81 • Motor and Soft Starter Protection
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Note that obtaining DEFAULT PARAMETERS erases all previously modified settings and requires the
operator to reprogram all parameters that differ from the factory default.
Note
: It is especially important to reprogram the RATED LINE VOLTAGE and STARTER FLC (as shown on
the label of the HRVS-DN) and all other parameters in MAIN & PROTECT mod page. Refer to section
7.8.2
page 55.
8.2.5
S. SCR OR WR. CON
Operational after start signal. Trips if the motor is not properly connected to HRVS-DN’s load terminals, when:
Internal disconnection is detected in the motor winding
One or more of the SCRs have been shorted.
Incorrect fiber optic leads connection
This protection is not active when SOFT START CURVE 0 is selected.
Check with an ohmmeter between L1-U, L2-V, L3-W; resistances are listed on section
14.1 page 120.
Check for no voltage on terminals U, V, W (from parallel system or an independent bypass).
SCRs may fail due to:
High short current not protected by proper fuses.
High voltage spikes not protected by proper external Varistors.
Frequent starting at maximum conditions or fault conditions.
For SOFT START CURVE 0 setting refer to section
7.8.2 page 55.
8.2.6
OVER TEMPERATURE
Thermal sensors are mounted on the heat-sinks of the Power Section and trip the HRVS-DN when the
temperature rises above 85ºC.
WARNING!
The over temperature protection is designed to operate under normal conditions, e.g.,
in the event of extended low overload, insufficient ventilation due to fan stoppage or air
flow blockage.
Incorrect HRVS-DN selection, frequent starting at max. conditions, or repeated starting
under fault conditions can cause the SCR to overheat and fail before the heat-sink
reaches 85°C thereby causing the thermal sensors to trip the HRVS-DN.
8.2.7
EXTERNAL FAULT 1 & EXTERNAL FAULT 2
External Faults becomes operational when HRVS-DN is energized.
The HRVS-DN will trip if contact between terminals 19 and 21 closes for more than 2 sec.
8.2.8
COMM. PORT FAILED
Trips the HRVS-DN if, when controlled via Profibus communication link, the communication cable is torn or the
communication from the PLC is lost.
Note that the occurrence of this fault depends on then “Watch Dog” function of the Profibus controller.
You must reconnect the wiring and/or the communication with the PLC and wait for a start command initiated
by the PLC.
8.3
Fault and Reset
When any of the above protections trip (except INSULATION ALARM), the HRVS-DN locks in a fault condition
thus disabling firing of the thyristors.
Fault
LED lights, fault description is displayed on the LCD and the fault
relay operates.
For local reset, after fault has been removed, press
Reset
key.
Remote reset can be performed through terminals 7 or 8 (see I/O PROGRAMMING section
7.8.7
page 73).
When a fault occurs, followed by a voltage outage, the fault condition is latched and reappears upon voltage
restoration.
Note:
Reset (Local, Remote, Serial Link or Auto Reset) is not possible as long as the
START
signal exists, except
for UNDER CURRENT trip.
