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Model 91-30 Owners Manual
91-30 DC to DC Converter Owner’s Manual
4
Operation
Normal Operation:
Model 91-30 DC to DC Converter will provide up to 30 amps continuous output and
maintain 24 volts output voltage across the full range of DC input voltage. No minimum load is required.
No output condition:
DC input voltage must be above 11 volts for the unit to “turn ON” and must remain
above 11 volts during operation.
Overload Condition:
An overload condition exists when the 24 volt load exceeds the 91-30 output rating of
30 amps. The symptoms that indicate an overload condition exists are output voltage below 24vdc combined
with 30 amps output current. The overload condition will not damage the DC to DC Converter. During the
overload, internal protection circuits reduce output voltage as needed to limit the output current to 30 amps.
Parallel Operation:
Multiple Model 91-30 DC to DC Converters can be operated in parallel.
Installation Recommendations
Caution:
This equipment employs components that tend to produce arcs and sparks. To prevent fire or
explosion, do not install in compartments containing batteries or flammable materials. Safety goggles should
always be worn when working near batteries
Terminal Connections:
When connecting wires or cables to the electrical terminals (+24, GND, +12), do not
exceed the specified torque of 120 in-lbs. Torque values higher than specified may damage the product,
reducing performance or creating hazardous conditions.
Do not connect more than one conductor per terminal. Multiple wires and cables may overstress internal
components, resulting in poor performance or creating hazardous conditions.
Fusing:
A fault protection device must be installed between the DC to DC Converter and the power source
(battery). A fault protection device would be any fuse or circuit breaker properly rated for the maximum DC
input current. This advisory is in accordance with SAE, NEC and UL, for mobile power applications.
Minimum Wire and Fuse Sizes:
Connect Model 91-30 to the 12vdc source using #6AWG or larger cable,
and protected by a 100 amp fuse or circuit breaker. Use the same size cable for the 12v, 24v and GND
circuits. Install adequate fuse protection if smaller cables are used for the 24v and GND.
Wire Temperature rating:
Since the DC to DC Converter can be operated in temperatures up to 90ºC , use
wire rated at least 105ºC.
Mounting Location:
The DC to DC Converter may be mounted in any orientation, however, the
recommended orientation for optimum heat dissipation is wall mounted with fins vertical. It is recommended
that the wiring terminals be down to prevent the possibility of a falling metal object shorting the terminals. Do
not mount in zero-clearance compartment that may result in the DC to DC Converter overheating.
Environmental Protection:
Do not expose to rain or moisture. The unit should be located in an area that will
protect it from direct exposure to moisture such as high pressure washing, rain, etc.
