13
4.4.2
THE INTA/1 AND INTA/5 INTERFACES
Note: one of the CT terminals is normally connected to a common ground (see fig. 4.9).
When using the INTA/1 and INTA/5 interfaces, bear in mind that there is no galvanic separation so that the
instrument’s ground is actually connected directly to the plant.
You must therefore make sure that there are no spurious voltages between the plant ground and the instrument’s
grounds and that no other conditions which could cause damage to the instrument exist
In these cases, use an insulating transformer (fig. 4.10), or three SEPA 5X1 interfaces (code 4AAER) available in the
ELCONTROL ENERGY accessories catalogue.
L1
L2
L3
L1
L2
L3
Fig. 4.9
L1
TA (uscita 5A)
TA 5/1
INTA/1
LOAD
(T) L3
(S) L2
(R) L1
SEPA 5X1
N
Fig. 4.10
