52
Control Keypad
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7.7.2
Phase Sequence
Becomes operational when starter is energized, provided this protection has been activated, trips the starter
when phase sequence is wrong.
Refer to section
7.6.8 on page 45 parameter PHASE SEQ. Y/N.
7.7.3
Shorted SCR or Wrong Connections
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when Internal disconnection in the motor winding is detected, or when one or more SCRs have been shorted.
7.7.4
Heat-sink Over Temperature
Thermal sensors are mounted on the Heat-sink and trip the starter when 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
±
fan stoppage or air flow blockage.
Incorrect starter selection, frequent starting at max. conditions, or repeated
starting under fault conditions can cau
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the heat-sink reaches 85°C to trip the thermal sensors.
7.7.5
External Fault
If Aux. Input contact - C1 is programmed as an External Fault (Refer to section
7.6.9.1 on page 48 for details
on programming Input C1), the RVS-DXM will trip if contact closes for more than 2 sec.
External Fault becomes operational when starter is energized.
7.7.6
Fault and Reset
When any of the protections operate, the starter locks in a fault condition, disabling thyristors firing. Fault LED
lights up, 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 Aux. Input, if programmed as REMOTE RESET. (Refer to section
7.6.9.1 on page 48 for details on programming Input C1)
When Fault occurs, followed by a voltage outage, fault condition is latched and reappears upon voltage
restoration.
Note:
Resetting (Local, Remote, Serial Link or Auto Reset) is not possible as long as
Start
signal exists.
7.7.7
Auto Reset
UNDER VOLTAGE and PHASE LOSS, faults can be set to Auto-Reset (Refer to section
7.6.8 on page 45).
The starter will reset itself 60 seconds after voltage was fully restored provided no start signal exists.
UNDER CURRENT fault can be set to Auto-Reset (Refer to section
7.6.8 on page 45).
The starter will reset itself when a programmed time delay has elapsed provided no start signal exists.
