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Sir Constantine . . . . . . . .
If this was my problem to solve my primary researching would be to initially see what potential power demands are being made on those two supplys.
To get a stable 12 VDC I would be using 8 C or D cells for that supply source, which would be creating a completly " floating " 12 VDC supply.
For the" floating " 5VDC supply, use 4 separate cells with an end connected . . . .2 series connected 1n400X series diodes for corrrecting for that excess
voltage , by voltage loss thru their junctions.
Initially read the 5V supplys resultant end voltage with the machine powered up and if too low, eliminate that one extra diode.
The reason being, that this would be a bit "iffy" in not initially knowing the current that the diodes will be passing thru them.
(I'm not expecting much of a current need on that supply.)
The 12 VDC supply will typically be needing one relay and potentially another relay in use, along with an occassional use of yet a third relay . . .like the initial
water fill solenoids.
Once you know the typical power neeed of those two supplies, then there is the option of your drawn circuitry, or use already UL/CSA approved wall wart types of supplies
of twice or three times the rated power usage for some cooling threshold safety.
The manufactured units will be providing a secondary supply voltage , completely isolated from the Mains hot line.
Observations:
Omron G2RL-1A-E-HA
12VDC @ 33 ma coil consumption
Omron G5LB-1-HA
12VDC @ 33 ma coil consumption
(Looks like this relay is obsolete and they are recommending
using a G5LA or G5LE series, with its heftier contacts)
The BLUE relay is the heftiest of the relays, and is probably the
motor switching function.
However . . . . it is assuredly being a Solid State Relay, with that
mere 10 ma at 5 V spec for its power.
Overall now . . . in looking at the magnetic core footprint of the original
SMPS transformer and the combined relay coil utilization's.
There may be only the need of 1/4 amp from those supplies.
Do you need that machines main schematic ?
( You had better hurry in getting that machine going again, as Mamma's getting tired of hand washing your clothes.)
Aside:
Sir Alec t . . .in your Post #23 . . I am seeing need of the labeling of the LINE and NEUTRAL being switched.
As it is drawn that then puts the sub power supplies at 220 VAC potential.
Referencing after changing that, then has the neutral at ground potential, with the secondary supplies having reference to that same ground neutral also.
So nothing is at an AC shock hazard as regarded to touching the secondary power supplies.
A ground is a ground is a ground on the AC line as it is also a ground being common on the small power supplies.
Now the only thing left weird, is the person who drew /designed this schematic/circuitry and his assignment of - 5 and - 12 to the supplies . . . . . . .he is being a drummer . . .with his own beat.
73's de Edd.
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