Instruction manual

IMP I IMP/P I SAM Hot Runner Controllers Instruction Manual
6
Manual Open-Loop Operation
1. Position the mode select switch to open-loop (“ ”).
2. Turn the AC power on.
3. After reset delay, the controller will display the percentage of
output power as adjusted by the power control knob. The
percentage power indicator will be on. Thus 0.00 corresponds
to 0% (no power) and 1.00 corresponds to 100% (full power).
The leftmost digit will display open-loop mode (“ ”).
75% power is shown as 0.75.
Manual Control Pre-Set
The following procedure can be used to pre-set the Manual Power
Control Knob position in the event of a thermocouple break in closed-
loop operation.
A good thermocouple is required to start with, as this procedure
compares the temperature attained using automatic (closed-loop)
control with that obtained using manual (open-loop) control.
When the temperature is the same using either automatic or
manual control, then the position of the Manual Power Control
Knob is correct.
Procedure for Manual Control Pre-Set
a. Adjust controller for closed-loop operation and obtain
good molded parts. This will adjust the controller to the
proper temperature.
b. Position the module select switch to open-loop and set
the manual control knob to roughly 25%. Wait for
10 seconds, than momentarily switch to closed-loop
mode to examine the temperature. If it is above the
setpoint, the manual power is too high to maintain
proper temperature. If it is below setpoint, the manual
power is too low. Adjust the power control knob accord-
ingly, wait for 10 seconds, then re-examine the tempera-
ture by switching momentarily to closed-loop mode.
Repeat this procedure until the temperature is the same
in either automatic or manual control.