KEPCO RKW 600W Series Operator Manual - Manual (Page 10)

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RKW 600W 060110
a mechanical switch or a high level logic signal, the RKW 600W output is cut OFF. When the RC
terminals are shorted, the output returns to within specifications. At low level logic, the maximum
source current is 1.6mA, at high logic level the maximum sink current is 1.0mA. The RC terminals
must remain shorted if remote ON-OFF is not used. The RC terminals are isolated from both the
AC input and DC output terminals. Remote ON-OFF offers the advantages of low inrush current
and no delay on restarts.
4. ALARM FUNCTIONS
4.1 OVERVOLTAGE AND OVERTEMPERATURE PROTECTION
When the output voltage or the internal temperature of the RKW 600W Power Supply increases
beyond the specified values (see Table 1), the output is cut OFF and the fan turns OFF. Overvolt-
age setting tracks output voltage up to maximum specified in Table 1. To restart (reset) the unit,
remove AC input power, wait about 40 seconds, then reconnect AC input power. The power sup-
ply can also be reset with no delay using the remote ON-OFF feature (see PAR. 3.3).
If the Power Supply shuts down due to an increase in internal temperature, the restart cycle
(Power ON) should not begin until the temperature returns to within specifications.
The alarm circuit is a diode transistor optical coupler. The transistor is normally conducting. When
the alarm activates, the transistor cuts off and the collector emitter circuit opens (see PAR. 4.4).
4.2 OVERCURRENT PROTECTION
The overcurrent setting has a square type characteristic, and the unit is set to shut down if output
current exceeds specifications (see Table 1) for more than 30 seconds. To restart (reset) the unit,
remove AC input power, wait about 40 seconds, then reconnect AC input power. The power supply
can also be reset with no delay using the remote ON-OFF feature (see PAR. 3.3).
4.3 FAN FAILURE
A decrease in fan speed causes the output to shut down and the fan to turn OFF. Fan failure is indi-
cated by an open circuit across the (±) PF terminals) (see PAR 4.1). To restart (reset) the unit
remove the AC input power, wait about 40 seconds, then reconnect AC input power. The power
supply can also be reset with no delay using the remote ON-OFF feature (see PAR. 3.3).
4.4 OPTICAL COUPLER OUTPUT ALARM CIRCUIT
When the output voltage falls to less than about 80 percent of programmed output voltage the
alarm is activated: a high logic level appears at the ±PF terminals (see Figures 6 and 7). The
default state of the alarm is logic low. The sink current is 50mA maximum, the maximum collector
to emitter saturation voltage is 0.40 Volts, and the collector to emitter voltage is 40 volts maxi-
mum. The PF terminals are isolated from the AC input and DC output terminals. Insulation resis-
tance between the PF terminals and the AC input terminals is the same as the insulation
resistance between the input and output. Insulation resistance between the PF terminals and the
output terminals is the same as the insulation resistance between the output and ground.
FIGURE 6. OUTPUT ALARM CIRCUIT, OPTICALLY ISOLATED