I've searched the forums for a design and not found a definitive answer, so here goes.
I have 3 extraction fans in my house that have shaded pole single phase 230VAC motors of around 60W (One is larger at 100W)
I will be using a Finder slave dimmer (Finder part 15.11.8.230.0400) that accepts a 0-10v control signal to set the output via phase chopping.
It can do leading edge and trailing edge dimming so I'm assuming there is a mosfet based circuit inside.
My home automation system will be providing the 0-10v signal.
My understanding is that I need to set the output to be leading edge for an inductive load. (Although it does have two settings for leadind edge, see below)
I really only need about 3 speeds so I'm thinking of designing the control circuit to give the fan a period (say 3 seconds) at full power to ensure it starts, and then throttle back to the selected level. A bit of trial and error to observer performance and check the motor is not over heating etc.
Does this look like a plan or have I overlooked something ?
* The two leading edge modes are:
B2 - Dimmable compact fluorescent lamps (CFL), dimmable LED lamps (Leading edge)
B3 - 12/24 V halogen lamps with toroidal electromagnetic transformer, 12/24 V halogen lamps with “E” core electromagnetic transformer (Leading edge)
I assume I use mode B3.
I have 3 extraction fans in my house that have shaded pole single phase 230VAC motors of around 60W (One is larger at 100W)
I will be using a Finder slave dimmer (Finder part 15.11.8.230.0400) that accepts a 0-10v control signal to set the output via phase chopping.
It can do leading edge and trailing edge dimming so I'm assuming there is a mosfet based circuit inside.
My home automation system will be providing the 0-10v signal.
My understanding is that I need to set the output to be leading edge for an inductive load. (Although it does have two settings for leadind edge, see below)
I really only need about 3 speeds so I'm thinking of designing the control circuit to give the fan a period (say 3 seconds) at full power to ensure it starts, and then throttle back to the selected level. A bit of trial and error to observer performance and check the motor is not over heating etc.
Does this look like a plan or have I overlooked something ?
* The two leading edge modes are:
B2 - Dimmable compact fluorescent lamps (CFL), dimmable LED lamps (Leading edge)
B3 - 12/24 V halogen lamps with toroidal electromagnetic transformer, 12/24 V halogen lamps with “E” core electromagnetic transformer (Leading edge)
I assume I use mode B3.