Message 29533 in TECH.WW
From: G8MNY
Date: Mon, 07 Sep 26 06:43:00 Z
Newsgroups: TECH.WW
Subject: META HF Millennium 810H UPS
Message-ID: <4391_GB7CIP>
Path: N2MH4|VE3KPG|GB7CIP
R:260907/0645Z 36771@N2MH4.#SENC.NC.USA.NOAM LinBPQ6.0.24
R:260907/0644Z 338@VE3KPG.#ECON.ON.CAN.NOAM BPQ6.0.25
R:260907/0643Z @:GB7CIP.#32.GBR.EURO #:4391 [Caterham Surrey GBR] $:4391_GB7CIP
From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW
By G8MNY (Updated Nov 12)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
This is some info I have found out on this Italian 100% Power Conversion UPS.
(Uninterruptable Power Supply)
The 1kW HF Millennium (810H), has 2x small paralleled 36V 7AH battery sets, so
I modified it for external batteries and front panel battery digital meter.
SYSTEM
It is not like the APC UPSs, as there is no big 50Hz mains transformer. The
with HF class D amp into 50Hz 230V @ 5A sine wave. On battery mode it has a
DC-DC inverter from 36V @ 45A to the 380V DC. The THROUGH non inverting mode,
only comes on for overloads.
Although inverting at HF all the time I could not hear any QRM on 80m with my
external aerial.
Bypass
SPEC
Input 186-264v full load, 110-265V 50% load.
Power 1kW max 4.35A resistive load. e.g. 700W max with PF 0.7 load.
Bypass mode, only used on overloads.
Efficiency 80% with 50-100% loads. (about 70W lost all the time!)
INTERNAL BATT TESTING
I did a 60W car headlamp test on each of the small 12v batteries, only 1 was
below 11V (10.9V) so I paralleled up all the batteries and put them on 13.8V
charge for a few hours to even up the charge. The 6 batteries are the standard
7AH 12v tagged type. I marked up the weak one for future reference in case it
stays weak. Currently the charge status reads 80%. (4 of the 5 LEDs on after
batt test.)
FAN FAULT
The 12V DC FAN was duff and alarms the UPS if plugged in. (brushless type draws
2A @ 12V and does not spin!). It has been running on a 27V supply, (duff reg?)
so I replace the fan with a quiet efficient 50V DC one I had rather than fault
the motherboard's fan regulator.
THE CASE
The case comes apart very strangely!
_________________________ Control Panel
24"
After removing the steel side panels, the top steel U cover comes off with 3
plug leads.
Removing the centre PCB section steel frame with 4 small screws, leaves the
heavy bottom battery tray and mains filter compartment.
CONTROL PANEL
( (1) ) ( (/) )
On Off Test & Alarm off
INSIDE _________________________ Control Panel
SOFTWARE
There are no hardware options on the UPS, all are set using software.
EXTERNAL BATTERIES
As the use is for Broadcast Studio power, which needed long mains fails times,
I wired a 60A connector block on the back directy to the PCB where the small
batteries were connected. (bypassing the 2x 30A fuses). The External batteries
are 3x 110AH & has a 60A fuse in one of the battery jumper links, so all the
heavy wiring is protected. Theoretically this gives about 3 hrs backup at full
power!
However the Battery "floats" near neutral and should not be earthed, as the
mains RCD can be tripped!
_________________________ Control Panel
METERING
I also added a cheap large digital LED Meter UP5135 50V 100A to the front panel
so Volts & Current can be measured. The meter needed 24V @ 50mA & also a
current shunt. I used a 5W 330R & 24V zener to safely drop the Battery to 24V
voltage, over 24V the LEDs went off and the volts went even higher!
Wire 0.001R
In use the meter reads 41.5V on charge @0.8A and down to 35V on discharge,
after 3 hrs allowing a good estimates of the lifetime left to be made. At 500W
mains load, 17A is drawn 82% effiecent giving the backup liftime >4Hrs.
See my buls on "APC Smart 900 UPS", "Lead Acid Batteries", "Constant Voltage
Transformers", & "Mains Power Protector".
Why don't U send an interesting bul?
73 De John, G8MNY @ GB7CIP
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