© 2016 Sensata Technologies
12
Installation
conduit, so the fuse
must be installed
in the ungrounded conductor (usually
the positive DC cable line)
within 18 inches (45.7 cm) of the battery—to
protect the DC wiring system.
If using a fuse, we recommend using a
class-T type or equivalent. This fuse
type is rated for DC operation, can
handle the high short-circuit currents,
and
allows for momentary current surges from the inverter without opening.
2.4.2 DC
Grounding
The inverter should always be connected to a permanent, grounded wiring
system.
The idea is to connect the metallic chassis of the various enclosures
together to have them at the same voltage potential, which reduces the
possibility for electric shock.
For the majority of installations, the inverter
chassis and the negative battery conductor are connected to the system’s
ground bond via a safety-grounding conductor (bare wire or green insulated
wire) at only one point in the system. Per the NEC, the size for the grounding
conductor is usually based on the size of the overcurrent device used in the
DC system.
Refer to Table 1
to select the appropriate DC ground wire based
on the overcurrent device used for your inverter model.
If using this inverter in a vehicle, DO NOT connect the battery negative (–)
cable to the vehicle’s safety ground. Connect it only to the inverter’s negative
battery terminal. If there are any non-factory installed DC appliances on board
the vehicle, DO NOT ground them at the safety ground. Ground them only at
the negative bus of the DC load center (as applicable).
2.4.3 DC Cable Connections
When connecting the DC cable to the battery or to the inverter’s DC terminals,
the hardware should be installed in the correct order to prevent high resistance
connections which will heat up and could cause the connections to melt. Use
Figures 2-5 and 2-6 as a guide to stack the hardware correctly. Tighten the
terminal connections from 10 to 12 foot-pounds (13.6 to 16.3 N-m).
CAUTION:
Do not put anything between the DC cable ring lug and
the battery terminal post or the inverter’s DC terminal. If antioxidant
grease or spray is used, apply it once all the connections have been
made and are properly tightened.
CAUTION:
Overtightening or misthreading nuts on the DC terminals
will cause the bolts to strip and snap/break-off.
BATTERY
DC cable
with ring lug
bolt
flat washer
nut
lock washer
battery
post
battery terminal
Battery Temperature Sensor
(charger models)
Verify the DC cable lugs are
flush with battery terminals.
Torque the battery terminals
from 10 to 12 ft-lbs.
Figure 2-5, DC Cable to Battery Terminals
