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MICROMASTER 420 (MM420): using pushbuttons

Created by: ACF82 at: 6/20/2021 10:38 AM (4 Replies)

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6/20/2021 10:38 AM

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ACF82

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Hi,

I like to setup a MM420 with three pushbuttons (on fwd on DI1, off on DI2, on rev on DI3) and I followed the directions from FAQ entry ID 57908330 that covers the settings for fwd and off:

function	parameter	description	setting	description
Selection of command source	p0700	command source	2	terminal
ON via push-button, NO	p0701	function of digital input 1	99	enable BICO parameterization
OFF via push-button, NC	p0702	function of digital input 2	4	OFF3 - quick ramp-down (p1135 = ramp-down time)
ON-signal via PI-max-comparator	p0840	ON/OFF1 command source using BICO	53.11	r0053.11 Act. status word 2, Bit11 PID output r2294 == P2291 (PID_max)
PI-fixed-frequency via ON-signal	p2221	command source of fixed PID setpoint selection	722.0	digital input 1
fixed-frequency value on PID setpoint	p2253	setpoint source for PID setpoint input	2224	r2224 Act. fixed PID setpoint
actual speed value on PID setpoint	p2254	trim source for PID setpoint	21	r0021 actual inverter output frequency
PID-feedback signal OFF	p2264	source of the PID feedback signal	0
p2280	proportional gain for PID controller	50

The above settings work just fine. In order to realise the reverse function, I added these settings:

function	parameter	description	setting	description

ON via push-button, NO	p0703	function of digital input 3	99	enable BICO parameterization

ON-signal via PI-max-comparator	p0842	ON reverse/OFF2 command source using BICO	53.11	r0053.11 Act. status word 2, Bit11 PID output r2294 == P2291 (PID_max)
PI-fixed-frequency via ON-signal	p2222	command source of fixed PID setpoint selection	722.2	digital input 3

When pushing the reverse button on DI3, the motor spins forward and not reverse as intended. So essentially both buttons do the same thing. I can't wrap my head around what is wrong here. Can anybody enlighten me on how to make the reverse setting work?

Best regards,

Andy

6/27/2021 12:06 PM	Rate (0)
Tractor Gold Member Joined: 3/27/2008 Last visit: 11/3/2024 Posts: 1144 Rating: (142)	I suspect, that because the PID is being used for speed setting, reverse is not possible. This PID function can only operate in a positive direction. Tractor
	Tractor
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7/7/2021 7:12 AM	Rate (0)
ACF82 Posts: 2 Rating: (0)	Thanks for the reply. Indeed, I have not gotten it to work that way and in the end I cobbled together a latching circuit with a bunch of relays. Still I'm a bit surprised that this inverter does not support pushbuttons, that seems pretty basic to me and is readily supported by other inverter brands that I worked with.
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7/7/2021 10:30 AM	Rate (0)
Tractor Gold Member Joined: 3/27/2008 Last visit: 11/3/2024 Posts: 1144 Rating: (142)	Thanks for the reply. You are not missing anything with this MM420, and what you have done is the right approach to take. The MM420 has been in production for some years now, now taken out of production in fact. Yes new sinamics inverter drive do have this facility, simple and effective for controlling motors. Tractor
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7/10/2021 10:13 AM	Rate (0)
Ayman Elotaify Platinum Expert Joined: 5/28/2008 Last visit: 11/4/2024 Posts: 4516 Rating: (839)	ACF82 Thanks for the reply. Indeed, I have not gotten it to work that way and in the end I cobbled together a latching circuit with a bunch of relays. Still I'm a bit surprised that this inverter does not support pushbuttons, that seems pretty basic to me and is readily supported by other inverter brands that I worked with. Hello, Please make the following settings: P0700 = 2 (terminal) P0701 = 1 (Function of digital input 1 => On Right) P0702 = 3 or 4 (Function of digital input 2 => Off2 or Off3) P0703 = 2 (Function of digital input 3 => On Left) And tell us from where you will send the setpoint speed to tell you how to parameterize P1000 to P1007 Hope this helps.
	Ayman Elotaify
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Created by: ACF82 at: 6/20/2021 10:38 AM (4 Replies)

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