ESP Safety UPES-50D, Руководство по эксплуатации, Страница: 12 / 51

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Front Panel LED Indicators
The front panel contains LEDs of each of the eight channel modules:
1 - green LEDs indicating turning on of + 24V at the output of the channel
2 - red LEDs indicating the 1-st threshold
3 - red LEDs indicating the 2-st threshold
4- blue LEDs indicating the RS-485 bus lines state
5- yellow LEDs indicating the sensor faults
RS-485 bus line state indication LEDs are turned on at the time of receipt of request from the
channel board to the sensor and are turned off at the time of the receipt of the correct answer
from the requested sensors or upon the expiry of the set time of waiting for a response from the
sensor.
Light up of one of the "Fault" LEDs indicates a failure of one of the sensors in the bus line, or
the absence of response from one of them within the prescribed period of time.
At the back of the UPES there are screw terminal connectors to connect the bus lines from
sensors and cables from the external actuation devices (fans, valves, buzzers, etc.). There are also
mount hole for connecting the network and backup power supply and link with PC through RS-
485 communication channels.
Structurally, the UPES is a unified frame in size of 3U × 19 " (482 × 266 × 132 mm) built in
accordance with the bus structured and modular approach. In the frame there is a power supply
module, CPU module and up to eight two-channel modules. The power supply provides a relay
switch of main supply to 24 VDC reserve power supply.
In the power supply the primary main power supply takes precedence over the primary reserve
power supply for the detector. In the absence of ≈ 220V 50 Hz or in case of the failure of the
primary main power supply, the power supply unit ensures smooth transition to the reserve
supply, generating a sound signal and light indication on the UPES front panel (built-in red and
green LEDs in the UPES power buttons).
UPES is switched ON by continuous (2 sec) pressing on the power button on the front panel of
the device after the feeding of the primary and reserve power supply.
The power supply unit controls voltage outputs of primary power supply transducers and ply and
current consumption from them, compliance with the predetermined voltage limits of all the
reserve power supplies. Overrun of predetermined parameters is signaled by red light indication
on the UPES front panel, as well as sound signals with a simultaneous 24 V supply voltage
dump.
The power supply monitoring system has a separate secondary power source and a 5 V back-up
source with estimated operating time up to 30 seconds.