ACU-MP3 Manual EGCON CO., LTD
9.4. UVR contacts(ST1, ST2) of commercial power gets CLOSE.
9.5. Generator power lamp turns on when generator power is applied.
9.6. If generator power is normal, ATS is transferred to generator power's side after set time
delay and insertion lamp of generator power turns on.
9.7. If commercial power is applied, lamp of commercial power turns on and after set time
delay, ATS is transferred and insertion lamp of commercial power turns on.
9.8. UVR contacts(ST1, ST2) of commercial power is OPEN.
10. TEST Operation Test
10.1. TEST mode is available during both AUTO and MANU mode.
10.2. While commercial power is normal and ATS is transferred to commercial power, if MODE
switch is pressed over 10 sec, TEST LAMP turns on.
10.3. If TEST mode is set, UVR contacts(ST1, ST2) of commercial power are CLOSE.
10.4. If generator power is not applied within 10 sec, mode is changed to precious mode after
buzzer alarms.
10.5. Lamp of generator power turns on when generator power is applied, and ATS is
transferred to generator power's side after time delay.
10.6. When ATS is normally transferred to generator power, ATS will be transferred to
commercial power after time delay for transferring to commercial power.
10.7. Insertion lamp of commercial power turns on.
10.8. TEST mode terminates and mode changes to precious mode.
11. Problem Causes and Solutions
Symptom Cause Solution
Indication lamps turn on
when ATS is transferred to
the reverse and ATS is
not transferred when
transfer button is pressed.
Assistant contact of ATS is
reversely connected.
Correct wiring according to circuit
diagram.
Lamp of commercial
power flickers.
One of the three phases of
commercial power is absent
or there is a phase that is
not connected.
Check whether the voltage of each phase
is normal and there is absent wiring.
Buzzer keeps alarming
and transfer indication
lamp flickers.
Contact of ATS is not
completely transferred even
after controller's trial to
transfer
Transfer ATS mechanically using lever
after blocking power supply to the
controller and then connect power to the
controller.
Assistant contact of ATS is
not connected correctly
Correct wiring according to circuit
diagram.
