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

imrj

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....

dc42

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?

mrehorstdmd

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.

Karim

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

fcwilt

@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

Karim

;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

fcwilt

@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

Karim

Yea, I did the when I install it first.

fcwilt

@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

Karim

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