Specifications

14
Series RMB Hot Runner Controller Instruction Manual
5.7 Heater Current
Monitoring
The present current output to the heater,
expressed to the closest tenth of an amp,
is always displayable in the lower line.
Cycle through the available lower line
display items using the DISPLAY key.
The controller constantly checks heater
current readings to ensure that they
correlate with output activity.
• If the output is off and a current flow
greater than 0.1 amp is detected,
then the controller posts a “TRIAC
short” error.
• If the output is on, but no controller
current output flow is detected, then
the processor posts a “bad heater”
error. (This condition is checked only
if no loop break has been detected
while the controller is in normal (auto)
mode, and the PV is not within the
proportional band.)
If either of these error conditions is
detected:
• the output failure interruption relay
breaks the connection between the
controller’s TRIAC output and the
heater, and
• controller processing stops, and
• the red ALARM LED lights (all other
LEDs off), and
• an alarm message is displayed on
the lower line:
• if a short was detected,
Out
alternates with SHrt
• if a heater problem is detected, bAd
alternates with Htr
The controller remains in this halted state
until you cycle power to the controller.
5.8 Autotune Errors
At the conclusion of an unsuccessful
Autotune, you will see Er plus a one-digit
error code (alternating with tun). If the
Autotune is not successfully completed,
the Autotune feature is not disabled
automatically.
An Autotune error code is displayed until
you press the MODE key. If the Autotune
operation is terminated by the controller
because of an error condition, the
controller output goes to 0%.
Autotune Errors
Error Code Description
Er3 Setpoint is higher than the process value. Look at the setpoint.
If it is realistic for your process, then check the thermocouple
leads; maybe they are reversed.
Er5 There is not enough difference between initial PV and the
setpoint. For Autotune to work, the difference must be at least
9°F (5°C).
Er8 The startup curve (change in PV) was not acceptable to the
Autotune algorithm. This could be caused by a process upset
that occurred during tuning. Try Autotuning again when the
process is stable. If the error recurs, your process is not
suitable for Autotuning. Use manual tuning; see 2.4.
Er9 The Autotuning timed out, because the process was
unresponsive (or extremely slow). Your process is not suitable
for Autotuning. Use manual tuning; see 2.4.