User's Guide
Power Transducer
Review I
KRON Instrumentos Elétricos
17
Product Installation
1. Transducer fastening
The first step for the product installation is fastening it to a panel background
with four screws in the proper dimensions, as indicated in the product's dimension.
Regarding electrical connections, it is recommended the use of eyelet terminals
with proper dimensions for M3 screws.
2. External supply signals connection
The next step is connecting the product's external supply, as indicated in its
front panel. For direct current supply, it is important to respect the indicated polarity
(+ and -).
It is recommended the use of a 0.250mA external fuse as protection of the
transducer's external supply.
It is recommended the use of wire with 1.5mm² minimum rated section.
3. Voltage signals connection
The voltage signals connection (directly or through VT) should be done in the
indicated terminals according to the transducer's wiring diagram.
It is recommended the use of a 0.250mA external fuse as protection of the
transducer's voltage inputs. It is also recommended the use of terminal blocks,
allowing to move the transducer (for a future calibration and/or possible maintenance)
without the need of turning the system off.
It is recommended the use of wire with 1.5mm² minimum rated section.
4. Current signals connection
The current signals connection (directly or through CT – current transformer)
should be done in the indicated terminals according to the transducer's wiring diagram.
In case of using CTs, they should be for measurement, and never for protection,
as these not only send high current to the transducer's input in short circuit conditions,
but also have no accuracy class for measuring power.
Protection fuses should never be used in the current input, as in the event of
over-current they would trip the CT output circuit, possibly causing damage to it. As
well as in the voltage part, the use of terminal blocks is recommended.
The rated section of the wire to be used should consider the transducer's rated
current (1Aac or 5Aac), the distance to the CT and the CTs' rated burden. Commonly
are used 2.5mm² or 4mm² section cables.
