Operating limits, Troubleshooting guide – Cobra Electronics CPI M1500 User Manual

Page 13

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21

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20 English

Operating Limits

Power Output

The inverter can deliver 1500 watts for about 60 minutes. The inverter must cool
for 15 minutes before it can resume operation at 1500 watts. Note: The wattage
rating applies to resistive loads.

The inverter will operate most AC loads within its power rating. Some induction
motors used in freezers, pumps, and other motor-operated equipment require very
high surge currents to start. The inverter may not be able to start some of these
motors even though their rated current draw is within the inverter’s limits. The
inverter will normally start single phase induction motors rated at

1

2

HP or less.

Input Voltage

The inverter will operate from input voltage ranging from 10 volts to 15 volts.
Optimum performance will occur when the voltage is between 12 volts and
14 volts. If the voltage drops below 10.5V+/-0.3V, an audible low battery
warning will sound. The inverter will shut down if the input voltage drops
below 9.5V+/-0.3V. This protects the battery from being over-discharged.
It will restart when the input voltage exceeds 12V+/-0.3V.

The inverter will also shut down if the input voltage exceeds 15.75V+/-0.75V.
This protects the inverter against excessive input voltage. Although the inverter
has protection against over-voltage, it may still be damaged if the input voltage
was to exceed 16 volts.

Operating Limits

Operation

Troubleshooting Guide

Operation

Troubleshooting Guide

Problem/Symptom

Low output voltage

No output voltage

No output voltage after
prolonged use

No output voltage,
“Protect” indicator
lighted

No output voltage

No output voltage

Low battery alarm
on all the time

Possible Causes

Overload

Low input voltage

Thermal shutdown

High input voltage

Short circuit

Inverter switched Off

No power to inverter

Reverse DC polarity

Poor DC wiring

Poor battery condition

Solution

Reduce the load.

Recharge battery. Check
connections and cable.

Allow inverter to cool Off.

Reduce load, continuous operation
input current required.

Improve ventilation; Make sure ventilation
openings in the inverter are not obstructed.

Reduce ambient temperature.

Make sure the inverter is connected
to 12V battery.

Check regulation of charging system.

Check load for proper operation.

Turn inverter On.

Check wiring to inverter.

Observe correct polarity.

Check connections.

Make sure battery is fully charged.

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