TECHNICAL USER´S MANUAL
15
Thyristor modules
5 – Troubleshooting
As explained in Section 3.5, thyristor modules inform the user of various faults and errors
through the four LED indicators on the front panel. The troubleshooting procedures for various
faults and alarms described as follows.
•
Power is connected but POWER LED does not light up:
Please check the power connections and the STATUS and/or FAULT LEDs. If none of the
LEDs is lit, then the internal circuitry is not powered. Make sure that power cables, superfast
fuses and switches are all properly wired and power is received by the module.
If any one of the STATUS or FAULT LEDs is lit, then the module is damaged and user should
contact the technical service department at the number provided in Section 7.
•
REACTOR FAULT DETECTION LED is lit:
Please check if the detuned filter reactor thermostat is connected to EXT+ and EXT-
terminals. If a detuned reactor does not exist in the electrical system, then these terminals
must be shorted. They must also be shorted if a detuned filter reactor is used without wiring
the thermostat connections. Otherwise, the module will evaluate this situation as a reactor-
thermal fault and will not let the user switch on the capacitors.
•
FAULT LED is blinking:
If the module detects a misconnection on the L1-C1 and L3-C3 terminals, a fault on the
discharge mechanism or any other error which must be cleared before the system is
activated, this LED blinks continuously and prevents the system from activating until the fault
is cleared.
1.
Make sure that L1 and L3 are connected to the line through the superfast fuses. If the
connections are correct, then check to see if the fuses are blown.
2.
If L1 and L3 are properly connected and the fuses are not blown, then check to see if
C1 and C3 are properly connected to the capacitors.
3.
If C1 and C3 are properly connected to the capacitors, then check to see if the
discharge reactors or resistors are damaged, shorted or open-circuited.
4.
If the discharge mechanism is damaged, please replace the discharge mechanism and
power up the modules.
5.
If a discharge reactor or a discharge resistor is not utilized, the capacitors will stay
charged and the modules will not be able to switch capacitors.
Capacitors must be
equipped with a proper discharging mechanism!
