ControlSysNick
Lifetime Supporting Member
I'm using an Automation Direct GS20 VFD for the first time and I have a question for the Automation Direct gurus regarding the recommendation of a contactor on the incoming AC line power. According to the manual:
"The addition of a magnetic contactor (MC) in the AC line power input wiring is recommended to turn off power quickly and reduce the possibility of malfunction if the protection function of the GS20(X) AC drive is activated.".
I intend to use the STO function with the E-Stop and this application does not require cutting the power to the drive in an E-Stop situation.
From what the manual says, the purpose of this line-side contactor is to protect the drive if the "protection function of the GS20(X) AC drive is activated.".
According to the manual, the protective function is activated in an overload situation. Would it not be enough to monitor a relay on the the drive for an overload condition and just turn off the run signal if an overload occurred? Or do you always have contactor on the 3-phase AC line power ahead of the drive?
"The addition of a magnetic contactor (MC) in the AC line power input wiring is recommended to turn off power quickly and reduce the possibility of malfunction if the protection function of the GS20(X) AC drive is activated.".
I intend to use the STO function with the E-Stop and this application does not require cutting the power to the drive in an E-Stop situation.
From what the manual says, the purpose of this line-side contactor is to protect the drive if the "protection function of the GS20(X) AC drive is activated.".
According to the manual, the protective function is activated in an overload situation. Would it not be enough to monitor a relay on the the drive for an overload condition and just turn off the run signal if an overload occurred? Or do you always have contactor on the 3-phase AC line power ahead of the drive?