KEPCO RA 19-1U Operator Manual - Manual (Page 38)

2-22
RA 19-1U 020413
2.5 CURRENT MONITORING (-1URC AND -1URY MODELS ONLY)
Monitored Output Current (Amps) = Voltage drop across Rs (Volts) x Rs (Ohms), where voltage
drop across Rs (see Table 2-3) is measured across ± IMON pins (requires millivoltmeter, range
0 to 200mV). Accuracy of voltage drop across Rs (representing monitored output current) is
±10%; contact Kepco if greater accuracy is required. See Figure 2-16 for typical configuration.
I/O connector pins designated for use for current monitoring are as follows:
I/O Connector +IMON –IMON
Slot 1 PS1, PS2 Pin 15 Pin 3
Slot 2 PS1, PS2 Pin 13 Pin 2
Slot 3 PS3, PS4 Pin 15 Pin 3
Slot 4 PS3, PS4 Pin 13 Pin 2
CAUTION: There is no isolation between ±IMON, alarm circuit and d-c output. +IMON is
also the –V output of the HSF power supply. For -1URY models, +IMON may
also be used for –RC.
FIGURE 2-16. USING CURRENT MONITORING (TYPICAL), -1URC AND -1URY MODELS ONLY
TABLE 2-3. SENSE RESISTOR VALUES
SERIES 3.3V Model 5V Model 12V Model 15V Model 24V Model 28V Model 48V Model
HSF -1UR 50W 0.01 Ohm 0.01 Ohm 0.02 Ohm 0.03 Ohm 0.05 Ohm 0.05 Ohm 0.1 Ohm
HSF -1UR 100W 5 mOhm 5 mOhm 10 mOhm 20 mOhm 20 mOhm 30 mOhm 50 mOhm
HSF -1UR 150W 2.5 mOhm 2.5 mOhm 10 mOhm 10 mOhm 20 mOhm 20 mOhm 30 mOhm