I651
GB
03
22
31100488
19
20 COORDINATION TABLES
20.1 COORDINATION WITH LINE CONTACTOR
The line contactor installed upstream the soft starter is strongly suggested to open the circuit in the event of an anomaly on the plant (e.g. short circuit, overload, alarm, etc.) and to protect the internal thyristors
against undesired phenomena which may affect the power supply line (e.g. overvoltages or uncontrolled current peaks) when the motor is not required to start.
The command of the line contactor is done with a relay output of the soft starter ADXN, programmed with the dedicated function LIN.CONT. (line contactor), which remains active from the starting command up to the
end of the deceleration ramp (if enabled).
The line contactor must be sized with an AC-3 current greater or equal than the motor rated current.
The following table shows the line contactor suggested for each size of ADXN soft starter.
SOFT STARTER Ie [A] LINE CONTACTOR
ADXN..006... 6 BF09 (9A AC-3)
ADXN..012... 12 BF12 (12A AC-3)
ADXN..018... 18 BF18 (18A AC-3)
ADXN..025... 25 BF25 (25A AC-3)
ADXN..030... 30 BF32 (32A AC-3)
ADXN..038... 38 BF38 (38A AC-3)
ADXN..045... 45 BF50 (50A AC-3)
Note. The code of the contactor must be completed with the coil voltage. For the complete code refer to the Chapter 2-Contactors
of the Lovato Electric general catalog.
20.2 COORDINATION WITH THERMAL OVERLOAD RELAY (ADXNB AND ADXNF)
The soft starter type ADXNB and ADXNF don’t integrated the function of motor thermal overload protection, which is present instead in the advanced soft starter type ADXNP.
For the protection of the motor against overload it is suggested the installation of a thermal overload relay (in alternative to a motor protection circuit breaker), typically installed upstream the soft starter, connected to
the line contactor.
The following table shows the thermal overload relay suggested for each size of ADXN soft starter.
Note! The selection of the correct thermal overload relay must be done according to the rated motor current (In) indicated on the motor nameplate, which could be lower compared to the rated current of the soft
starter (Ie). Choose a thermal overload relay which includes the rated motor current in its adjustment range.
SOFT STARTER Ie [A] THERMAL OVERLOAD RELAY ADJUSTMENT RANGE [A]
ADXN...006... 6 RF380650 4...6.5
ADXN...012... 12 RF381400 9...14
ADXN...018... 18 RF381800 13...18
ADXN...025... 25 RF382500 20...25
ADXN...030... 30 RF383200 24...32
ADXN...038... 38 RF383800 32...38
ADXN...045... 45 RF825000 35...50
For more information about thermal overload relay see the Chapter 3-Motor protection relays of the Lovato Electric general catalog.
G
B
Soft starter
ADXN...
Line contactor
BF...
Line contactor
BF...
Thermal overload
relay RF38...
Soft starter
ADXNB...
or ADXNF...
(
*
) WARNING!
In case of use of thermal relay type Lovato RF38, cut off the copper pin as shown in the image below.