Motor & Starter Protection
20
2020
20
Over Voltage
Operational after start signal. It trips the starter when
main voltage exceeds the Over Voltage Trip set point
for an adjustable period of time longer than Over
Voltage Delay.
Range: 110 – 125% of Un (Line to Line)
Over Voltage Delay range: 1-10 sec.
Phase loss (with programmable auto reset)
Operational when starter is energized and protects
motor from loss of phase. It trips the starter when one
or two phases are missing. Auto reset can be activated
via Fault Parameters. Auto reset is activated 60
seconds after trip occurred.
Note:
1.
Phase loss might not be detected in lightly
loaded motors.
2.
Auto reset can not be activated if start signal
is still connected.
Phase Sequence
IT trips the starter when starter is energized and phase
sequence is wrong.
Shorted SCR & Wrong Connections
Operational after start signal. It trips the starter if motor
is not properly connected to starter’s Load terminals,
when:
•
Internal disconnection in the motor winding is
detected.
•
In case one or more SCRs have been shorted.
•
Incorrect fiber - optic lead insertion.
Heat-sink Over Temperature
Thermal sensors are mounted on the heat-sink and trip
the starter when temperature rises above 85ºC.
External Fault 1 & 2
Operational when starter is energized. It trips the
starter when an external contact closes for more than 2
sec.
Unbalance Current Trip
Operational after start signal. It trips the starter when
current unbalance increases above the preset
“UNBALANCE TRIP” for more than the
“UNBALANCE DLY” set-point.
Range: 10-100%. Delay: 1-60 sec.
Ground Fault Trip
Operational after start signal. It trips the starter when
ground current increases above the preset “GND Fault
TRIP” for more than “GND FAULT DLY” set point.
Range: 10-100%. Delay: 1-60sec.
Power ON & No Start
Operational upon main voltage connection. It trips the
motor when main voltage is connected to the HRVS-
DN for more than 30 sec. without a start signal.
This protection can be enabled or disabled via the fault
parameters setting menue.
By-pass Open
Operational when the by-pass contactor did not close
after End Of Acceleration contact signaled the pilot
(interposing) relay to close.
WARNING
The over temperature protection is designed to operate
under normal conditions e.g. in the event of extended
low overload.
Incorrect starter selection or o
starting at maximum conditions or repeated starting
under fault conditions can cause SCRs to overheat and
fail before the heat-sink reaches 85º
thermal sensors.
Fault and Reset
When any of the above protection operates, the starter
locks in a fault condition and disables thyristors firing.
Fault LED lights on, fault description is displayed on
the LCD and Fault Relay operates.
•
For local resetting, after fault has been
removed, press Reset Key.
•
Remote resetting can be done through
terminals 7 or 8 (see I/O Programming – page
29).
When Fault occurs followed by a voltage outage, fault
condition is latched and reappears upon voltage
restoration.
Note:
Resetting is not possible when Start signal
exists.
Auto Reset
Under –voltage & Phase-loss
Under-voltage & Phase-loss faults can be set to Auto-
Reset (see Fault Parameters – page 28). The starter will
reset itself 60 seconds after the trip, provided that no
start signal exists.
Auto Reset
Under-current
Under-current fault can be set to Auto-reset (see Fault
Parameters – page 28). The starter will reset itself after
the adjustable “UNDER CUR. RESET” provided that
no start signal exists.
By pass open trip
If By Pass is located in a separate cabinet so after BP is
closed, current measurement is “0” and soft starter trips
and display “BP TRIP”. It is possible to disable this
protection by setting BP open trip to disable (On Fault
setting page).
Note:
Most of the protections after By Pass is closed
can be disable by setting at the fault page
Set curve to 0
– may occur seldom during starting with
special conditions of mains and load. Change start (and
stop if used) curve to 0.
See also fault parameters settings.
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