Operation; General Operation; Finding The Proper Agitator Speed; Maintenance - Graco 25C453 Instructions Manual

Operation

To reduce the risk of serious injury, including cuts,
amputation of fingers by the agitator blades, and
splashing in the eyes or on the skin, always shut
off the agitator (power off the VFD) before you
raise, check, or repair the agitator.
Equipment surfaces and fluid that is heated can
become very hot during operation, resulting in
severe burns. To avoid severe burns do not touch
hot fluid or equipment.

General Operation

Use the VFD to start, stop, and adjust the agitator
speed. See manual 3A4739 for Graco supplied VFD
operating information.
To connect the power to the agitator, see
Electrical Connections, page 8
power supply before checking or servicing the
agitator.
Activate the agitator to mix fluid thoroughly before
supplying fluid to the dispensing equipment. Continue
mixing fluid while the dispensing equipment is being
supplied.
NOTE: Always use moderate agitation speeds;
excessive agitator speed may cause vibration,
foaming of fluid and increased wear on parts.

Finding the Proper Agitator Speed

1. Fill the fluid supply container to about 3 or 4
inches (75 to 100 mm) above the agitator blade.
2. Start the agitator and gradually increase the
speed until a vortex begins to form in the fluid.
3. Reduce the speed slightly, then fill the fluid
container.
If using a Graco supplied VFD, the agitator speed
can be calculated by using the formula below.
Example 1: (AIB) x C = D
Example 2: (10 hz I60 hz) x 1725 rpm = 292 rpm
A VFD Frequency
B Motor Frequency
C Motor Speed
D Agitator RPM
3A4553A
. Disconnect the

Maintenance

Moving parts, such as an impeller blade, can pinch
or amputate fingers. To reduce risk of injury or
damage to equipment, always disconnect power
from the agitator before performing maintenance
or service.

Check Screw and Bolt Tightness

Within the first two weeks of operation, check all cap
screws and set screws to make sure the screws are
tightened. Retighten as required.

Routine Periodic Maintenance

Check and retighten all cap screws every six months
or during down times if they occur more frequently.
Operation
9