tomcat59alan
Well-Known Member
Think we had gone on to fixing driver packs Alan
I was answering post 4, I'm living in the past
I was answering post 4, I'm living in the past
Datatek
Well-Known Member
At my age, the past is about all there isI was answering post 4, I'm living in the past
tomcat59alan
Well-Known Member
At my age, the past is about all there is
:hysterically_laughi Bet you have years of upsetting people left in you yet, it's one of the pleasures of growing old.
Datatek
Well-Known Member
Me upset people? Never:hysterically_laughi Bet you have years of upsetting people left in you yet, it's one of the pleasures of growing old.
tomcat59alan
Well-Known Member
tony.......:d
tomcat59alan
Well-Known Member
I did type that in capitals but it never came out as such
Nobody upsets me Alan. Capitals on a single word don't seem to work for some reason.
tomcat59alan
Well-Known Member
Nobody upsets me Alan. Capitals on a single word don't seem to work for some reason.
Mmm, don't get mad get even always works for me
Happy New year Tony to you and your family and all other forum members and guests.
youngshag
Member
Right then, after re-setting the eas for a third time in two days I have ordered a second hand unit off e-bay, from one of the breakers. Only £19.99 plus postage. Very reasonable. Managed to fit it today between rain showers and was a doddle. Took a while to re-pressurize but went up a treat and didn't need to re-set the eas afterwards. All is good at the mo. Will re-post if it changes in any way. Thanks all, for your posts and pointers.
Datatek
Well-Known Member
I take it you mean the driver pack?
Datatek
Well-Known Member
Interested to look if you want to post it to me.
youngshag
Member
Right, here we are over a month and a half after I fitted the replacement driver pack and I'm happy to report all is well with the EAS!! No rising to wading height or all 4 lights on the dash, no alarms at all. I'd say that it was a good fix. Again thanks for all input from members.
Castor
Trainee maniac
Could well be driver pack or simply the act of plugging the new one in and making better contacts.
Muchacho interested in all this. I too get random calls to wade, which could well be the driver pack and/or its connectors - but today I saw detail that showed the ludicrous kludge that the driver pack applies to the solenoids to keep the current down.
Whoever signed that off wants hanging...
With that degree of designed-in complexity, what chance do we have?
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Castor
Trainee maniac
On page 6 - the so-called "hit & drop" waveform. Entirely avoidable, unnecessarily complicated and inherently unreliable.
The valvery design is just wrong in so many ways I don't know where to start. it wouldn't be so bad if it were not for the fact that cheapo off the peg SOV's would have done just fine...
Grumble moan whinge.
"The six solenoid valves are relatively large because of the response time required by the system."
Duh?? Bob Moog does fast valves - the requirement here is glacial.
If these solenoid valves were operated for long periods of time under conditions of
high temperature or high currents, they would overheat and fail."
Well spec then correctly then.
To prevent this, the valve driver controls the amount of current that flows through each solenoid coil. Because the
current required to open the solenoid is considerably higher than the current required to hold
the solenoid open, a “hit and drop” signal is used."
Well if you must, you must, but don't blame me when it goes wrong, which it will.
"Upon a valve open request the control voltage is near 0V for 0.050 seconds (50 milliseconds) then is pulsed to limit current through
the coil. The pulsed voltage will read approximately 9 volts with a high impedance DVOM or can be viewed with an oscilloscope to be a 24 KHz 12-volt square waveform."
Talk about making it hard for yourself....
"The steady state current passing through each coil is approximately 1 amp."
How big are the armatures they are moving???
The valvery design is just wrong in so many ways I don't know where to start. it wouldn't be so bad if it were not for the fact that cheapo off the peg SOV's would have done just fine...
Grumble moan whinge.
"The six solenoid valves are relatively large because of the response time required by the system."
Duh?? Bob Moog does fast valves - the requirement here is glacial.
If these solenoid valves were operated for long periods of time under conditions of
high temperature or high currents, they would overheat and fail."
Well spec then correctly then.
To prevent this, the valve driver controls the amount of current that flows through each solenoid coil. Because the
current required to open the solenoid is considerably higher than the current required to hold
the solenoid open, a “hit and drop” signal is used."
Well if you must, you must, but don't blame me when it goes wrong, which it will.
"Upon a valve open request the control voltage is near 0V for 0.050 seconds (50 milliseconds) then is pulsed to limit current through
the coil. The pulsed voltage will read approximately 9 volts with a high impedance DVOM or can be viewed with an oscilloscope to be a 24 KHz 12-volt square waveform."
Talk about making it hard for yourself....
"The steady state current passing through each coil is approximately 1 amp."
How big are the armatures they are moving???
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