Installing And Removing Power Supply Units; Removing A Power Supply Unit; Installing A Power Supply Unit - GRASS VALLEY IQH4B User Manual

The bi-color LED on the PSU front panel is green if the PSU is supplying power to the rack and
the PSU fans are running. It turns red to indicate PSU fan failure, mains input under or over
voltage range, internal DC regulator failure, or over temperature.
Within the power supplies, the positive and negative rails are independently regulated and
have no minimum load current requirements.
The power supplies 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.

Installing and Removing Power Supply Units

The IQH4B enclosure is provided with two PSUs as standard to allow dual redundant operation.

Removing a Power Supply Unit

To remove a power supply unit:

Installing a Power Supply Unit

To install a power supply unit:
30
Note: Ensure that the mains power connection at the rear of the unit is
removed before these operations are attempted.
1 Open the front door panel.
2 Lift the catches at the front of the PSU (shown below) and pull handle forward.
Lift catches and
pull handle forward
3 Pull handle firmly and carefully slide out the power supply.
4 Close the front panel.
1 Open the front door panel.
2 Ensure the power supply's orientation is correct.
3 Slide power supply into the frame, push home firmly and place the handle back in the
closed position.
4 Close the front panel.