6 • Technical Data
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3.6
Soft starter protections
3.6.1
Electronic Overload
The built-in inverse time electronic overload becomes operational after 15 seconds. (This is the maximum
starting time of the Solstart Plus).
Trip current is factory set to 115% of Motor Full Load Current (from the setting on Motor FLC potentiometer),
E.g. In order to increase the O/L trip point increase FLC setting above the calculated level.
Electronic overload curve
When this protection activates Overload LED on the front panel will lit.
3.6.2
Phase Loss
The protection becomes operational when the starter is energized.
it protects the motor from single phasing. It will trip the starter when one or two phases are missing for more
than 1 sec.
When this protection activates Fault LED on the front panel will lit.
3.6.3
Under voltage
The protection becomes operational when the starter is energized.
it protects the motor from under voltage. It will trip the starter when under voltage condition occurs for more
than 1 sec.
When this protection activates Fault LED on the front panel will lit.
3.6.4
Heatsink over temperature protection.
The protection becomes operational when the starter is energized.
it protects the soft starter from over heating.
A thermal sensor mounted on the heatsink trips the starter when its heatsink temperature rises above 85ºC.
When this protection activates fault LED on the front panel will
flash.
3.6.5
Fault Logic and Reset Circuits
Upon operation of any protection, the starter locks in a fault mode, disabling thyristors firing and opening the
Bypass. The proper fault indication LED lit/flash and the Fault contact closes.
To reset the starter, after the fault has been removed, press Reset button on starter's front panel or disconnect
control voltage.
WARNING!
When Fault occurs make sure that Discrete Input Voltage (terminals 3, 4) is
disconnected otherwise upon Reset the motor will start immediately!!
1
10
100
1000
0
2
4
6
I(Load)/In
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