DC Load Control Mode Cabling
Connect the positive battery cable to the terminal marked BAT POS on the C40 PCB, and
the negative battery cable to the terminal marked BAT NEG when using the C40 a load
controller. Connect a cable between the PV POS/LOAD terminal on the C40 and the
positive terminal on the DC load. Connect a cable between the PV/NEG terminal on the
C40 to the negative terminal of the load.
The C40 is designed to work with both negative ground and ungrounded electrical systems.
The metal chassis of this charge/load controller must be grounded for either system by
connecting it with a copper wire to a grounding electrode such as a ground rod driven into
the earth. If a negative ground system is desired, connect the negative current carrying
conductor to the grounding system at one point in the system. Consult local electrical
codes for more information and any additional requirements.
Located on the right side of the C40’s circuit board are three jumpers. It is mandatory that
these jumpers be set correctly for the unit to operate to it’s maximum potential.
A jumper is a small, rectangular piece of plastic with two square
holes in it that fits over two pins as shown in the illustration at
left. A jumper contains an internal conductor that joins the two
pins, completing a circuit. When the jumper is removed, the
circuit is interrupted. Jumpers are often used for changing
configuration parameters. When a jumper is not connecting two
pins, it can be stored by slipping it over just one of the pins
instead of both. This will have no effect upon the configuration,
but will keep the jumper handy for future use.
The C40 is equipped with several of these jumpers. They control equalization, low voltage
reconnect, battery voltage, and operating modes. Each of these are discussed in the
appropriate section of this manual. The factory default settings are shown below:
Enables automatic or manual battery equalization in Charge Control mode, and automatic
or manual reconnect in the event of low voltage at the BAT POS terminal in Load Control
mode. When AUTO is enabled In Load Control mode, the unit will reconnect automatically
when voltage at the BAT POS terminal exceeds the LVR setting. Factory setting is
manual equalization and manual reconnect.
- This jumper determines the operating mode: PV Charge Control and
Diversion Control mode, or Load Control model. Factory setting is Charge Control mode.
- Press and hold to manually initiate or suspend battery equalization in
Charge Control mode. Press and release to reset following an error condition. Press and
release to reconnect following a low-voltage disconnect event. If voltage remains below the
LVD setting, the unit will disconnect after a 10-minute ‘grace’ period.
- This jumper determines the voltage of the system that the C40 will be working
with. Connect the two pins adjacent to the legend for the voltage of your system: 12, 24,
48. Factory setting is 48-volts. The maximum DC voltage allowed is 90VDC for a 48-volt
system, 50VDC for a 24-volt system, and 25VDC for a 12-volt system.
If the optional digital volt meter (DVM/C40 or C40R) is attached to the C40, be sure to set
the jumper on the back of it for the appropriate system voltage. The jumper for limiting
power consumption and dimming the DVM display is also located on the back of the DVM.
Grounding
Configuring the C40
Battery Voltage: 48 volts DC
Equalize/LVR: manual Equalization
Operating Mode: Charge Control
Automatic/Manual Battery Equalization (EQ) and Low Voltage Reconnect (LVR)
Operating Mode
Reset Switch
Voltage
11
Copyright Trace Engineering Co. Inc. Tel (360) 435-8826 Part Number 2680 Rev. C
5916 195 Street, NE Fax (360) 435-2229 November 4, 1998
Arlington, WA 98223 USA www.traceengineering.com Page
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