Help on Symmetra 40K Not synchronized fault.

[Anonymous user]

When the UPS transfers to battery once on battery it never transfers to generator power. Looking at the UPS log when generator is on the log shows 52.57 Hz and I get Not synchronized fault and sight wiring fault on the UPS. The settings on the ups are Output Frequency Range: 60 +/- 3.0 Hz.

Message was edited by: Total Plastics

[BillP]

Any time a UPS reports a "Site wiring fault" it is usually due to one of three things.

1) Phase Rotation - The UPS requires ABC clockwise rotation- perhaps the wires from the generator to your transfer switch (or transfer switch to UPS) need to be reversed.

2) Missing Neutral - The UPS must always be provided a proper Neutral. Ensure that while on generator, your UPS is still being supplied a Neutral derived from the input ground.

3) Phase Sequence - Ensure the phase sequence (A-B-C) coming from the Generator/transfer switch matches the sequence you get when on normal utility.

(I have seen false frequency readings before when the above are not correct)

Also, I assume this not to be the case, but please confirm that your generator is not actually putting out 52 Hz?

[Anonymous user]

I have the same message on Smart-UPS VT 40 kVA:

***Not Synchronized Fault***
***A phase synchronization fault exists.***

In the Status view the readings are like this:

Power
Phase L1
Phase L2
Phase L3Input Voltage:
220.2 VAC
216.2 VAC
216.7 VACBypass Input Voltage:
220.1 VAC
216.4 VAC
216.5 VACOutput Voltage:
231.1 VAC
230.7 VAC
230.9 VACCurrent:
13.17 Amps
14.15 Amps
13.58 AmpsFrequency:
54.39 Hz

Is anything wrong with my input?
Can you suggest a solution?

By the way, in the Operation manual (http://www.jade-power.com/apc/apc_pdf_eng/SUVT_ASTE-6Z5S5P_R0_EN.pdf)
the solution is Decrease the input frequency sensitivity. But it's not written anywhere about HOW TO DECREASE SENSITIVITY !!!*
Can you guys help on that?

------------------------------ CITATION FROM THE MANUAL ------------------------------------------------------
Display message:
System Not Synchronized to Bypass.

Meaning:
System cannot synchronize to bypass. Mode may not be available.

Corrective Action:
Option 1: Decrease the input frequency sensitivity. Contact APC Customer Support (see rear cover).
Option 2: Correct the bypass input voltage to provide acceptable voltage on frequency
-------------------------------------------------------------------------------------------------------------------------

[upsguy_apc · Accepted solution]

Your input freq is 54.39hz which is to low. I would have someone check the input freq to see if it is actually that low. It should be 60.00 hz

I would not adjust the freq window... it may already be at its max. You have a 40kw UPS and if there is to much phase shift between the UPS output and bypass, in the event of a UPS failure you could have an extremely high amount of exchange current which would probably cause output fuses to blow.

Are you only seeing 54 hz while the UPS is running on generator?

Message was edited by: upsguy