08
TNDZ
、
TNSZ series pillar type AC automatic voltage regulators
Symptons
Cause analysis
Troubleshooting method
The voltage regulator can regulate the
voltage normally but has no output.
Output contactor KM1 fault
Protection circuit board fault
Control transformer fault or open
circuit in wiring
Relay failure
Temperature protector (θ4 or θ5 or θ6)
fault
Replace the AC contactor
Change to the spare board for
TNSZ-100 or below;
Replace the protection circuit board
for TNSZ-150 or above
Check or replace the control
transformer
Replace the relay K1 or K2
Replace the temperature protector
(TNSZ-150 or above)
The small capacity of the user's power
supply leads to large input voltage
drop
The self-reset switch is in the “Mains”
position
Reduce the load or increase the power
supply capacity
Set the self-reset switch to the “Stop”
position, press the “Stop” button and
then start voltage stabilization
Voltage regulation becomes abnormal
after a period of use.
Motor fault
Failure or falling off of the coupling
(cross joint) of the motor and reducer
Gearbox gear is broken
Excessive resistance of voltage
regulation mechanism
Failure of the relay or contactor
controlling buck-boost
Control circuit board failure
Poor contact of control transformer
wiring
Internal motor protection circuit
breaker QF2 trips
Replace the motor
Replace the coupling (cross joint)
Replace the reducer
Adjust the voltage regulation
mechanism (remove dirt and dust, add
lubricating oil)
Replace the relay or contactor
Change to the spare board for
TNSZ-100 or below;
Replace the protection circuit board
for TNSZ-150 or above
Check the wiring of the control
transformer
Close the circuit breaker (TNSZ-150 or
above)
The voltage regulator is too noisy
after a period of use.
Sundries on the contactor core surface
Contactor core is damaged
A friction sound during voltage
regulation
Clean the core surface
Replace the contactor
This is normal
Correct the grid voltage to match the
input voltage range of the voltage
regulator
Turn the manual/automatic transfer
switch to the automatic state (voltage
stabilization light on)
The input voltage exceeds the rated
service range of the voltage regulator
The product does not switch to
automatic voltage stabilization state
The output voltage is too high or too
low when the voltage regulator is just
installed.
Without load, the fan starts for a long
time.
Thermostat (θ1 or θ2 or θ3) fault
Replace the thermostat
Turn the transfer switch to the
“Manual” position
Detecting circuit board failure
Open circuit of contactor coil or poor
contact of normally closed contact
point
Travel switch fault or open circuit of
motor control line
Open circuit of Fu1 fuse
Control transformer fault or open
circuit in wiring
Turn the transfer switch to the
“Automatic” position
Replace the detecting circuit board
Replace the contactor or replace the
contactor auxiliary contact
Replace or adjust the travel switch and
check the motor wiring
Check or replace the fuse FU1
Check or replace the control
transformer
The voltage regulator can’t regulate
the voltage automatically after start.
The voltage regulator can only start
the mains but can't start the voltage
stabilization.
When the voltage regulator starts with
the motor, the contactor keeps repeating
the action of closing and releasing.
