10
HSF (M) 600W 042315
RESISTANCE: Connect the external trimmer as shown in Figure 7A. Suggested value for the trim-
mer control is 5K ohms. NOTE: Output voltage may not adjust to 0V due to residual trimmer resis-
tance.
For M Models only:
Resistor R (see Figure 7A) is used to obtain minimum output voltage
required to ensure proper operation of the alarm relay and LED indicator; see Table 4 for values.
VOLTAGE. By adjusting an external 0 to 6V voltage source (0 to 5.5V for the 48V model), the HSF
power supply output voltage can be adjusted as specified in Table 2.
For M Models only:
To ensure proper operation of the alarm relay, meter and LED indicators, do
not adjust external voltage below minimum listed in Table 4. Connect the voltage source across the
RV and –COM pins as shown in Figure 7B.
For MZ Models only:
The meter and relay are powered internally and are not dependent on HSF
output to maintain function.
FIGURE 7. CONNECTIONS FOR REMOTE VOLTAGE CONTROL
3.4.3 MZ MODELS ONLY: VDC ON/ALARM INDICATOR FUNCTION
To use the internal power supply reference voltage to power the VDC ON/ALARM indicator, set
Position 7 of SW1 to ON and Position 8 of SW2 to OFF (default) (see Figure 8A). Load effect is
±1% maximum. To use the HSF output voltage to power the VDC ON/ALARM indicator, set Posi-
tion 7 of SW1 to OFF and Position 8 of SW2 to ON (see Figure 8B). Load effect is ±0.6% maxi-
mum, however the minimums specified in Table 5 must be observed for the indicator to function.
Table 5 lists the minimum HSF output voltage required to maintain VDC ON indicator function for
this case. Maximum output voltage of unit might cause overvoltage trip if SW2, position 8 is
enabled. If this occurs, turn Vadj trim pot counterclockwise to reduce output voltage, then reset the
unit.
TABLE 4. M MODELS: MINIMUM CONDITIONS FOR RELAY, METER AND LED OPERATION
MODEL
HSF 12-53M
HSF 15-43M
HSF 24-27M
HSF 28-23M
HSF 48-13M
Minimum HSF output voltage required for relay, meter
and LED functioning (Volts d-c)
1
9.0
11.5 17
21.5
35
Minimum resistance of Limit resistor R (Figure 7A) in
series with 5K ohm Trimpot to ensure proper operation
of LEDs, meter and relay (Ohms)
1
9.1K
9.1K
7.5K
9.1K
10K
Minimum external voltage (Figure 7B) to ensure proper
operation of LEDs, meter and relay. (Volts d-c)
1
3.8
3.8
3.6
3.9
3.4
Voltage source range (Volts d-c)
3.8 - 6
3.8 - 6
3.6 - 6
3.9 - 6
3.4 - 5.5
1
- If operating below minimums listed, see PAR. 3.8.2.2 to implement ±PF alarm signals to monitor power supply status.
NOTES:
1. SEE TABLE 4 FOR MINIMUM
EXTERNAL VOLTAGE VALUES.
2. SEE TABLE 4 FOR MINIMUM
RESISTANCE VALUES.
