8
HSF (M) 300W 042315
•
VDC ON/ALARM indicator. Lights green when unit is operating. Both M and MZ models permit
selection of indicator power, either from HSF output or internal reference (see PAR. 3.4.3). When
enabled by DIP switch configuration, lights red to indicate loss of output voltage in parallel configura-
tion only (see PAR. 3.8.1).
•
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. 3.4.3).
•
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).
•
Voltage/Current meter: Monitors output voltage or current according to setting of Meter Mode
switch. NOTE: Use remote sensing for voltmeter to display voltage at the load.
•
Meter Mode slide switch: Set to V for display to show output voltage, set to A to show output current.
•
V indicator: Lights green to indicate meter is showing Volts.
•
A indicator: Lights amber to indicate meter is showing Amperes.
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 M and MZ 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
3043129
Retaining Latches
POWER ON/OFF switch
OUTPUT RESET switch
TEST POINT (-)
TEST POINT (+)
V. ADJ Output Voltage Adjustment Trimmer
VDC ON/ALARM Indicator
Voltage/Current Meter
Meter Mode switch
V (Voltage) indicator
A (Amperes) indicator
