Specifications

2
Series RMB Hot Runner Controller Instruction Manual
1.2.3 PID Control with
Autotuning
In normal (automatic) mode each Series
RMB controller uses a single TRIAC
output to implement Proportional-Integral-
Derivative (PID) control. Tuning is
automatic.
By default, the Autotune operation is
executed once. If the Autotune is
successful, then Autotune is disabled.
You can stop the Autotune by pressing the
MODE key. This does not disable the
Autotune feature. If Autotune operation is
set to “once”, then the controller attempts
to perform the Autotune operation each
time the controller is powered up, until a
successful Autotune is completed.
You can disable Autotune entirely or
enable it for every power up. To change
the Autotune setting, use the
Pid menu.
You can also use the Pid menu to change
the proportion band and rate manually;
see 2.4.
1.2.4 CompuStep
™
Soft Start
for Heater Bake Out
All Series RMB Hot Runner controllers
support the CompuStep soft start feature
to extend the life of the heaters and the
molds. The soft start allows slow
dissipation of moisture in heaters by
gradually applying power to the heaters.
When a soft start is executed, phase angle
firing starts at 5% output power and steps
up the output 5% every 30 seconds.
The soft start lasts five minutes or until
the process temperature reaches
200°F (93°C).
The green NORMAL LED flashes during
soft start in normal (auto) mode. You can
stop the soft start by pressing the MODE
key.
By default, a soft start is executed:
• every time the controller starts
and the process value is less than
200°F (93°C), and
• every time the controller is
returned to normal (automatic)
operation and the PV is less than
200°F (93°C).
• any time a ground fault is detected;
see 1.2.7.6
You can set SW2-switch 1 to OFF as
described in Section 3 to cause the
controller to execute a soft start only in
response to detection of a ground fault
interruption. More information about the
start up sequence is in 2.2.
1.2.5 Boost Function
Every Series RMB Hot Runner controller
supports a boost function that is activated
when you press the BOOST key. For the
next 15 seconds (or until you press the
BOOST key again, whichever is sooner),
20% more power is added to the controller
output (100% output maximum).
1.2.6 Process Protection
Features
1.2.6.1 Deviation Alarms
Each Series RMB Hot Runner controller
supports two deviation alarms. If the
process value falls below the setpoint
minus 30°F (17°C), or if the process
value exceeds the setpoint plus 30°F
(17°C), the red ALARM LED on the front
panel of the controller lights. The alarm
status indicator remains lit as long as the
process value deviates from the setpoint
by at least 30°F (17°C).