• Brake chopper • Mains disconnect • Contactor • Mains disconnect with contactor • Circuit breaker Illustration 1.3 shows an example of a frequency converter with an options cabinet. Table 1.2 lists the variants for the frequency converters that include input options. Options unit ...
200 mm (7.9 in) between control cables, motor and mains 2 Frequency converter 7 Motor, 3-phase and PE 3 Output contactor (Generally not recommended) 8 Mains, 3-phase and reinforced PE 4 Earth (grounding) rail (PE) 9 Control wiring 5 Cable insulation (stripped) 10 2 Equalising min. 16...
That process sends the control voltage to either a relay or a contactor or both. When the relay or contactor or both close the contacts inside the relay or contactor close. This completes another circuit which is typically line voltage but can be a control circuit. This line voltage energizes...
24 volts is also applied to thecompressor contactorand a relay inside the air handler. That causes the system to come on in the cooling mode and cool the zone until the thermostat satisfies. The reversing valve also engages when the solid-state control board calls for defrost mode only when ...