Sterlco ST500 Series Central Granulator - Manual (Page 80)

80
TROUBLESHOOTING
SECTION 7-2
Processing Faults
PROBLEM
Processing Faults
PROBABLE CAUSE REMEDY
A. Material building up below
screen
1. Pneumatic discharge blower
not running
1. Start the blower
2. Damper on discharge
blower not open enough
2. Adjust the damper (on
opposite side of machine from
blower)
3. Damper line is blocked 3. Open line and remove block
B. Stalling 1. Overfeeding 1. Reduce feed rate
2. Partial or complete screen
blockage
2. Remove screen, clear and
inspect for damage
3. Insufficient tension on V-
belt drive, slippage and
burning
3. Check belt tension and
adjust as required
4. Badly blunted or damaged
knives
4. Install re-sharpened or new
knives as required
5. Knife gap setting is too
wide
5. Check knife gap clearances
6. Installation fault, motor is
running in reverse direction
6. Check direction arrow and
reset electrical connections to
correct rotational direction
7. Safety interlock is
inoperative
7. Tighten safety interlock
actuator screw
C. Material overheating 1. Check items 1, 2, 4, 5 and 6
under “Stalling”
1. Follow remedies listed for
each item
2. Screen size is too small 2. Increase the screen size
3. When feeding the material,
bed knife shield on rotor down
stroke is incorrectly set
3. Check bed knife projection
beyond shield. Set it to 1-2”
(0.80 mm) for film and 1/16”
(1.6 mm) or thicker materials
4. When granulating rubber,
insufficient talc, causing
freshly cut surfaces to re-
adhere
4. Increase talc percentage rate
of feed
5. Blockage in pneumatic
discharge line
5. Check direction of blower
rotation. Check venturi and
line/or transition piece for
blockage