750w AC bed with SSR25 relay.....slow heating



  • I have done the heater tunning, but still takes a while to heat up the bed , when I used marlin board it was like 4 times as fast, do I need to do anything special for accounting that is an AC 120V bed with SSR25 relay? the duet bed heater output just feeds the relay....


  • administrators

    There is no reason why it should be significantly slower unless you have restricted the heater PWM. Please post your config.g and config-override.g files.

    Are you sure that the bed thermistor is reading the correct temperature?



  • This calculator should give you a pretty accurate idea of how long it should take to heat the bed:
    https://jscalc.io/calc/uS8JYjYISgIvzJ1x

    If the bed is massive, it will take a few minutes to heat up.



  • I have a 16"x16"x/14" Mic 6 Aluminum plate, with keenovo 1000w 400x400mm 110v. Mine take about 4mins to get 110C.

    This is my Bed config
    ;Bed
    M143 H0 S120 ; Disable bang-bang mode for the bed heater and set PWM limit
    M305 P0 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 0
    M307 H0 A204.4 C836.7 D1.5 S1.00 V24.3 B0 ; Set temperature limit for heater 0 to 120C



  • @karim said in 750w AC bed with SSR25 relay.....slow heating:

    I have a 16"x16"x/14" Mic 6 Aluminum plate, with keenovo 1000w 400x400mm 110v. Mine take about 4mins to get 110C.

    This is my Bed config
    ;Bed
    M143 H0 S120 ; Disable bang-bang mode for the bed heater and set PWM limit
    M305 P0 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 0
    M307 H0 A204.4 C836.7 D1.5 S1.00 V24.3 B0 ; Set temperature limit for heater 0 to 120C

    It seems to me your comments are out of place.

    Frederick



  • ;Bed
    M143 H0 S120 ; Set temperature limit for heater 0 to 120C
    M305 P0 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 0
    M307 H0 A204.4 C836.7 D1.5 S1.00 V24.3 B0



  • @karim said in 750w AC bed with SSR25 relay.....slow heating:

    ;Bed
    M143 H0 S120 ; Set temperature limit for heater 0 to 120C
    M305 P0 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 0
    M307 H0 A204.4 C836.7 D1.5 S1.00 V24.3 B0

    OK that makes more sense.

    Did you tune your bed heater?

    Frederick



  • Yea, I did the when I install it first.



  • @karim said in 750w AC bed with SSR25 relay.....slow heating:

    Yea, I did the when I install it first.

    OK good.

    Has anything changed since you did that? Added a build surface? A piece of glass?

    Frederick



  • I just have buildtak flex system. It was tune with this.


 

Looks like your connection to Duet3D was lost, please wait while we try to reconnect.