KEPCO HSF 600W Series (suffix M and MZ) Operator Manuals - Manual (Page 15)

HSF (M) 600W 022713
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MZ MODELS ONLY: If power supply output voltage falls below 80% of the programmed (set)
value, an alarm occurs. 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.
3.8 ALARM SETTINGS
3.8.1 VISUAL ALARM.
When the unit is connected in a parallel configuration, the front panel VDC ON/ALARM indicator
can be configured to light red if the respective power supply output voltage is lost or if the POWER
switch is set to OFF. This is enabled when DIP switch 1, position 8 set to ON. This can be useful
to indicate the loss of output voltage from one parallel-connected power supply that may not be
readily apparent. The visual alarm is normally disabled: DIP switch SW1, position 8 set to OFF
(factory default).
NOTE: On MZ models, the meter is powered by an independent internal power supply and will
most likely remain lit after a failure. Visual inspection of the front panel VDC ON/
ALARM indicator and/or monitoring of the alarm signals is required to detect a failure.
If the ALARM indicator is enabled to light red, the VDC ON/ALARM indicator must be
powered from the HSF output (see PAR. 3.4.3).
3.8.2 ALARM SIGNALS.
Either of two options are available for signalling alarms: isolated relay contacts (factory default,
PAR. 3.8.2.1) or logic level alarm signals ±PF (PAR. 3.8.2.2). The ±PF logic level alarm option
must be used if the power supply is intended to operate below the minimum voltages listed in
Table 4.
3.8.2.1 INTERNAL ISOLATED RELAY ALARM
The first option, the factory default setting, uses an isolated internal relay offering normally closed
(NC) and normally open (NO) contacts referenced to an isolated common (AL COM). These con-
tacts may be used to configure “close on failure” or “open on failure” alarm circuits. (Refer to the
Series RA 19-4C Manual for alarm configurations for multiple HSF power supplies.) Setting posi-
tions 5 and 6 of the DIP switches as shown in Figure 10A selects this option. The NC (pin 6 of the
rack adapter I/O connector) and NO (pin 7) signals are referenced to Alarm common (pin 14).
3.8.2.2 OPTICALLY-COUPLED LOGICAL ALARM
The second option uses optically-coupled logic level alarm signals, +PF (pin 5 of the rack adapter
I/O connector) and -PF (pin 13), provided directly from the Kepco RKW power supply that is the
heart of the HSF. This option is selected by setting positions 5 and 6 of the DIP switches as shown
in Figure 10B. Use this option if the M Model power supply will operate below the minimum volt-
ages specified in Table 4.