Instruction manual

IMP I IMP/P I SAM Hot Runner Controllers Instruction Manual
5
is 30 ºF (17 °C) or more above setpoint, the over
temperature alarm display (upper segment of the leftmost
digit) will flash. During alarm conditions, temperature display
will also flash. If the temperature is within alarm limits, the
display will stop flashing, and the leftmost digit will display
closed-loop mode (“ ”).
5. Power to load indicator (the decimal point of the leftmost digit)
will be on if any power is being applied to the load.
6. When any of the T/C faults are detected, output power will be
cut off automatically and the temperature display will be
blanked out. The leftmost digit will show “ ” for (T/C open),
“ ” for (T/C reverse) or “ ” for No Heat and flash twice per
second.
Automatic Operation with CompuStep system
When starting from cold, it is recommended that the CompuStep
system be used to lengthen heater life considerably.
1. Position the mode select switch to CompuStep mode (“ ”).
2. Set the desired temperature on the setpoint switch.
3. Turn on the AC power.
4. After reset delay, the measured temperature will be displayed.
If temperature is less than 200 ºF (93°C) the controller will
enter the CompuStep mode. This is indicated by the step
symbol “ ” on the leftmost digit. During this mode, the
controller gradually increases power to load in small steps.
After 5 minutes or when the temperature reaches 256 ºF
(124 °C), the controller will exit from CompuStep mode and
automatically go to setpoint. Any thermocouple faults detected
during the 5-minute interval will cause the CompuStep mode
to end prematurely. A standby command from a SAM module
will also terminate CompuStep mode. When CompuStep ends,
the controller will operate as described in the Automatic
Closed-Loop Operation section. If temperature is above
200 ºF (93°C), controller will bypass CompuStep and go
directly to setpoint.