HSF 300W 042315
7
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VDC ON/ALARM indicator. Lights green when unit is operating. When enabled by DIP switch config-
uration, lights red to indicate loss of output voltage in parallel configuration only (see PAR. 3.7.1).
•
V.ADJ Output voltage adjustment trimmer: Adjusts output voltage within limits specified in Table 2
(see PAR. 3.4.1). Not functional if remote voltage control is enabled (see PAR. 3.4.2).
•
TEST POINT (+, –): Connect to voltmeter to monitor d-c output voltage.
•
OUTPUT RESET switch. Used to recycle power in the event of an alarm condition (see PAR. 3.6).
Not functional when remote on/off control is enabled (see PAR. 3.5).
•
POWER ON/OFF switch. Applies power to the unit.
CAUTION: Power must be OFF before unit is
removed from the rack adapter.
•
Retaining Latches (2). Prevents inadvertent removal of unit from rack adapter (see PAR. 3.10).
FIGURE 5. FRONT PANEL CONTROLS, INDICATORS AND TEST POINTS
3.4
OUTPUT VOLTAGE CONTROL
Output Voltage can be controlled from either the front panel (PAR. 3.4.1) or externally using a
trimpot or voltage source (PAR. 3.4.2).
3.4.1 FRONT PANEL VOLTAGE CONTROL
Output voltage can be manually adjusted with the voltage adjustment control, Vadj (see Figure 5
for location) when DIP switches SW1 and SW2 (see Figure 4 for location) are configured as
shown in Figure 6A (factory default) To adjust voltage, first place the unit under an operating load.
Then monitor the (+) and (–) test points on the front panel with a precision voltmeter and turn the
voltage control to the desired operating value. Refer to Table 2 for the recommended Adjustment
Range of all the HSF 300W Models.
3.4.2 REMOTE VOLTAGE CONTROL
For remote voltage control, set positions 1, 2 and 7 as shown in Figure 6B. This removes control
from the front panel Vadj control and allows the output voltage to be adjusted by either an external
trimmer pot (resistance) or by an external variable voltage source connected across the rack
adapter I/O connector pin 12 (RV, Remote Voltage) and pin 10 (–COM, Common) as shown in
Figure 7. At the rack adapter I/O connector use a shielded wire 6.6 feet (2M) maximum in length,
for connection of REF (pin 2), RV (pin 12), and –COM (pin 10) to the trimmer control or external
voltage source.
3043322
VDC ON/ALARM Indicator
V. ADJ Output Voltage Adjustment Trimmer
TEST POINT (+)
TEST POINT (-)
OUTPUT RESET switch
POWER ON/OFF switch
Retaining Latches
