Pt100 Probes Electrical Connections; Other Electrical Connections; Relays Functionality - QUANTA DQ61 User Manual

5.5 Pt100 probes electrical connections

Make Pt100 sensors connections as shown in the following diagram, using shielded cables:
(Figure 4 shows the connection of the single P1 probe). If they are available two-wire Pt100, connect terminals
6 and 7 together.
Do the same with the other probes, connecting to terminals 8 to 16 with the screens connected to terminals 2, 3
and 4.
The probes P1, P2 and P3 are those which measure the temperature of the three windings in a three-phase
transformer, while the probe P4 measures the temperature of the magnetic core. See the diagram below:

5.6 Other electrical connections

Connect the low safety voltage power supply to terminals 21 and 22 or connect the mains supply to terminals
23, 24 and 25.
WARNING: even if the power supply applied to terminals 21 and 22 is at low safety voltage levels, the ground
terminal 24 must be connected, in order to maintain the effectiveness of noise filters and other internal devices.

5.7 Relays Functionality

The relays A1 A2 and A3 are normally at rest, while the relay A4 is normally activated, according to the
diagrams of example in Figure 6 and Figure 7.

The output A1 (signaled by LED FAN) switches when one of the sensors reaches the activation
temperature of the fan.
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Pt100
Pt100 P4
Pt100 Pt100
P1 P2
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Pt100
Figure 4
Pt100
P3
DQ61
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4
Figure 5
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