Power Supplies - ATX DigiVu II Series Hardware Interface Manual

CHAPTER 4: INSTALLATION
4 .8

Power Supplies

Power supplies for AC and DC operation are available as options and each may be ordered in a redundant supply version.
The following points must be taken into account when installing the Device and connecting power.
4 .8 .1 AC Power Supplies
Both the standard single power supply and the optional redundant AC power supplies are auto-sensing switching type power
supply systems which may be operated on input voltages from 115 VAC to 230 VAC. There is no need to confi gure the power
supplies to operate on any voltage in this range. Power cords appropriate to the locale are supplied.
Figure 4-7: Single AC Power Supply
4 .8 .2 DC Power Supply and Termination
The optional redundant DC switching type power supply system is intended to operate on nominal -48 VDC power systems
but functions between -40 and -72 VDC. A pair of insulated #12 AWG DC power wires must be fi eld installed for each of the
two modules using permanent wiring methods. Wire insulation colors must be different for each of the two conductors clearly
indicating the polarity of the voltage, see Figure 4-9. It is recommended that stranded conductors be used for DC power and
that RED wire be used for the 0V conductor and BLACK for the -48V conductor. Ring or spade terminals may be used and it
is also permissible to strip the wire 8mm, twist the stranded conductors tightly and clamp the wire in the provided wire clamp
as illustrated in Figure 4-9.
Figure 4-9: DC Power Module Connections
4 .8 .3 DC Power Disconnect
Each DC power module should be externally fused or otherwise adequately protected at no more that 10 Amperes and
must be provided with it's own external readily accessible disconnect device. Each disconnect must be prominently labeled
indicating the units being powered and with adequate instructions for the removal of all power from the unit being serviced.
The disconnect must be turned off for BOTH power modules before removing supply wires from the module terminal blocks
when replacing a power supply module or otherwise servicing the unit.
4 .8 .4 Power Supply Redundancy
For the redundant power supply options, either power module on its own can provide the required power safely if one fails. To
retain the redundancy feature, replace a failed power module as soon as possible. A power module failure or the failure of the
supply current or protection fuse will be indicated by an audible alarm within the encoder power modules and the green power
status LED on the power module will be extinguished. Silence the audible alarm with the red rear panel Alarm Reset switch
adjacent to the power supply modules, Figure 4-10.
4-8
Safety Ground
Figure 4-8: Redundant AC Power Supply
Gnd
VersAtive
®
Removal Latch Safety Ground
Mute Alarm
Power Indicators
Latch -48Volts In
Gnd
0Volts In
Figure 4-10: Redundant DC Power Supply
Pro, DigiVu II, DigiStream – 1RU Hardware Interface Manual
®
Safety Ground
Mute
Alarm