B&B Electronics 857-11911--29 - Manual - Manual (Page 11)

8
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 45 to 57 VDC rated equipment, it must be installed only per the
following conditions:
a. Connect the equipment to a 45 to 57 VDC supply source that is electrically
isolated form the alternating current source. The 45 to 57 VDC source must
be connected to a 45 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
• PWR LED glows green when the unit is powered. If this LED is not lit, contact
IMC Networks Technical Support.
• If the PSE LED flashes twice, it may indicate an over current condition. The PSE
LED should maintain solid green, to indicate consistent power. Check the PD
device and its requirements.