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AWZ502
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AW – technical output indicating PSU status:
the OC type output indicates the PSU failure. In normal
state (during correct operation) the output is in high
impendence state – hi-Z. In case of incorrect operating
parameters (voltage, current, temperature), the output is
ground fault (L state – 0V)
Fig.5. Electrical diagram of the OC outputs.
•
TAMPER - output indicating tampering with the PSU. The output’s volt-free (potential-free) contacts
indicate PSU door status and mounting to the surface:
- unit closed and mounted: NC,
- unit opened or mounted incorrectly/detached from the mounting surface: NO
4. Operation and use.
4.1 Overload or short circuit of the PSU output
The AUX output is equipped with a protection due to a PTC polymer fuse. If the load of the PSU exceeds
I
max
(load 110% ÷ 150%
@25ºC
of the PSU power) the output voltage is automatically cut off and indicated by the
green diode going out. To restore the output power and to protect the PTC, cut off the output load for approximately
1 minute.
In the case of a short-circuit to the AUX, BAT output (load 200% ÷ 250% of the PSU power) or a reverse
polarity connection, the F1 fuse in the battery circuit becomes permanently damaged and the restoration of the
voltage at the BAT output requires replacement of the fuse.
4.2 DC output over voltage protection (OVP)
In case of voltage exceeding 16.5V±0.2V at the regulator’s output, the system cuts off the power at the
outputs to protect the battery and the receivers from damage. The outputs will be battery-powered. The protection
system is indicated by the red LED on the PSU panel. After pressing
, the SEr code will be displayed.
4.3 Battery-assisted operation.
Immediate battery reverting in case of main power outage.
In order to run the PSU from the battery only, connect the BAT connectors in accordance with the signs:
+ BAT red to ‘plus’ and, - BAT black to 'minus’ then press the START button on the main board and hold
it for 5 seconds.
In order to turn off the PSU while battery-assisted operation, press the STOP button on the main board and
hold for 2 seconds. The OFF sign will appear on the display, the PSU will disconnect the output after 10 seconds.
The PSU is equipped with a discharged battery disconnection system (UVP), set by AKU: Z3, Z4
jumpers. The battery protection is active when both jumpers are on.
4.4 Battery-assisted operation – standby time
To keep the standby time, the current drawn from the PSU during batter-assisted operation should be
limited.
Characteristics for
17Ah/12V SLA
- for step 1 (8h), current Id= 1,7A
- for step 2 (15h), current Id=0,9A
QAKU = 1.25*[(Id + Iz)*Td] – basic formula
where:
QAKU - battery capacity [Ah]
1.25 - factor that allows for capacity loss due to its ageing
Id -current drawn by the receivers during inspection [A]
Iz -current drawn for PSU's own requirements [A]
Td - required inspection time [h]
4.5 Dynamic battery test
The PSU runs a battery test every 20 minutes. It is done by a momentary output voltage reduction and
voltage measurement at the battery terminals. A failure is indicated when voltage drops below
12V. Not to prolong
the loading process, the test will not be held if the battery charging current does not drop below 0.6A. The battery test
facility can be switched off if, for instance, the battery is not connected to the PSU.
Summary of Contents for AWZ 502
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