Ultimate Power UP1200PCUL User Manual page 18

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Charge
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Short
Symptom
Inverter will not turn on during initial
power up.
No AC output voltage and no
indicator lights ON.
AC output voltage is low and the
inverter turns loads OFF in a short
time.
Charger is inoperative and unit will
not accept AC.
Charger is supplying a lower charge
rate.
Charger turns OFF while charging
from a generator.
Sensitive loads turn off temporarily
when transferring between grids and
inverting.
Noise from Transformer/case*
*The reason for the noise from transformer and/or case
When in inverter mode and the transformer and/or case of the inverter sometimes may vibrate and make noise.
The noise may come from transformer:
According to the characteristics of our inverter, there is one type of load which will most likely to cause rattles of
transformer, that is a half-wave load, load that uses only a half cycle of the power (see figure 1). That is a half-wave
load, load that uses only a half cycle of the power (see figure 1). This trends to cause imbalance of magnetic field of
transformer, reducing its rated working frequency from 20 KHz to, say, maybe 15 KHz (it varies according to different
loads). This way, the freq of noise falls exactly into the range (200Hz - 20 KHz) that human ear can sense.
The most common load of such kind is hair dryer.
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Possible Cause
Batteries are not connected, loose
Battery side connections.
Low battery voltage.
Inverter has been manually
transitioned to OFF mode.
Low battery.
AC voltage has dropped
out-of-tolerance
Charger controls are improperly set.
Low AC input voltage.
Loose battery or AC input
connections.
High AC input voltages from the
generator.
Inverter's Low voltage trip voltage
may be too low to sustain certain
loads.
Applying specific loads such as hair
drier
Figure 1
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Recommended Solution
Check the batteries and cable
connections.
Check DC fuse and breaker.
Charge the battery.
Press the switch to Power saver on or
Power saver off position.
Check the condition of the batteries
and recharge if possible.
Check the AC voltage for proper
voltage and frequency.
Refer to the section on adjusting the
"Charger Rate".
Source qualified AC power.
Check all DC /AC connections.
Load the generator down with a
heavy load.
Turn the generator output voltage
down.
Install a UPS if possible.
Remove the loads
Beep
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continuous
Beep
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continuous