensor as described in Section 9.7.
REMOVE SCREWS
(4POS.)
REED SWITCH
MAGNET
BALANCER
Fig. 10.17 (a) Detail of water flow rate sensor (C1500B, C2000B, C3000C)
10.17
REPLACING THE
FLOW SENSOR