12
HSF (M) 600W 042315
3.6
RESET (RESTART)
There are three ways to reset the unit:
•
If remote on/off feature (see PAR. 3.5) 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. 3.5), 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 600W 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
If the output voltage of the HSF increases beyond the specified values (see Table 2), the output is
cut OFF and the fan turns OFF. To restart (reset) the unit, press and release the OUTPUT RESET
switch on the front panel or, if the remote on/off feature is in use (see PAR. 3.5), open 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.
If the internal temperature of the HSF increases beyond allowable limits, 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.
3.7.2 OVERCURRENT SETTING AND PROTECTION
The output characteristic of the power supply is a square type, and the unit is set to produce an
alarm (see PAR. 3.8.2) and shut down if output current exceeds specifications (see Table 2) for
more than 30 seconds. After shut down, reset the unit per PAR. 3.6.
3.7.3 FAN FAILURE
A cutoff of the fan supply voltage or a decrease in fan speed causes the output to shut down and the
fans to turn OFF. Fan failure and all the other protection circuit operations produce an alarm (see
PAR. 3.8.2). After shut down, reset the unit per PAR. 3.6. If fan rotation is out of specification the
power supply will not recover.
3.7.4 UNDERVOLTAGE
M MODELS ONLY:
If power supply output voltage either falls below 80% of the programmed (set)
value, or if output voltage is programmed below the minimum values listed in Table 4, an alarm
occurs if the internal relay alarm (factory default, see PAR. 3.8.2.1) is enabled. To restart (reset)
the unit, press and release the OUTPUT RESET switch on the front panel or, if the remote on/off
feature is in use (see PAR. 3.5), 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. To enable the alarm function when operating
below the minimum values listed in Table 4, refer to PAR. 3.8.2.2 to configure the optically-cou-
pled alarm.
