HSF (M) 300W 042315
11
“high” and 0.0 to 0.4V “low”), or a contact closure. When the ±RC pins are open, using either a
mechanical switch or a high level logic signal, the HSF output is cut OFF. When the ±RC pins are
shorted, the output returns to within specifications. At low level logic, the maximum source current
is 1.6mA and at high level the sink current is 1.0mA. Positions 3 and 4 of both DIP switches must
be restored to the factory default setting (Figure 9A) if remote ON-OFF is not used. The ±RC pins
are isolated from DC output pins and a-c input terminals.
FIGURE 9. DIP SWITCH SETTINGS FOR USING RESET BUTTON OR REMOTE ON-OFF
3.6
RESET (RESTART)
There are three ways to reset the unit:
•
If remote on/off feature (see PAR. 3.4.3) IS NOT in use, press and release the OUTPUT
RESET switch on the front panel.
•
If the remote on/off feature IS in use (see PAR. 3.4.3), open the connection between the
±RC pins and then reconnect the pins.
•
The unit may also be restarted by turning the POWER ON/OFF switch to OFF, waiting
40 seconds, then setting the POWER switch to ON.
3.7
PROTECTION CIRCUITS
The following protection features are implemented in the HSF 300W Series M and MZ Models:
overvoltage and overtemperature (PAR. 3.7.1), overcurrent (PAR. 3.7.2), fan failure (PAR. 3.7.3),
and undervoltage (PAR. 3.7.4). The HSF provides a configurable visual alarm (see PAR. 3.8.1) as
well as an option to use either relay contacts or logic levels for alarm signals (see PAR. 3.8.2)
3.7.1 OVERVOLTAGE AND OVERTEMPERATURE PROTECTION
When the output voltage of the HSF increases beyond the specified values (see Table 2), the out-
put is cut OFF and the fan turns OFF. After shut down, reset (restart) the unit per PAR. 3.6.
When the internal temperature of the HSF increases beyond allowable limit, the output is cut OFF
and the fans turn OFF. The restart cycle (Power ON) should not begin until the temperature
returns to within specifications. To restart (reset) the unit, set the POWER ON/OFF switch to OFF,
wait until unit cools, then set the POWER switch to ON. The power supply cannot be reset using
the remote ON-OFF feature unless the power supply remains shut down for at least 40 seconds.
3042877
3
3 +RC
+RC 3
3
SW1
-RC 4
4
SW2
4
4 -RC
OFF
ON
OFF
ON
(FACTORY DEFAULT)
USE FRONT PANEL
RESET BUTTON
A
B
(LOGICAL LEVEL OR
MECHANICAL SWITCH)
USE REMOTE ON-OFF
3
3
SW2
SW1
4
4
ON
OFF
OFF
ON
3 +RC
4 -RC
+RC 3
-RC 4
TAB
