GE Industrial Solutions ASTAT BP - Manual (Page 45)

ASTAT BP User Manual
45 GE Industrial Solutions ©2013 GE Company All Rights Reserved
44..88 Non Adjustable Protection and Fault Reset
4.8.1 Under/Over Frequency
Operational when the ASTAT-BP is energized and protects the motor when the frequency is less than 45 or
greater than 65Hz.
4.8.2 Phase Loss
Operational when the ASTAT-BP is energized, provided this protection has not been de-activated. Phase loss
protection trips the ASTAT-BP when 1 or 2 phases are missing.
Refer to section 4.7.7 on page 37 parameter Phase Loss.
4.8.3 Phase Sequence
Operational when the ASTAT-BP is energized, provided this protection has not been de-activated. Phase
sequence protection trips the ASTAT-BP when phase sequence is wrong.
Refer to section 4.7.7 on page 37 parameter Phase Sequence.
4.8.4 Wrong Connection
Operational after start signal. Trips if motor is not properly connected to the ASTAT-BP’s load terminals, when
internal disconnection is detected in the motor winding.
This protection is not active when D. Set.:Generator Parameters is selected.
4.8.5 Shorted SCR
Trips the ASTAT-BP if one or more of the SCRs have been shorted.
This protection is not active when D. Set.:Generator Parameters is selected.
4.8.6 Heat-Sink Over Temperature
Thermal sensors are mounted on the heat-sink and trip the ASTAT-BP when the temperature rises above 85 °C.
CAUTION The over temperature protection is designed to operate under normal conditions,
i.e., in the event of extended low overload, insufficient ventilation due to fan
stoppage or air flow blockage.
Incorrect ASTAT-BP 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 ASTAT-BP.
4.8.7 External Fault
If PROG.Input C1 is programmed as an External Fault (Refer to section 4.7.8 on page 39 for details on
programming Input C1), the ASTAT-BP will trip if contact closes for more than 2 Sec.
External Fault becomes operational when starter is energized.
4.8.8 Fault and Reset
When any of the above protection trips, the ASTAT-BP locks in a fault condition, disabling firing of the thyristors.
The Fault LED lights, the fault description is displayed on the LCD and the fault relay operates.
• For local reset after fault has been removed, press the Reset key.
• Remote reset can be performed through Auxiliary input C1 (see I/O Settings Parameters section 4.7.8
page 39).
When a fault occurs followed by a voltage outage, the fault condition is latched and reappears upon voltage
restoration.