HSF(A) 300W 040215
15
FIGURE 12. ±PF POWER FAILURE OPTOCOUPLER TIMING DIAGRAM
3.8
LOCAL/REMOTE SENSING
HSF (A, AM) 300W Power Supplies allow remote error sensing which can compensate up to 0.4
Volts per load wire. Local/Remote error sensing is configured by means of separate DIP switches
mounted on the RA 19-4C Rack Adapter (see RA 19-4C Rack Adapter Operator Manual). Either
local or remote sensing MUST be used, otherwise the units will not operate.
3.9
RETAINING LATCHES
HSF (A, AM) 300W series power supplies are provided with (2) retention latches located at each
side of the bottom edge of the front panel (see Figure 5). These latches work in conjunction with
the RA 19-4C rack adapters to prevent unauthorized or inadvertent module extraction from an
operating power system. The latch is engaged by loosening the cap-head screw approximately 1/
2 turn CCW (use 5/32” hex key) and sliding the latch down to the bottom of the slot, then retight-
ening the cap-head screw CW until snug. DO NOT OVERTIGHTEN! To release, follow the same
procedure, except lift the latch to the top of the slot. Be sure to move the latch completely up or
down to ensure full engagement and disengagement of the latching mechanism. When the HSF
(A, AM) power supply is not installed in its plug-in rack adapter, it is recommended that the latch
be secured in the open (up) position to prevent damage.
NOTE: Retaining latches must
not
be used to secure the HSF (A, AM) power supply in the rack
adapter for shipping purposes.
