KEPCO RKW 1500W Series Operator Manual - Manual (Page 11)

228-1503 REV 4 060110
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5.3 FAN FAILURE
A cut off of the rotation supply voltage causes the output to shut down and the fans to turn OFF. Fan
failure and all the other protection circuit operations are indicated by an open circuit across the (±)
PF terminals. To restart (reset) the unit remove the AC input power, wait about 40 seconds, then
reconnect AC input power; or open the RC terminals and then reclose the terminals. If fan rotation
is out of specification the power supply will not recover
5.4 UNDERVOLTAGE
If the output voltage of the power supply falls below 80 percent of the programmed voltage the
power failure alarm will go to the high logic state. Sink current is 2ma maximum and collector
emitter voltage is 40 volts maximum. The ±P/F terminals are insulated from AC input terminals
and the DC output terminals. Insulation resistance between the ±P/F terminals and the output ter-
minals is the same as insulation resistance from output to ground of the power supply. Insulation
resistance between the AC input terminals and ±P/F terminals is the same as insulation resis-
tance from the input terminals to the output terminals of the power supply.
6. LOAD CONNECTION
6.1 CONNECTING THE LOAD USING LOCAL SENSING
To connect the load for local sensing, (the sensing links are installed at shipping) connect the +S
to +M terminals and –S to –M terminals. The load is connected across DC output (+) and (–) bus
bars (see Figure 8).
6.2 CONNECTING THE LOAD USING REMOTE SENSING
For remote sensing the load is connected as shown in Figure 8. Remote error sensing at the load
terminals compensates for a voltage drop in the connecting wires as indicated in Table 2. For
remote sensing, the sensing links must be removed from the +S to +M and -S to -M terminals.
NOTE: If oscillations set off the overvoltage protection, install one external electrolytic capacitor,
rated 470µF min. between the +M and +S terminals and one between the –M and –S terminals.
FIGURE 8. CORRECT AND INCORRECT METHODS OF LOAD CONNECTION
6.3 PARALLEL CONNECTION
RKW 1500W Power Supplies can be connected in parallel (with or without N+1 redundancy). Use
twisted or shielded wire for connection to RV and –S terminals. The impedance of the load wires
between each power supply and load should be the same.