Emerson Branson LPX - Table 5.8 Maximum Power;Duty Cycle

100-412-196 REV. 06 37
5.2.9 Maximum Power/Duty Cycle
Converter performance and reliability can be adversely affected if the converter ceramics
are subjected to temperatures above 140° F (60° C). The converter front driver
temperature should not exceed 122° F (50° C).
To prolong converter life and maintain a high degree of system reliability, the converter
should be cooled with clean, dry, compressed air, particularly if your application calls for
continuous ultrasonic operation. Converter cooling is especially critical in 40 kHz
applications.
Use one of the following procedures to determine if a converter is operating close to the
maximum allowable temperature. Check converter temperature immediately after
substantial machine operation and without power applied to the horn.
• Press a pyrometer probe (or similar temperature measuring device) against the front driver of
the converter assembly. Wait for the probe to reach the temperature of the shell. If the
temperature is 120° F (49° C) or higher, the converter requires a cooling air stream
• If a temperature measuring device is unavailable, use your hand to feel the shell of the converter.
If the converter is hot to touch, the converter requires a cooling air stream
High duty cycles will require additional cooling for the converter (Use Vortec or equivalent
air conditioning systems). The system average power must be limited to the specified
continuous maximum. Higher peak power (to the minimum acceptable power limit) with
the listed on time may be obtained if appropriate off time insures that the average
Continuous Duty Max Power is not exceeded.
Table 5.8 Maximum Power/Duty Cycle
Freq/Pwr
Rating
Converter
Max. Power
With Cooling
Max. Power
Continuous With
Cooling
20 kHz @
150W
CH, TW 50% 10 second on/off 75 W
20 kHz @
550W
402, 902 100% 10 second on/off 250 W
30 kHz @
550W
CR, CS, CH, CP 100% 2 second on/off 250 W
40 kHz @
150W
4TR, 4TH, 4TP,
4TJ
100% 10 second on/off 150 W
KTJ, KTR, 4C 70% 10 second on/off 150 W
40 kHz @
550W
4TR, 4TH, 4TP,
4TJ
70% 10 second on/off 250 W