If the temp comp probe isn't connected, it assumes 25C/77F, IIRC. I
would definitely not run it without the temp probe unless this is in a
NOC or controlled shelter type environment.
There's a jumper that controls the battery type in use. Gel for gel, SLA
for VRLA, AGM, etc. That also does something with the LVD, but I don't
remember what. The temp compensation also has an effect on the LVD. It's
all microprocessor controlled.
With the remote cable connected and batteries + temp sensor
disconnected, adjust the pot on the BCM (not the power supply) for your
desired float voltage with a meter on the battery terminals. I usually
set it to 27.6. Do not touch that potentiometer with the sensor,
batteries or load connected.
Power everything off then connect the temp probe and batteries. Power it
back up. Like Ken said, the BCM adjusts the TSP power supply output
voltage. Check battery output voltage at the BCM, look at your shunt
reading or clamp-on ammeter, etc. You should see 1 amp (that's the BCM
current limit) if the batteries are <90% or so.
The LVD will cut off at 1.83 volt per cell for SLA. The BATT-OK contact
will open slightly before the LVD kicks in as an early warning (awesome
feature). So 22V for the BCM24 and 44V for the BCM48. That is very, very
conservative if you ask me, especially for a UPS. The batteries are not
being cycled daily like solar. AGMs can be taken down very deep in a
typical UPS situation and not sustain any damage or loss of capacity.
Again, this is not solar.
The Mean Well AD-155 LVD is much lower. Like 19.5V for the 155B, IIRC.
Fine with me since I put those at smaller sites with smaller batteries,
and they're cheap batteries, so if it ruins them, oh well, replace.
On 4/8/2015 5:54 PM, Ken Hohhof wrote:
With the Traco setup, the BCM controls the power supply voltage to be
what is needed to charge the batteries. The loads get that same
voltage, so the output will be 27 or 28 volts not 24.
Is there a possibility the battery remote temperature probe is not
connected correctly or is bad? I don't know what happens if that is
open. Some chargers will assume 27*C if the probe is missing, I don't
know what Traco does.
-----Original Message----- From: Bill Prince
Sent: Wednesday, April 08, 2015 5:02 PM
To: af@afmug.com
Subject: Re: [AFMUG] Low Voltage Disconnect
I've never used this setup, but with the chargers/controllers I've used,
the output of the power supply has to be greater than 24V. In fact,
doesn't the output of the power supply have to be at least 28 or 28.5
volts? This would allow the battery controller to modulate the output to
the batteries, whether it be bulk, absorption, or float?
bp
<part15sbs{at}gmail{dot}com>
On 4/8/2015 1:27 PM, Christopher Tyler wrote:
Attached is a picture of the setup as it is now. 24 supply and 24v
loads, everything feeds through the Meanwell regulator.
I followed the instructions from Traco, but as you can see the
battery is currently at about 23v and that is what the Traco power
supply is outputting. The instructions say to turn the power supply
all the way down and to let the BCM control the output. It's all set
up, jumper is in position 1, the feedback cable is connected between
the PS and the BCM but the BCM doesn't appear to be telling the power
supply to do anything except turn on.
Anyone with some experience with Traco care to tell me what I'm doing
wrong. It's worked like this since day one, the BCM doesn't appear to
be doing anything regardless of the battery voltage.
