15
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. However, it is sometimes possible to use a higher value when a supply voltage of 48VDC is 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 means ON
-
time / (ON
-
time + OFF
-
time) = duty cycle.
•
OFF time lower than or equal to the maximum on/off time parameter. This prevents striping and very low
frequencies at low duty cycles.
•
ON time lower than or equal to 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 nozzle. 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 which is the depth of the spray pattern. Maximum cycles speed is 15,000 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 2850+ 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 2850+ 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: AA10000AUH
-
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%
