ESP Safety UPES-50D, Operating Manual, Page: 14 / 51

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To connect the UPES to the PC via the RS-485 communication the shielded twisted pair can be
used.
The external grounding conductor shall be thoroughly cleaned, and its connection with the
external grounding clamp shall be protected from corrosion by applying lubrication grease.
The control panel shall be grounded with a screw clamp located at the bottom of the back wall of
the power supply unit.
At the end of the installation it is required to check:
- insulation resistance, that shall not be less than 0.5 MOhm;
- resistance of the earthing device, that shall not be more than 4 Ohm.
UPES Installation Clearance Consideration
When installing the control panel in a rack there shall be empty space above it and below it that
shall be at least the height of the control panel (132 mm).
System Functionality
Connect the UPES to the detectors and verify its functionality.
For this purpose it is required to release two screws at the top of the front panel of the device,
unscrew the front panel and press ON.
After switching ON the UPES, the central board processor determines whether channel cards are
available. The ("Initializing channels") appears on the display (Fig. 1).
Figure 1. Cyclogram of the messages displayed on the display when UPES is initialized