JUMO 709062 TYA 202 - Three-Phase Power Controller Operating Manual - Manual (Page 71)

2012-12-31/00561073 [SCR power switch TYA202] 69
6 Special device functions
6.1.1 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 status) 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 oper-
ating point has been reached that it is now to perform the Teach-In.
This is possible in the operator level or in manual mode.
v Chapter 4.2.4 "Monitoring"
v Chapter 6.2.2 "Configuring the Teach-In (prerequisite for Teach-In in man-
ual mode)"
The Teach-In values are then permanently saved. It is not necessary to per-
form the Teach-In again when the power controller is switched off and on
again.
The 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 factory setting is ap-
plied. The Teach-In is not affected by reconfiguration of other parameters.
If "Manual Teach-In" has been configured but no Teach-In has been conduct-
ed, the message "Teach In load monitoring!" appears on the display as a re-
minder. Manual Teach-In can only be performed on the device itself, not via
the setup program.
Teach In
"Automatically
once" "Automatically once" means that the Teach-In values are temporarily saved af-
ter each power ON. This setting is only suitable for heating elements with a
temperature coefficient TC = 1.
When the power controller is disconnected from the supply voltage, the
Teach-In values detected last are deleted again. After another power ON, the
load monitoring therefore remains inactive until the new Teach-In is performed.
To ensure that the load ratios for later operation are recorded precisely, the
Teach-In is only performed in phase angle control at a load current of at least
30 % of the rated value. (In burst-firing mode, this restriction is not necessary
because a sufficiently high current always flows when the SCR is fired. In this
case, the Teach-In is always performed shortly after a power ON or - if config-
ured - after the soft start.)
H
From software version 256.01.08, the determined Teach-In values are also
transferred when the setup data of one power controller is transferred to an-
other.
H
To ensure that the load ratios for later operation are recorded precisely, only
perform the Teach-In at a load current of at least 20 % of the rated value.