19
CYCLE SPEED
The maximum frequency parameter (f
max
) determines the maximum speed of the nozzle at 50% duty cycle and is
entered as a number of cycles/minute. This parameter can be found in the datasheet of the electric spray nozzle being
used.
The spray control panel will calculate the cycle speed to conform to the following requirements (in this order):
•
As slow as possible to prevent wear of the spray nozzle.
•
Correct duty cycle this means ON
-
time / (ON
-
time + OFF
-
time) = duty cycle.
•
OFF time lower or equal than the maximum on/off time parameter. This prevents striping and very low
frequencies at low duty cycles.
•
ON time lower or equal than the maximum on/off time parameter. This prevents striping and very low frequencies
at high duty cycles.
•
Frequency of the signal higher than the PWM minimum cycles/min setting. This can be used to keep the frequency
constant for a large range of duty cycles.
•
ON and OFF time higher than or equal to the minimum pulse width of the gun. This ensures that the nozzle is able
to open and close at the same speed as the signal.
Cycle speed settings allows for the editing of the minimum and maximum cycles per minute, as well as the spray
thickness. Maximum cycles speed is 7,500 cycles/min, minimum range is 0
-
60 cycles/min.
•
Maximum cycle speed:
Maximum speed that the nozzle should switch at for this application. This entry will be
limited by the type of nozzle selected.
•
Minimum cycle speed:
Minimum cycle speed for the 1750+ is recommended for this application.
Note:
If you want a constant cycle speed, enter a large spray thickness, and use the minimum cycle speed as your
required cycle speed entry. The 1750+ will then cycle at this speed whenever possible.
Cycle Speed Example:
For a nozzle that can achieve 10,000 cycles/min, the minimum pulse width is 3ms. This ensures that the combination
of duty cycle and cycle speed falls within the triangle curve of the PulsaJet® electric spray nozzles (See figure below).
The triangle is the approximate operating range of the nozzle. As long as operating parameters (duty cycle and
frequency) are inside this triangle, the nozzle will operate normally. If the operating parameters are outside the
triangle, the nozzle will not operate.
Example:
Spray Nozzle: AAB10000AUH
-
03
•
Maximum cycle speed: 10000 cycles/min
•
Minimum cycle speed: 0 cycles/min (= disabled)
•
Minimum pulse width: 3ms
Objective:
•
Maximum on/off time: 0.010 s or 10ms
•
Duty cycle: 30%
Editing Cycle Speed Settings
