AEG Electrolux EFT 520 Operations Instructions download pdf (Page 20)

FIG. 11 RELAY K4

9.4 GENERAL (PURPOSE)

Voltage regulation in local networks – also see Chapter 1: General Description

9.5 ON SITE POWER SUPPLY OF THE Thyrobox VR

For the on site power supply of the Thyrobox VR (for activation, measurement, regulation, for

monitoring and internal notiﬁcations) the Thyrobox VR takes its auxiliary supply directly from the

local network; 3/PEN, 230 VAC, 10 A.

For service purposes a Euro plug socket (X20) with 10 A fuse is installed in addition which makes

230 VAC available.

9.6 SWITCHING ON AND OFF

Switching the Thyrobox VR on takes place under adherence to and in accordance with the information

in Chapter 11, Commissioning. For switching off the necessary information is contained in Chapter

13, Decommissioning. Switching the Thyrobox VR on and off via remote control is not possible with

the standard set-up.

9.7 TEMPERATURE MONITORING

Cabinet:

•

Temperature capture system with a sensor PT1000 built into the interior of the cabinet captures the

interior temperature of the Thyrobox VR and activates the front fan via the Thyro-P control device

A11.

Transformer:

To protect the transformers, temperature sensors are built in. There are two activation thresholds:

• at rst threshold (CT1.1, CT2.1, CT3.1) a relay switches the front fan on.

• at second threshold (CT1.2, CT2.2, CT3.2) the sensor switches the input of the relevant Thyro-P

control device, which then sets the regulator stop of the phase in question and deactivates the re-

gulation of this phase (current ﬂow is retained in this phase, however, without voltage regulation).

9.8 SAFETY DEVICES

9.8.1 LIGHTNING CURRENT AND SURGE ARRESTER

The integrated lightning current and surge arrester (F2) serves to discharge overvoltages and over-

currents.

9.8.2 TRANSFORMER PROTECTION

Surge and attenuation elements are in place to protect the transformers.

fan test by

manual operation of K4

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AEG Electrolux EFT 520 Operations Instructions Page 20