33
IQH3B/IQH3BQ
User Manual
Power Supply and Module Slot Locations
The IQH3B and IQH3BQ 3U Enclosures are designed to accept one or two power supplies with
independent IEC320 mains connections.
Individually, each PSU module is capable of powering the frame containing any combination
of IQ-1A/1B modules, subject to the Configuration Rules described on
. When two
units are installed, the operation of the whole frame becomes protected against single-
instance power failures. The manufacturer specifies a maximum of 50 mating cycles.
Monitoring circuitry built in to each PSU reports power or PSU fan failures via isolated relay
contacts on the STATUS connectors on the frame rear panel and the two bi-color LEDs on the
front of each power supply.
The bi-color LEDs on the PSU front panels are green if the PSU is supplying power to the rack
and the PSU fans are running, and turn red if either fails.
The LEDs are also red if the mains power to the unit has failed or if the unit is switched to
standby, provided that the other PSU is functioning.
Within the power supplies, the positive and negative rails are independently regulated and
have no minimum load current requirements.
The DC outputs of the power supplies have series Schottky diodes that allow direct connection
of multiple units on one power bus.
Additional components adjust the regulation so that the power supplies will attempt to share
the load current requirements. The balance of current sharing between supplies is subject to
variation of the basic regulation of the PSUs. With two PSUs the unit with the higher output
voltage will contribute more current to the load.
PSUs
Gateway Card
Module Slots 1 to 16
Summary of Contents for grass valley IQH3B Series
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