19
DC Power Supply Precautions
The following precautions should be observed when installing chassis with DC power
supplies.
1.
Check nameplate ratings to assure there is no overloading of supply circuits that
could have an effect on overcurrent protection and supply wiring.
2.
When installing 51 to 57 VDC rated equipment, it must be installed only per the
following conditions:
a.
Connect the equipment to a 51 to 57 VDC supply source that is electrically
isolated form the alternating current source. The 51 to 57 VDC source must
be connected to a 51 to 57 VDC SELV source.
b.
The maximum terminal voltage is 57 VDC.
c.
Input wiring to terminal block must be routed and secured in such a
manner that it is protected from damage and stress. Do not route wiring
past sharp edges or moving parts.
d.
A readily accessible disconnect device, with a 3mm minimum contact gap,
shall be incorporated in the fixed wiring.
3.
Grounding: reliable grounding of this equipment must be maintained. Particular
attention should be given to supply connections when connecting to power
strips, rather than direct connections to the branch circuit. The Negative
Terminal is common to the grounded case.
4.
-48 VDC cannot be supported.
Troubleshooting
If the PoE+ Giga-MiniMc is not responding to the power provided to it, the following
conditions may be responsible:
•
There may be an overcurrent condition; this is indicated on the PSE LED by a
series of two flashes.
•
There may be an invalid low or high discovery signature resistance; this is
indicated on the PSE LED by a series of five flashes.
•
If the PoE injector has power that can be verified, but the PSE LED is off, then
contact IMC Networks technical support.
