Instruction Manual
Page 4 of 20
Issue: 3.5
H:\SERVICE MANUALS\FLUID HANDLING\AGITATORS\Agitator Rotary Unit Electric Nord R3.5.doc
Electrical Drives
Inverter Controlled
- The rotational speed of the paddle assembly is controlled by
adjusting the motor frequency range between 20 and 80 Hz by connecting the
electric motor to a suitable AC frequency Inverter Drive.
The speed adjustment is made by control of the Inverter Frequency Output
through manual operation or from a PLC analogue output.
The motor frequency is directly proportional to the agitator rotational speed and
provides an output speed control factor of 4, the gearbox ratio determining the final
output speed. (See specifications section)
If required the speed of rotation can be reduced in proportion to the fluid level in
the tank. It is good practice however, particularly with waterborne paint to maintain
a high fluid level in the mix tank.
Mechanical Variator Controlled –
The
rotational speed of the paddle assembly is
controlled by adjustment of the hand wheel incorporated on the variator/gearbox
unit. The speed control is over a factor of 5, the gearbox ratio determining the final
output speed. (See specifications section)
An optional gravitational indicator can be fitted to the standard handwheel.
Note: The unit must be running to be able to adjust the speed
General -
To eliminate the possibility of any oil contamination into the paint tank
from a failed or leaking gearbox seal a Flinger Plate is incorporated onto the shaft
to direct any oil escape into the support housing. Drainage is through the 1/8
connection, a Ø6 mm hose fitting or similar can be connected to allow any
drainage to be piped away from the tank lid.
In addition a PTFE shaft seal is incorporated in the support housing to prevent any
unintentional ingress from entering from the tank lid.