BWT Lightning BFL-CW500 - Page 27

Lightning Series Fiber Laser User Manual
23
tap water. The filter element in cooling system should be replaced periodically.
Adding 5-10% anhydrous alcohol to the cooling water can effectively prevent the
reproduction of microorganisms, which ensures the reliable operation of the laser.
In winter, an appropriate amount of antifreeze should be added into the water to prevent the
water loop in the laser and the chiller from any freezing. The freezing point of the antifreeze must
be 5°C lower than the minimum ambient temperature.
Since ethylene glycol antifreeze commonly used is corrosive, it is necessary to add ethylene
glycol inhibitor when replacing the antifreeze before winter.
Note: The addition amount of inhibitor is different for different brands and models.
Please adding according to the instruction of inhibitor company.
When shutting down the laser for a long time, please empty the cooling water in the laser and
QBH in time, otherwise the laser equipment may be damaged. When draining the water stored in
the QBH, the air pressure used must be less than 0.1Mpa as higher air pressure may cause the
damage of fiber.
In summer, condensation risk must be considered. Once the cooling temperature of the chiller
is lower than the dew point of the environment inside the laser, the moisture in the air will
condense on the electrical and optical modules, and then on laser appearance if without effective
preventive actions. Therefore, once you see condensation on the laser cover, it means that
condensation has occurred inside the laser, so you must power off the laser immediately, stop
working and optimize the operating condition of the laser.
In order to mitigate the condensation risk, it is recommended to supply the clean and dry
compressed air into the laser through the CDA port on the rear panel. The gas pressure needs to be
controlled at 0.1MPa. The compress air must be moisture and oil free.
Table 10 Dew points at different ambient humidity
Ambient
temperature
Dew point temperature at different relative humidity ℃
40%
50%
60%
70%
75%
80%
85%
90%
95%
16℃
2
6
8
11
12
13
13
14
15
18℃
4
7
10
12
13
14
15
16
17
20℃
6
9
12
14
15
16
17
18
19
22℃
8
11
14
16
17
18
19
20
21
24℃
10
13
16
18
19
20
21
22
23