Valve solenoid problems
Valve solenoid problems
(OP)
I have a customer that has had 2 sets of valve solenoid coils burn out, repeated in about 6 weeks. These are 4 way, 2 position, double solenoid hydraulic valves. They are PLC output driven thru individual fuses.
I have checked voltage levels, OK. I have made sure both solenoid coils are not energized at the same time. When I check current, it was within manufacturer spec's.
Any ideas on what to check next?
I have checked voltage levels, OK. I have made sure both solenoid coils are not energized at the same time. When I check current, it was within manufacturer spec's.
Any ideas on what to check next?





RE: Valve solenoid problems
How often are the coils turned ON, how long do they stay ON, and how long are they OFF?
Does the PLC, intentionally or not, drive the coils with a PWM signal?
Are the coils rated for continuous duty, or for the duty cycle that's actually applied?
Mike Halloran
Pembroke Pines, FL, USA
RE: Valve solenoid problems
During machine operation, they could be on for 10 seconds every 30 seconds. The PLC uses triac outputs to switch 120 VAC to valves. The valves are supposed to be continuous duty.
I rebuilt the machine about 8 years ago, and no problem till now.
RE: Valve solenoid problems
Mike Halloran
Pembroke Pines, FL, USA
RE: Valve solenoid problems
Bill
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"Why not the best?"
Jimmy Carter
RE: Valve solenoid problems
Mains voltage distortion, reduced mains voltage, low temperature, other triac, removed snubber, new coil with "better" specs (lower current consumption) are possible reasons for that kind of problem.
Gunnar Englund
www.gke.org
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