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4.10 CURRENT TRANSFORMER
ATTENTION
By standard, each power section of the Power Controller has a current transformer. When using
external current transformers, for instance on the secondary side of a transformer, these must be
connected to the terminals X7.1 and X7.2 and terminated using a burden resistor! The burden
resistor must be designed so that at nominal current a voltage drop of 1.0Vrms occurs at the bur-
den resistance. For connection, take care to have the respective correct phase angle.
The internal current transformers may not be shunted, because the burden resistor R 40 is on the
control cards. If load current monitoring of the phase 2 (not controlled) is desired for Thyro-P 2P,
then an external current transformer and an external voltage transformer must be provided for
this purpose.
CURRENT TRANSFORMER TERMINAL X7.2 TERMINAL X7.1
phase L1 .11(k) .12(l)
phase L2 .21(k) .22(l)
phase L3 .31(k) .32(l)
TAB. 15 CURRENT TRANSFORMER
The following parameters must be checked or adjusted:
HARDWARE PARAMETER
current transformer xxxxx UE_I
type current xxxxx I_TYP
burden resistance xxx,xx R_BUERDE_I
LIMITATIONS
Irms maxI1 xxxx A IEMA
REMARK
Current measuring in not-controlled phases
Thyro-P 2P
Although phase 2 is not controlled in Thyro-P 2P, it is possible to take measuring values during this
phase. A current transformer corresponding to T1 must be used and burdened (see type overview).
It is connected as in table 23 to X7.1.22 – X7.2.21.
Thyro-P 1P
As only phase 1 is controlled with Thyro-P 1P, the measuring systems of phase 2 and 3 can be used
freely. The corresponding current transformers (with max. 1V at nominal current) must be applied
and burdened. Connection is carried out as in table 23 to terminal strips X7.1.22 – X7.2.21 for
“phase 2”, and to X7.1.32 – X7.2.31 for “phase” 3.
The measuring values given do not infl uence the controller and are available for Bus interfaces,
display and analog outputs. Parameter values must not be changed.
4.11 VOLTAGE TRANSFORMER
As standard, each power section is fi tted with a voltage transformer for recording the load voltage.
It is possible to measure voltages of up to 690V. The voltage transformers are wired to the control
device A70 by the works.
LOAD VOLTAGE TERMINAL X7.2 TERMINAL X7.1
phase L1 .15 .16
phase L2 .25 .26
phase L3 .35 .36
TAB. 16 VOLTAGE TRANSFORMER