GE Industrial Solutions ASTAT XT - Manual (Page 61)

61 • Trouble Shooting
Wrong Connection
Trips the ASTAT-XT when one or more motor phases is not properly connected to
ASTAT-XT’s load terminals or if there is an internal disconnection in the motor
winding.
Verify that the motor is connected properly.
See note 1 at the end of this section.
Shorted SCR
Trips the ASTAT-XT and prevents starting if any SCR is short-circuited or when
motor windings are shorted.
Check with an ohmmeter between L1-U, L2-V, L3-W; resistance > 20 KΩ.
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.
See note 1 at the end of this section.
Over Temperature
Heat-sink over-temperature. Trips the ASTAT-XT when the heat-sink temperature
rises above 85°C.
Improve cooling or use a bypass contactor. Check that motor starting is not too
frequent.
External Fault
Trips the ASTAT-XT when a N.O. contact between terminals 19-21 closes for over
two seconds.
Check contact position and cause of closure.
Wrong Parameters
Parameters not transferred from RAM to EEPROM or vice versa.
After loading new software version or after power up, press Reset, then Mode and ▼
simultaneously and save the default parameters by pressing Set and Mode
simultaneously.
(If the Fault LED is ON, press Reset after Wrong Parameters).
Refer to section
4.4 page 21 for reviewing and modifying parameters.
OC or wrong CON.
Trips the soft ASTAT-XT when connected Inside Delta and Wrong connection or if
over current is detected by the ASTAT-XT.
Verify that the motor is not stalled or shorted and check cables and wiring.
Verify that motor and ASTAT-XT are connected exactly as shown in section
8.20
page 74. If the circuitry is 100% confirmed it is possible to start when dip switch #7
(expanded settings) is ON (refer to section
5.5.5 page 50). If a fault occurs again
consult the factory. The operator is advised to try operating one time only. Note that
it is useless to try starting in this mode more than once.
Note 1:
When operating in D.Set: Generator Parameters, Shorted Scr and Wrong Connection faults
are not active.
If required, these faults may be eliminated by implementing D.Set: Generator Parameters.
Refer to section
8.17 page 71 for setting the ASTAT-XT in D.Set: Generator Parameters wiring .