----- Original Message -----
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 -----
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).
Thank you,
Grant P. Mahalek
403-948-6443(res)
403-880-2070(bus, cell)