Simons Voss Technologies SmartRelay 3 Manual page 179

SmartRelay 3 system
*) Undervoltage at the reader with PoE supply
When the controller is powered via PoE, a voltage converter reduces the PoE supply voltage to
13V. This voltage is available for supplying the connected readers and may not be sufficient for
long cables or too small cross-sections to ensure trouble-free operation of the reader (see also
Information on cabling [
1. Use an external power supply for the reader.
2. Use an external power supply for the controller, whose voltage significantly exceeds 13 V
increase the internal supply voltage. This also increases the supply voltage for the reader and
the voltage drop on the line no longer has any effect.
3. Shorten the cable length.
4. Increase the cable cross-section.
(Manual)
IMPORTANT
Malfunctions due to interference
Sources of interference may impair functional reliability.
1. Observe the installation instructions (see
2. Use shielded twisted pair cables.
3. Connect the cable shielding to the earth potential.
178]
). Take one of the following actions:
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You can use the form to calculate sparkover for copper cabling. The form
takes into account the maximum length which is calculated based on the
voltage drop. It does not check any other sources of interference such as
transfer resistances or electromagnetic interference fields, which limit the
maximum cable length to 300 m. The following formula is used:
The result is the maximum length, which is calculated based on the voltage
drop. This length comprises a forward and return path. You should use an
own power supply unit to increase operational reliability if the cable is more
than 75% of the maximum calculated length.
Enter the following values into this form:
14. Technical specifications
Installation [ 98]
).
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