Caterpillar synchronization
Caterpillar synchronization
(OP)
I have two Cat 3512BDITA 1.5MW DEGs with EMCP II and ADEM controls. We need to synchronize the outputs to a utility source (without actually paralleling) so that static switches supplied from the generator and the utility source can operate in fast transfer mode whenever possible.
Does anyone know if this controls package has synchronization capability?
Thanks,
Does anyone know if this controls package has synchronization capability?
Thanks,
Alan
"The engineer's first problem in any design situation is to discover what the problem really is." Unk.






RE: Caterpillar synchronization
The speed brick is normally provided for single unit operation with an EMCP mounted speed adjust potentiometer to allow the operator to adjust speed.
The LSM option is provided for units paralleling with the Woodward load share lines type network. The LSM has a sync input circuit compatible with Woodward (and similar type) synchronizers.
Hope that helps, Mike L.
RE: Caterpillar synchronization
RE: Caterpillar synchronization
Dave - I assumed that any time there is a significant change in load, synchronization will probably be lost until the governor "catches up". This is a request from my client and I'm not sure how well it may work. My thought on response after transfer is that loss of sync wouldn't matter until it's time to transfer back. Any further input is appreciated.
Alan
"The engineer's first problem in any design situation is to discover what the problem really is." Unk.
RE: Caterpillar synchronization
Depending on how you are going to try and maintain sync speed, the input to the speed brick is 0-5 VDC and I have used a PLC output to drive it in some systems. Note the speed range has to be set in the ADEM ECM to meet you actual needs. The ECM will detect a speed reference (throttle signal) fault if the PWM signal is below 5% and above 95%. If the throttle signal is out of range the ECM will drive the engine speed to the programmed idle setting.
Are the units going to be paralleled with each other while islanded from the utility? Tweaking the speed reference will affect the units load sharing if so. If this is the case then you may want to consider a system like a Woodward DSLC on each unit with frequency trim enabled.
Mike L.
Phoenix also makes a multifunction signal convertor that can provide a speed reference signal (500 Hz PWM) to a CAT control, don't have the part number handy but if you need it let me know and I'll dig it up. Axiomatic also makes signal convertors that will provide the correct speed reference signal.
RE: Caterpillar synchronization
RE: Caterpillar synchronization
FreddyNurk - No. This is an existing system. The generators are isolated from each other and from the utility. The static switches are downstream of a UPS. Synchronization is being attempted the static switches can operate in fast-transfer mode.
Alan
"The engineer's first problem in any design situation is to discover what the problem really is." Unk.
RE: Caterpillar synchronization
This system sounds like it may introduce more failure modes than it eliminates...?
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