When the controller is set for limited range then the full range of the setpoint or potentiometer signal will be the upper 1/3 of the range.
1) If the FRC-20 is configured for 0-150V then the setpoint signal range will be approximately 100-150V.
2) If the FRC-20 is configured for 0-300V then the setpoint signal range will be approximately 200-300V
3) If the FRC-20 is configured for 0-600V then the setpoint signal range will be approximately 400-600V.
Depending on the input voltage and the variable transformer used the full range of the FRC-20 may not be used. For example a standard variable transformer has a 0-140VAC range. The setpoint range will be 100-140V if settings for (1) above are used.
FRC-20 Installation Manual
