GE Industrial Solutions ASTAT BP User Manual
Page 57
ASTAT BP User Manual
57
GE Industrial Solutions
©2013 GE Company All Rights Reserved
Overload
Trips the ASTAT-BP when current exceeds the Overload Trip level and the
thermal register has filled up.
Check
Motor Current, Starter Current settings and overload settings
and check motor current, then wait at least 15 minutes to let the motor and
ASTAT-BP cool down before restarting.
For protection parameters settings refer to section 4.7.2 page 26.
Undercurrent
FLT
Trips the ASTAT-BP when line current drops below the preset level for the preset
time.
Check
Undercurrent FLT and Undercurrent DLY settings; check line
currents of L1, L2, L3.
For protection parameters settings refer to section 4.7.2 page 26.
Undervoltage
Trips the ASTAT-BP when line voltage drops below the preset level for the preset
time.
Check
Undervoltage FLT and Undervoltage DLY settings, check line
voltages on L1, L2, L3. When voltage drops to zero, the ASTAT-BP trips
immediately with no delay.
For protection parameters settings refer to section 4.7.2 page 26.
Overvoltage
Trips the ASTAT-BP when line voltage increases above a preset level for a preset
time.
Check
Overvoltage FLT and Overvoltage DLY settings, check line
voltage on L1, L2, L3.
For protection parameters settings refer to section 4.7.2 page 26.
Phase Loss
Trips the ASTAT-BP if 1 or 2 phases are missing.
In cases where the current transformers are connected externally (ASTAT-BP
210-1100A models), verify that that the current transformers are not grounded.
Each current transformer is connected with its 2 wires only and these wires are
not grounded externally.
If previous action does not solve the problem and you are sure that no real
phase loss exists, you can set
Phase Loss protection to Disable.
This situation can occur in rare cases when there is no real fault but the ASTAT-
BP recognizes unusual behaviour like when Total Harmonic Distortion in Voltage
(THDV) in the network is high.
If this is a true case of
Phase Loss then after setting Phase Loss protection
to
Disable the motor will single phase and most likely be tripped by the over
load protection mechanism.
Phase loss might not be detected in motor operating under a light load.
For Phase Loss protection setting refer to section 4.7.7 page 37.
Freq. or ph
loss
Trips the ASTAT-BP if frequency is not in the range of 40-66.6Hz
Check that frequency variations are between 40-66.6Hz.
Phase Sequence
Trips the ASTAT-BP if line phase sequence is wrong.
Check line phase sequence and if wrong, swap two wires on line side. If motor
now rotates in the wrong direction, swap two wires on load side of the ASTAT-
BP.
For
Phase Sequence protection setting refer to section 4.7.7 page 37.