JUMO 709051, Operating Manual, Page: 66 / 92

6 Special device functions
66 V1.00/EN/00741192/2021-03-30 [IPC 300]
6.2.1 Teach-In
Depending on the configuration of the parameter "Load monit. Teach-In",
Teach-In (i.e. determination of the load measured values in the OK state) is ei-
ther performed once automatically after power ON or automatically and cycli-
cally, repeatedly every minute, or manually.
"Manual"
teach-in For "Manual Teach-In", the power controller must be told once after the work-
ing point has been reached that it is now to perform the Teach-In.
This can be performed in the operating level or in manual mode.
v
Chapter 4.2.5 "Binary inputs"
v
Chapter 6.3.2 "Configuring Teach-In (prerequisite for Teach-In in manual
mode)"
In this variant of Teach-In, the Teach-In values are then permanently saved.
Teach-In does not need to be performed again
when the power controller is switched off and on again.
Teach-In can be repeated whenever necessary. The old Teach-In values are
then overwritten by the new ones.
The Teach-In values are only deleted if the load monitoring Teach-In parameter
is explicitly configured to "Manual Teach-In" or when the default setting is ap-
plied. Teach-In is not affected when other parameters are reconfigured.
If there has not yet been a correct Teach-In process, the message "Teach-In
missing" appears on the display as a reminder.
"Manual Teach-In" can only be performed on the device itself, not via the set-
up program.
Teach-in
"Automatically
once" "Automatically once" means that the Teach-In values are temporarily saved af-
ter each power ON. This setting is suitable only for heating elements with a
temperature coefficient TC
≈
1.
When the power controller is disconnected from the mains voltage, the Teach-
In values are deleted again. After another power ON, load monitoring therefore
remains inactive until a new Teach-In process is performed.
To ensure that the load ratios are recorded precisely for later operation, Teach-
In is only performed with at least 30 % of the output level.
Teach-in
"Automatic (cy-
clically)" "Automatically (cyclically)" means that the Teach-In values are temporarily
saved again at intervals of one minute. This setting is particularly suitable for
SiC heating elements as in this case the resistance in the load point changes
Teach-In is not possible during the soft start phase (which can last for an extend-
ed period due to active current limiting).
The determined Teach-In values are also transferred when the setup data of one
power controller is transferred to another.
To ensure that the load ratios are recorded precisely for later operation, only per-
form the Teach-In process at a load current of at least 20 % of the nominal value!