Jegs
Well-Known Member
The blurb suggests checking the speed of the blower motor. Could anyone advise how this might be done?
Hopeful thanks,
John G
Hopeful thanks,
John G
Eber.... fan
- Thread starter Jegs
- Start date
Robin2
Well-Known Member
Need a bit more info ... what blurb, what problem have you?
As far as I know the electronics keeps watch on the blower speed all the time the unit is running, and shuts it down if it fall too low.
As far as I know the electronics keeps watch on the blower speed all the time the unit is running, and shuts it down if it fall too low.
Jegs
Well-Known Member
Robin,
Thank you for your reply. The problem is that it doesn't work, & the service sheet says check fan speed.
I am simply trying to eliminate potential faults. Connecting the terminals on control switch does not produce fault indicating messages.
John G
Thank you for your reply. The problem is that it doesn't work, & the service sheet says check fan speed.
I am simply trying to eliminate potential faults. Connecting the terminals on control switch does not produce fault indicating messages.
John G
Robin2
Well-Known Member
John, I like puzzles, but you are being very economical with the facts. Did it ever work? What sort of Eberspacher is it? What noises does it make when you switch it on? (clicks etc). At start-up the first thing that is checked is the motor. If it does not work the startup process goes no further.
Are the fuses OK?
Some of them have an electronic lock-out which prevents starting after 10(?) failures to start.
I dumped my D5L after the second fan motor wore out. Before the motor failed (due to worn commutator brushes) it could be persuaded to operate for a few extra hours by tapping it with a small hammer - I presume this loosened the worn brushes so they made contact again.
On mine you could easily get at the power wires to the motor and connect them directly to the 12v supply to check whether the motor worked.
There was also a circuit board with heavy duty resistors on it that controlled the motor speed (along with a relay) and if the resistors were damaged the motor would not get any power. I damaged mine by not replacing the cable cover properly so there was not a sufficient cooling air flow over the resistors - came 'home' to a dreadful smell of fried electric parts.
...Now its your turn to be expansive ...
Are the fuses OK?
Some of them have an electronic lock-out which prevents starting after 10(?) failures to start.
I dumped my D5L after the second fan motor wore out. Before the motor failed (due to worn commutator brushes) it could be persuaded to operate for a few extra hours by tapping it with a small hammer - I presume this loosened the worn brushes so they made contact again.
On mine you could easily get at the power wires to the motor and connect them directly to the 12v supply to check whether the motor worked.
There was also a circuit board with heavy duty resistors on it that controlled the motor speed (along with a relay) and if the resistors were damaged the motor would not get any power. I damaged mine by not replacing the cable cover properly so there was not a sufficient cooling air flow over the resistors - came 'home' to a dreadful smell of fried electric parts.
...Now its your turn to be expansive ...
Jegs
Well-Known Member
Good day Robin,
Thank you for your time & trouble.
The model is D5l & the fan operates on start up.
Current is reaching the glow plug.
Yes it did work & the first time it failed the fan did not appear to operate: an event that has not been repeated during many subsequent attempts. this being the cause of my question relating to measuring fan speed.
The blurb indicates that there is not a lock out on this model: you simply turn off momentarily.
Boat is a Linssen & the electrical system is expertly done - for a production boat.
I have not removed the circuit board cover & will do so soon & then search around to find values of resistors to check.
There ought to be a fault finding system [connect pins 4 & 6] a sequence of long & short flashes of the green light on the rotary control, this does not work.
I only have the circuit board & heating unit in UK the rest is on boat in Belgium.
Thanks,
John G
Thank you for your time & trouble.
The model is D5l & the fan operates on start up.
Current is reaching the glow plug.
Yes it did work & the first time it failed the fan did not appear to operate: an event that has not been repeated during many subsequent attempts. this being the cause of my question relating to measuring fan speed.
The blurb indicates that there is not a lock out on this model: you simply turn off momentarily.
Boat is a Linssen & the electrical system is expertly done - for a production boat.
I have not removed the circuit board cover & will do so soon & then search around to find values of resistors to check.
There ought to be a fault finding system [connect pins 4 & 6] a sequence of long & short flashes of the green light on the rotary control, this does not work.
I only have the circuit board & heating unit in UK the rest is on boat in Belgium.
Thanks,
John G
Robin2
Well-Known Member
[ QUOTE ]
Yes it did work & the first time it failed the fan did not appear to operate: an event that has not been repeated during many subsequent attempts. this being the cause of my question relating to measuring fan speed.
[/ QUOTE ]
I'm still not sure what you mean. This sounds like the fan failed once, but appears to work normally now (though maybe at an inadequate speed). (But I'd be surprised if the fan is working without strange noises, but not at the correct speed.)
If that is true, I infer that the heater attempts to start as normal but, after a short period, shuts down. Is it it possible that the flame is not working. Have you checked (which probably means have you broken and replaced) the gauze around the heater element. I don't think its possible to remove the gauze without breaking it, so buy a new one first.
Another problem that caught me out was the tiny fuel filter in the pump unit. I have small hands and I could hardly get the tip of my little finger into it. You get at it by removing one of the fuel connectors from the pump (presumably the inlet side). It as a plastic frame - prise it out gently with a tiny screwdriver. I didn't know the filter was even there, and it blocked up almost completely.
How old is the heater? What servicing has it had? (I don't believe that dealer servicing is necessary if you are good at DIY).
Yes it did work & the first time it failed the fan did not appear to operate: an event that has not been repeated during many subsequent attempts. this being the cause of my question relating to measuring fan speed.
[/ QUOTE ]
I'm still not sure what you mean. This sounds like the fan failed once, but appears to work normally now (though maybe at an inadequate speed). (But I'd be surprised if the fan is working without strange noises, but not at the correct speed.)
If that is true, I infer that the heater attempts to start as normal but, after a short period, shuts down. Is it it possible that the flame is not working. Have you checked (which probably means have you broken and replaced) the gauze around the heater element. I don't think its possible to remove the gauze without breaking it, so buy a new one first.
Another problem that caught me out was the tiny fuel filter in the pump unit. I have small hands and I could hardly get the tip of my little finger into it. You get at it by removing one of the fuel connectors from the pump (presumably the inlet side). It as a plastic frame - prise it out gently with a tiny screwdriver. I didn't know the filter was even there, and it blocked up almost completely.
How old is the heater? What servicing has it had? (I don't believe that dealer servicing is necessary if you are good at DIY).
Jegs
Well-Known Member
Hello Robin,
The fan works without any odd noises & in warm weather operates for some considerable time.
I have replaced the gauze element located around the glow plug.
The fuel pump moves fuel; but have not removed the filter.
It is approx. 14 years old & has not had any servicing in the last four years apart from checking elecrical
circuits & replacing the relay, glow plug & gauze.
I am not clear whether you are referring to the gauze associated with the glowplug, or is there another of which I am unaware?
Once again, many thanks,
John G
The fan works without any odd noises & in warm weather operates for some considerable time.
I have replaced the gauze element located around the glow plug.
The fuel pump moves fuel; but have not removed the filter.
It is approx. 14 years old & has not had any servicing in the last four years apart from checking elecrical
circuits & replacing the relay, glow plug & gauze.
I am not clear whether you are referring to the gauze associated with the glowplug, or is there another of which I am unaware?
Once again, many thanks,
John G
Robin2
Well-Known Member
John,
We seem to be suffering from an information exchange problem. All of the information I am getting from you (or how I am interpreting it) tells me the unit is working fine.
You'll have to set out step by step what happens, and what doesn't happen.
As far as I know we are both referring to the glow plug gauze.
...Robin
We seem to be suffering from an information exchange problem. All of the information I am getting from you (or how I am interpreting it) tells me the unit is working fine.
You'll have to set out step by step what happens, and what doesn't happen.
As far as I know we are both referring to the glow plug gauze.
...Robin
Jegs
Well-Known Member
Hi Robin,
Thank for your interest.
The problem is that when I turn on it does not fire up, the voltmeter indicates that the glow plug is operating but no heat. As, I understand, there are safety elements built into the system such as the fan must operate at a certain minumum speed, my initial query was an attempt to check &, hopefully, eliminate or identify this as the cause of the fault.
John G
Thank for your interest.
The problem is that when I turn on it does not fire up, the voltmeter indicates that the glow plug is operating but no heat. As, I understand, there are safety elements built into the system such as the fan must operate at a certain minumum speed, my initial query was an attempt to check &, hopefully, eliminate or identify this as the cause of the fault.
John G
Robin2
Well-Known Member
As I said before, if the fan operates, assume it is at the correct speed (its likely to be an all or nothing thing). Based on the limited information available to me I would suspect the absence of fuel. Have you tried connecting the heater to a 12v supply while its out of the unit? Does it heat up?
When I mentioned a step-by-step description I have in mid something like this ... (bear in mind that I have forgotten some of the behaviour of my unit).
Switch-on
Click from relay after b seconds
Fan starts to turn after c seconds
Fuel pump starts after d seconds
Heater draws power after e seconds
Heater stops drawing power ....
etc etc until it shuts down automatically, or you lose patience.
Other useful diagnostic tools are smell - is there any smell of fuel (raw or burned) and sight (is there any smoke). I would expect both if there is fuel getting to the burner.
When I mentioned a step-by-step description I have in mid something like this ... (bear in mind that I have forgotten some of the behaviour of my unit).
Switch-on
Click from relay after b seconds
Fan starts to turn after c seconds
Fuel pump starts after d seconds
Heater draws power after e seconds
Heater stops drawing power ....
etc etc until it shuts down automatically, or you lose patience.
Other useful diagnostic tools are smell - is there any smell of fuel (raw or burned) and sight (is there any smoke). I would expect both if there is fuel getting to the burner.
