Pre-charge and Midpoint Wiring
The SP PRO Powerchain DC pre-charge and midpoint wiring layout is shown in Figure 5.
The pre-charge wiring is wired as a bus arrangement and connected to the battery via a common
connection for all SP PROs. This will allow all SP PROs to be pre-charged together.
The Midpoint wiring need only be connected to the System Manager (L1). The System Manager carries
out the battery sense and midpoint readings for the system.
The pre-charge and midpoint wiring must be protected by suitable fuses or a three pole circuit breaker
rated at least 2A DC per SP PRO. For the system below (Fig. 5) the pre-charge circuit breaker rating is
18A or more.
Figure 5: DC pre-charge and midpoint schematic showing nine SP PROs
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