Instruction Manual ND IM 3 JAN 2017
Instruction Manual
IM ND 3 JAN 2017
Page 20
CODE
CHECK
CONDITIONS
SOLUTIONS
M
(2) Temperature controllers for
heaters
Adjustment incorrect:
Not controlling properly:
Heater over temperature shuts down system & red
light “Heater Overtemp” is on.
•
Re-check process air set points per section 4
•
Check for loose wiring.
•
Check thermocouple for proper operation,
tightness & correct installation (replace if
required).
•
Auto Tune controller(s) per instructions at end of
section.
•
See over temperature settings in section 1.
Readjust deviation alarm per instructions in sect. 9
(if req.) or thermostats (if supplied).
•
Low compressed airflow (see sections F, G, H, I).
•
To reset heaters, when the heaters have
cooled, turn power on & off using the on/off
switch.
N
Lower & Upper air pressure
regulators inside of box.
Regulators out of adjustment resulting in incorrect
air flow to hopper. Low airflow causes inadequate
drying & high airflow may cause the heaters to
deliver air at too low a temperature.
Refer to the set points on the label inside the box.
O
LOWER orifice
Orifice plugged with material. This is a hex shaped
brass fitting screwed into air inlet of LOWER heater
(H1).
Remove the orifice & clean out the particles (if
required).
P
Upper & lower screen in hopper.
Screens are clogged with material.
Screens are positioned incorrectly and not
straight.
Remove & clean (see General Inspection section on
p4 for the proper position of this screen).
See General Inspection section on page 4 for the
proper position of this screen.
Q
Material level in hopper.
Low material level in hopper reducing the drying
efficiency.
Make sure the material level in the hopper is always
at least 75% full and preferably 100% full.
R
Initial moisture content in the plastic
material being dried.
Higher than normal moisture content of the
material being loaded into the hopper is
reducing the Dryer efficiency.
The material being dried should be sealed until it is
ready to be dried, to keep it from picking up additional
moisture from the atmosphere.
S
Heater housing Thermostat(s) – if
supplied
Adjustment incorrect causing the heaters to turn
off & lock out.
Re-check the set point (see the set point on page 4).
Re-adjust the thermostat if required.
