Re: D1D40 SSR's burning out?? [TANKS]

[Grant Mahalek <gmahalek-at-shaw.ca>]

Flier,

Thanks for the suggestion.  I will be measuring the max current draw today. 
Oh by the way, what's your name....I'd like to address you by your name.

Grant "I'am learning every day" Mahalek


----- Original Message ----- 
From: "flier" <FLIER-at-sbcglobal.net>
To: <tanks-at-rctankcombat.com>; <tanks-at-rctankcombat.com>
Sent: Wednesday, November 02, 2005 7:15 AM
Subject: Re: D1D40 SSR's burning out?? [TANKS]


> Grant,
>
> Have you measured your max current draw?
>
>
> --- Original Message ---
> From: Grant Mahalek <gmahalek-at-shaw.ca>
> To: tanks-at-rctankcombat.com
> Subject: Re: D1D40 SSR's burning out?? [TANKS]
>
>>Hi Norm,
>>
>>In Test #1 the right SSR got very hot.
>>
>>I forgot to check the SSR temperatures in Test#2.
>>
>>Grant
>>  ----- Original Message -----=20
>>  From: Norman Wieser=20
>>  To: tanks-at-rctankcombat.com=20
>>  Sent: Tuesday, November 01, 2005 9:08 PM
>>  Subject: Re: D1D40 SSR's burning out?? [TANKS]
>>
>>
>>  Hi Grant
>>
>>   Did the SSR's get very Hot ?
>>
>>  Norm
>>    ----- Original Message -----=20
>>    From: Grant Mahalek=20
>>    To: tanks-at-rctankcombat.com=20
>>    Sent: Tuesday, November 01, 2005 6:27 PM
>>    Subject: Fw: D1D40 SSR's burning out?? [TANKS]
>>
>>
>>    Hi there,
>>
>>    I've run into a bit of a problem in the
> construction of my Hetzer.  =
>>I've burned out three Crydom SSR's with my Anvilus
> proportional motor =
>>controller.  I've sent off an email to
> www.crydom.com today in hopes of =
>>getting some suggestions.  The Crydom website
> mentions something called =
>>"Transient Protection" and protection of the SSR's
> using fast recovery =
>>type diodes with PIV rated greater than supply =
>>voltage(....cool....unfortunately I don't completely
> understand this). =
>>Has anyone out there
>>
>>    In the "Tri-Pact News Service" article
> entitled "R/C Combat Vehicles =
>>Speed Controls" under the section "Other Issues"
> various devices are =
>>recommended to limit power surges and radio
> interference.  After a small =
>>fix(installation of a CMOS NAND 4011 Gate) into the
> steering and =
>>throttle servo leads, radio interference is no
> longer a problem.
>>
>>    However, burning out these SSR's is becoming a
> bit of a =
>>pain....xxo!!/?##.
>>
>>    Can anyone out there offer suggestions, detailed
> or otherwise on how =
>>to overcome this obstacle?  Any suggestions would be
> much appreciated.
>>
>>    Oh, by the way, the rubber boat roller drive
> wheels did not work, =
>>the rubber was too hard and the drive wheels slipped
> in the tracks.  =
>>I'am going to use the "tried and true" TTS rubber
> bungee cord wrapped =
>>plywood drive wheels.  And for those of you
> wondering about what =
>>thickness of drive-shaft to use, I support Steve
> Tyng's suggestion to =
>>use a hardened steel shaft > 1/2 inch.  I've already
> bent both my 1/2 =
>>inch drive shafts in the minimal testing I've done
> so far.
>>
>>    Supper call....thanks for any help you guys can
> offer.
>>
>>
>>    Grant P. Mahalek
>>
>>    ----- Original Message -----=20
>>    From: Grant Mahalek=20
>>    To: support-at-crydom.com=20
>>    Sent: Tuesday, November 01, 2005 7:33 AM
>>    Subject: D1D40 SSR's burning out??
>>
>>
>>    Hello there,
>>
>>
>>    I'am a hobbyist using a pair of Crydom D1D40
> SSR's with a motor =
>>controller to provide proportional speed control for
> a custom built 1:6 =
>>scale radio control combat tank. The motor controller
> (Anvilus RC Relay =
>>SSR Motor Controller; Board h_050412, Manual 050425)
> is described in =
>>detail at www.anvilus.com . The motor and control
> system is wired =
>>according to figure 3, page 5 of the manual.  I'am
> using a pair of new =
>>electric scooter motors(MY1016) from
> www.unitemotor.com operated at =
>>24Vdc. Motor specifications: 24Vdc, 2750 rpm,
> 15.4amps, 280watts. There =
>>is a 40 amp automotive fuse installed in-line on the
> each motor power =
>>lead.  No other circuit protection is provided.
>>
>>    I have burned out three(3) Crydom D1D40 SSR's
> thus far.  This is =
>>getting a little expensive for a hobby......
>>
>>    Can you help?
>>
>>    Circumstances of failures:
>>
>>    1.)Test #1; left SSR failed; left SSR -1
> terminal wires became loose =
>>during tank test run. Up to this time(20 minutes of
> run time), the =
>>electronics and drive system were operating with
> full mixing and =
>>proportional speed control.  Right drive motor and
> right SSR became very =
>>hot.
>>
>>    2.)Test #2; right SSR failed after about 20
> minutes of fully =
>>proportional run-time. No apparent loose electrical
> connections. No =
>>apparent mechanical binding in drive-train. Right
> drive motor became =
>>very hot.
>>
>>    Apparently, there are twenty to thirty RC combat
> tanks using the =
>>same electronics(with Crydom SSR's) and drive
> systems with almost =
>>identical components with no problems.
>>
>>    Do you have any suggestions regarding the
> inclusion of circuits or =
>>components to protect the SSR's from being burned
> out.  Could you please =
>>be very specific with any suggestions regarding
> protective circuits or =
>>components(ie.-component/circuit installation into
> motor control wiring =
>>and type and specific sizes of and sizes of any
> components).=20
>>
>>
>>    Thank you,
>>
>>
>>    Grant P. Mahalek
>>    gmahalek-at-shaw.ca
>>    403-948-6443(res)
>>    403-880-2070(bus, cell)
>>
>>
>>
>>
>>
>>
>
>
>