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V2.00
19837_EDEBD
A0227-2620-1_EN
9
Functions
Alternatively, this serial interface can also be accessed via Modbus (RTU) . A detailed de-
scription can be found in the “Modbus data point description,” available separately .
Please also observe the following notes on start-up and operation:
In case of operation in a 3-wire network, a zero-point creator is required (e .g . 700/100 V
AC, primary 3-phase connection, available from KBR), as the controller needs a neutral
conductor for trouble-free operation .
For operation as a single-phase measuring controller, the measuring current must always
be connected at the terminals 20 und 21 (k1 and l1) . After changing to single-phase oper-
ation, you can configure the phase shift between the measuring current and measuring
voltage (menu Commissioning / Transformer / Main current transformer) .
In this case, the measuring voltage must be connected to terminals 10 (L1) and 13 (N) .
For this operating mode, the compensation system only may have 3-phase stages, as
single-phase measurement is projected to 3-phase operation .
If the measuring current is taken from a phase other than the measuring voltage, this
shift can be adjusted under the menu item Extra / Commissioning / Transformer / Main
current transformer / Phase I (0°, 120°,240°)
The following settings are possible:
U L1, I
L1
=
0°
U L2, I
L2
=
0°
U L3, I
L3
=
0°
U L1, I
L2
=
120°
U L2, I
L3
=
120°
U L3, I
L1
=
120°
U L1, I
L3
=
240°
U L2, I
L1
=
240°
U L3, I
L2
=
240°