Gentherm 5220 Operating Manual page 56

28142 Rev 15
A Limiter-only Assembly is available for use with the model 5220 TEG, and it comes installed
by default on all 12V 5220 TEGs. This text describes how to adjust the Limiter parameters,
if applicable.
Output Voltage Adjustment
The Limiter is factory set at 14.1 V (Model 5220-12V). If the output voltage requires fine tuning
to better match your application, follow the below steps:
Disconnect the customer load from the TEG, terminals 4 (-) and 5 (+) of TB-1.
Move the jumper clip on the terminal block TB-1 to the RUN position, i.e. between
terminals 1 and 2.
Connect a voltmeter between terminals 4 (-) and 5 (+) of TB-1 and measure the
output voltage.
Adjust the output voltage by turning the output voltage adjustment potentiometer,
shown in Figure 6 – 220-Watt Limiter Assembly, until the measured voltage is at a
desirable level.
Voltage Sensing Relay (VSR) Adjustment
The VSR provides a set of contacts to indicate an alarm condition when the output voltage
drops below a pre-set minimum. It is factory set at 11.5 V (Model 5220-12V). The VSR is
rated for 2 A at 30 V DC and will take up to wire size no. 16 AWG.
Because the sensing point for the relay trip is ahead of a blocking diode, set
the no-load trip-point 0.5 V higher than the required trip-point. For example,
consider an alarm is required when the output voltage drops to 11.5 V at the
NOTE:
customer load terminals. When making the trip-point adjustment at no-load
conditions, set it to trip at 12.0 V as measured at the customer load terminals.
This way the VSR will trip when the customer load voltage approaches 11.5V.
Follow these steps to adjust the VSR set point:
Isolate the TEG from the load and batteries by opening the fuse or circuit breaker
through which it is connected.
Connect a voltmeter between terminals 4 (-) and 6 (+) of TB-1 and measure the
output voltage.
Set the output voltage to the desired VSR trip-point voltage value using the output
voltage potentiometer shown in Figure 6 – 220-Watt Limiter Assembly.
Place an ohmmeter between the common and normally open contact of the VSR.
Turn the VSR adjustment pot shown in Figure 6 – 220-Watt Limiter Assembly until
the contacts open (the normally open contacts are closed when output voltage is
above VSR trip-point).
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ADJUSTMENT
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