Gentherm 5220 Operating Manual page 55

28142 Rev 15
Output Voltage Adjustment
The L/C is factory set at 27.0 V (Model 5220-24V). If the output voltage requires fine tuning
to better match your application, follow the below steps:
Isolate the TEG from the load and batteries by opening the fuse or circuit breaker
through which it is connected.
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 6 (-) and 7 (+) of TB-1 and measure the
output voltage.
Adjust the output voltage by turning the output voltage adjustment potentiometer,
shown in Figure 7, until the desired voltage is reached.
Re-connect the TEG to the load and batteries by closing the fuse or circuit breaker
through which it is connected.
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 23.0 V (Model 5220-24V). 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 23.0 V at the
NOTE:
customer load terminals. When making the trip-point adjustment at no-load
conditions, set it to trip at 23.5 V as measured at the customer load terminals.
This way the VSR will trip when the customer load voltage approaches 23.0V.
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 6 (-) and 7 (+) 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 7.
Place an ohmmeter between the common and normally open contact of the VSR.
Turn the VSR adjustment pot shown in Figure 7 until the contacts open (the
normally open contacts are closed when output voltage is above VSR trip-point).
Using the output voltage potentiometer, raise output voltage to a value where the
VSR will reset.
To re-check the trip-point, lower the output voltage and monitor opening of the VSR
contacts. Fine tune as required to achieve desire trip value.
Reset output voltage to the desired normal operating value. Consult the Data Plate
label for the factory default voltage setpoint or adjust to your desired value.
Gentherm Global Power Technologies
ADJUSTMENT
Page 49