Operating instructions

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4.2 Power supply for the control device
The control device is supplied directly from the power section (terminals U1,
X1:1.2). This voltage also serves as mains synchronization. The mains connection is
equipped for input voltages of Unom – 15% to +10% and nominal frequencies of
47Hz to 63Hz. Both terminals (X1:1.2 1.5mm
2
grid 3.81) are internally bridged. If
a phase is connected to X1, a fused connection is necessary (figs. 3,7).
4.3 Pulse lock
The pulse lock (PULSE INHIBIT; terminals X2.1 - X2.2 1.5mm
2
, grid 3.5) is activated
by opening the pulse-lock bridge, i.e. the power section is no longer triggered. If the
pulse lock is activated the LED “PULSE INHIBIT” lights up red. It is imperative to use
the pulse lock with transformer load in order to activate the Soft Start function. It may
only then be released when there is a voltage supply to the power section. With
Thyro-A 2A the pulse lock is only wired to the master (L1, left).
4.4 Analog set point value input
The set point value input (terminal X2: 3 ground - X2:4 + 1.5mm
2
grid 3.5) is
suitable for process controllers with output signals of 0(4) - 20mA, 0-5V, 0-10V.
4.5 Digital set point value input
Under certain conditions terminal X2.7 can be used as additional digital “set point
value input” (24V d.c.) so that, for instance, Thyro-A can be triggered by a 2-point
regulator. Further information is available on this in chapter 3.2.1.
4.6 Voltage transformer
The load voltage is recorded by the measuring signal given by the supply voltage. This
value is linked with the control angle  or the pulse ratio U
rms
= U
mains
* √ (T
S
/T
o
). The
voltage transformer only has local mode wiring.