Instruction manual

IMP I IMP/P I SAM Hot Runner Controllers Instruction Manual
7
Standby Heat (SAM module only)
Standby heat is a low heat level used to keep heaters and associated
equipment warm. Its purpose is to prevent moisture build-up in
heaters and equipment during idle periods and to provide fast start-
up when returning to normal operations.
When using a SAM, activate the standby switch. The SAM will send a
standby command to all controllers. A controller, upon receiving the
command, will respond accordingly to its present mode of operation:
a. If the controller is in closed-loop mode, the setpoint
becomes 200 ºF (93 ºC) regardless of the set
point switch setting. The Remote Standby Indicator
(the decimal of the last digit) will be on, indicating that
the remote standby function is active.
b. If the controller is in open-loop mode, the power out
put is reduced to 1/4 of the value adjusted by the
power control knob. Notice that the % power display
will show the reduced value. The remote standby
indicator will be on.
Faults
1. Over temperature alarm:
A constant over temperature alarm is most likely caused
by a shorted triac in the controller or incorrect or shorted
mold wiring. Switch module power off as quickly as possible
and replace controller or correct wiring error. Check for
thermocouple or heater cross wiring.
2. Under temperature alarm:
Under temperature alarm is normal during system start- up
before the setpoint is reached. If under temperature persists, a
No heat fault will occur.
3. Thermocouple open or reversed:
If any T/C fault is detected during closed-loop operation, the
output power will be cut off. If it is necessary to apply power to
the load during a T/C fault condition, the controller can be