Gentherm 5220 Operating Manual page 8

28142 Rev 15 ABOUT THIS MANUAL
Set-up Voltage (V ): Voltage measured across the power unit at a specific ambient
SET
temperature while the power unit is connected to the precision resistor via SETUP mode.
VSET is proportional to set-up power. Fuel flow to the burner is adjusted to maintain the
correct voltage, and therefore maintain correct power output.
Open Circuit Voltage: Voltage at the terminals of the power unit when no current is flowing,
(i.e. open circuit), which is related to the temperature applied to the thermoelectric materials
inside the power unit.
When a power unit lead is suddenly disconnected, breaking the circuit with the load, the
voltage measured across the power unit changes to a higher value. This is known as the
momentary open circuit voltage (V ). The voltage will continue to climb from that level. Do
oc
not allow V to exceed 27.0 volts on the 5220 - otherwise, the TEG may be damaged.
oc
Measured V : V
measured across the precision resistor using a voltmeter while the
set set
electronics are in SETUP mode.
Required V : V needed to achieve rated power for the present ambient temperature.
set set
CP (Cathodic Protection): Thermoelectric generators can be used in impressed current
systems for cathodic corrosion protection of metallic structures, such as pipelines.
CP Interface System: An assembly of electrical components that acts as an interface
between the TEG and the CP load, which also provides adjustment and monitoring of power
to the CP load.
Limiter/Converter (L/C): The electronic system attached between the generator and the
load. The L/C converts one level of DC voltage to another and limits the power unit voltage
when the customer is not drawing peak load.
Manual Shutoff Valve: A manually operated valve in the gas line for turning on or shutting
off the gas supply to the TEG.
Solenoid Valve (SOV or SV): An electrically actuated valve that controls the gas supply to
the burner. This valve is operated by the Ignition Control System.
Surge Protection Device (SPD): A protective electronic device attached to the output
terminals that improves resistance to electrical surges. Comes paired with a dielectric
isolation adaptor for the fuel line. The SPD is included with all CP systems.
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