Failures require investigation as to cause and/or repair of the unit.
THERE ARE NO USER SERVICEABLE PARTS INSIDE. HAZARDOUS VOLTAGES EXIST INSIDE THE UNIT. SERVICE AND
REPAIR MUST BE REFERRED TO QUALIFIED FACTORY PERSONNEL.
INSTALLER NOTES
The outputs are NOT referenced to the chassis. The Modular System can be used either positive or negative ground. Using the provided short jumper,
run the jumper from the FG terminal to the -V or +V terminal, as desired.
DO NOT
block any of the cooling vents on the sides and always allow adequate ventilation by not installing the unit inside tightly closed spaces.
Physical mounting position is not critical but the cooling vents and the thermostatically controlled cooling fan must not be blocked.
Make certain the input voltage switch on each module is set to the correct voltage BEFORE applying AC power to the module(s).
METER CIRCUITS for meter equipped units
The panel meter is switched to provide DC output voltage measurement and individual output load current measurement for each individual module.
When set to the VOLT position, the full scale reading is 15 volts.
When set to the AMP position, the full scale reading is 30 amps.
The meter and associated circuitry accuracy is 10 percent of full scale deflection. Since full scale is 30 amps, a 20 amp current load can vary from 4 to 6
amps per module. To prevent unnecessary output voltage drops, the meter circuits use the voltage drop of the parallel black #16 AWG negative return to
the module as a 50 mV shunt. The parallel #16 AWG wires provide a nominal 50 mV drop at 30 amps. The panel meter sensitivity is 50 mV for full
scale.
The 15K ohm resistor is used as the meter multiplier for voltage measurement. The meter sensitivity for voltage measurement is 1000 ohms per volt.
CONDUCTOR PRETREATMENT
All kinds of copper conductors can be clamped without treatment. DO NOT solder tin stranded conductors. The solder yields and fractures under high
pressure. The result is increased contact resistance and excessive temperature rise. Additionally, corrosion has been observed due to the fluxes.
Notch fractures at the transition from the rigid tinned part to the flexible conductors is also possible. Ferrules can be used as a protection when wiring
stranded conductors. Copper ferrules prevent the current transfer from being influenced by dissimilar metals and remove the risk of corrosion. Always
use the correct tool to crimp the ferrule.
Recommended Copper Wire Size for Current Capacity
(Insulated Wire, Single Conductor in free air)
Current Level in Amperes
<7 AMPERES
Wire Size
20 AWG Up to 5 feet
18 AWG Up to 10 feet
14 AMPERES
18 AWG Up to 5 feet
16 AWG Up to 10 feet
20 AMPERES
16 AWG Up to 5 feet
14 AWG Up to 10 feet
30 AMPERES
14 AWG Up to 5 feet
12 AWG Up to 10 feet
40 AMPERES
12 AWG Up to 5 feet
10 AWG Up to 10 feet
50 AMPERES
10 AWG Up to 5 feet
8 AWG Up to 10 feet
70 AMPERES
8 AWG Up to 5 feet
6 AWG Up to 10 feet
100 AMPERES
6 AWG Up to 5 feet
4 AWG Up to 10 feet
BATTERY BACK-UP INSTALLATIONS
DuraComm has a battery backup accessory, Model RMBC, for the RM-series of power supplies. The RMBC mounts directly to the rear panel of the
RM-series and provides auto-change to battery power. Model RMBC provides a trickle charge to the battery. Do NOT connect a lead-acid battery
directly across the 13.8 VDC output. This will over-charge the battery resulting out-gassing and loss of electrolyte and failure of the battery
