Definitions
- 10 - IQ SERIES OWNERS MANUAL
1.5 Definitions
1.5.1 Quasi Sine Wave:
Quasi Sine Wave Inverters are sometimes called "modified sine wave inverters" or "modified square wave
inverters." Quasi sine wave inverters produce an AC output wave different from the power produced by
the electric utility companies and rotating generators. Although this waveform has a higher peak voltage
than do square wave inverters, its peak voltage is not as high as a pure sine wave. Therefore, AC loads
containing power supplies might not always operate properly on the quasi sine wave inverters.
1.5.2 Load Demand Feature and Load Demand Mode:
The Load Demand Feature is an energy conserving feature which allows the inverter to enter the ‘Load
Demand Mode’ whenever the inverter is ON and the AC load has been less than 5 watts for
approximately 5 seconds. While in the ‘Load Demand Mode’ the inverter does not produce 120 volts AC
but instead produces pulses of reduced AC voltage, which the inverter uses to look for a load. When an
AC load greater than 5 watts is sensed, the inverter will turn fully ON to produce 120 Volts AC. The ‘Load
Demand Mode’ is often also described as ‘stand-by mode’ or ‘sleep mode’. While in the ‘Load Demand
Mode’ the inverter consumes approximately 140 milliamps of 12 volt DC power.
The Load Demand Feature can be turned OFF by setting Selector Switch 2 to the OFF position. This will
cause the inverter to remain fully ON, producing 120 Volts AC, whenever the inverter switch is ON and
regardless of AC load. It is desirable to do this when the device being powered draws less than 5 watts.
An example of such a device is a plastic pipe fusion machine, which draws less than 5 watts during the
‘coupling cooling time’. With the Load Demand Feature turned OFF and operating no AC load the
inverter consumes approximately 1.8 amps of 12 volt DC power.
1.5.3 Automatic Transfer Switch:
The Transfer Switch is a standard feature provided on all IQC models. The Transfer Switch automatically
allows input power, from an external AC power source such as shore power or a generator, to pass
through the inverter output circuit and be used to operate inverter loads.
1.5.4 Automatic Power Management:
The IQC’s AC Input 1 is the source of AC power for battery charging and also may provide passthrough
power for AC loads. The Automatic Power Management (APM) circuit monitors total AC amps on the
IQC’s AC Input 1 and reduces the battery charger’s AC power consumption when necessary so that total
AC1 amps do not exceed the APM Setting. The APM circuitry does not limit AC power passing through to
AC loads. The default APM Setting is 30 amps. By using the optional D07934 Remote APM Panel the
APM Setting can be adjusted to lower values. (More details can be found in the Automatic Power
Management description of operation.)
1.5.5 Ambulance Mode:
The primary purpose of Ambulance Mode is to prevent the inverter from coming ON and running down
the ambulance’s battery when the shore power cord accidentally becomes unplugged.
In Ambulance Mode the IQC performs similar to Vanner’s 20-1050CUL Ambulance inverter/charger. The
charger will turn ON and shore power will pass through as soon as shore power is connected to AC1.
(The ON/OFF Switch must be in the RUN position but the charger does not need to be manually turned
ON.) When shore power is disconnected, the inverter will not turn ON until the ON/OFF Switch, or remote
switch, is manually pushed to the Start position.
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