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Z-4000 Transformer: Pulsing building lights

I am confused about how much power the Z-4000 is capable of providing, as well as the circuit breaker protection.

The following occurs in two separate Z-4000 transformers - with each handle hooked up to a separate terminal strip that in turn feeds groups of O-scale buildings. When each handle is cranked up to produce ~ 11-12 volts and 4-5 amps, the building lights that the handle is powering pulse - normal brightness to less bright with a frequency of 1-2 seconds each - annoying behavior to say the least. If I lower the handle to about 10 volts and 3-4 amps, the lights will stay steady (but some flashing signs need 12 volts, thus I need to figure out what's going on). Note: accessory terminals are not being used.

I was under the impression that each throttle of a Z-4000 had a 10-amp circuit breaker, and therefore each handle could go up to 10 amps. However, based on this pulsing, I am thinking the entire transformer is rated at 10 amps - because as I approach 9-10 amps (total amps from both sides of the transformer) the unit is reaching capacity and this pulsing is some sort of maxed out behavior.

Or, what could be causing this?

Note: I have short length (3 ft) 16 gauge wire from transformer terminals to terminal strip - and building wires (around 22 gauge) that vary in length from 1 to 4 feet connected to terminal strip.

 

 

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OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
330-757-3020

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