REV 4.1 Printed 09/2018
SMS-start
12
SMS-start is able of limiting both the inrush current absorbed from the network, and the
mechanical torque transferred to the load.
During start-up, there is a gradual increase in voltage and torque supplied to the motor, with
constant monitoring of current consumption.
At the end of start-up, there is a power components bypass. This reduces power dissipation and
ensure a high number of starts per hour.
Once powered up and turned on the power components by-pass, a thermal protection of the
device is activate.
It allows dierent operating time according to the absorbed current, as shown in the chart below.
Exeeding the given data will shut down the device.
The deceleration function ensures a gradual reduction in torque, for a “soft” stop.
Starting of the motor takes place following closure of the external run contact (terminals 1-2).
SMS-start starts the motor by initially providing the starting torque set by the TORQ trimmer, and
increasing it up to the maximum torque, in the time set by the ACC trimmer.
Motor deceleration begins on opening of the run command, moving the voltage from the maximum
value to the minimum value, within the time set by the DEC trimmer.
During the starting phase the output current is monitored. On reaching the current limit set by the
IMAX trimmer, the “slowdown” of the acceleration ramp takes place, allowing the motor to rev
without using additional power.
SSV040 SSV070
By pass current Operation time By pass operation time
40A continuos 45A continuos
40A<50A 2 minute 30 sec 50A<60A 8 minute
60A<70A 4 minute
70A<80A 2 minute
ENGLISH
OPERATION
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