Crimp terminal
39-00-0073
Wire gauge range
AWG18-24 stranded
This interface is used to drive up to four (4) external contactor coils and to select their power
source. The negative operating power is provided in a fused connection to this connector.
Connecting to Contactor Coils
The Battery Controller provides coil drivers for contactor coils up to 24V DC. The Battery
Controller’s internal 24V power supply may be used to power the coils if the following conditions
are satisfied:
• 24V coils are connected
• The worst-case coil inrush current is below 1.5A
• The sum of all connected coil currents is less than 1A
To use the internal power supply, connect together pins 11 (
+VCOIL
) and 12 (
+24V
) of J6 to deliver
+24V to the
+VCOIL
input. Pin 5 (
VCOIL_RETURN
) is left disconnected and should be insulated to prevent
shorts.
Other coil voltages in the 12V-24V range and total currents of up to 1.5A/coil may be supported
through the use of an external DC power source. Such a supply must be connected between
+VCOIL
(pin 11) and
VCOIL_RETURN
(pin 5) of J6.
As depicted in
Connection example for powering the Battery Controller from external DC power
source
, if an external power supply is used to power the Battery Controller instead of the battery
stack, the
VCOIL_RETURN
(pin 5) connection of
J6
must be externally connected to the bottom of the
battery stack. If using a dedicated external power supply to power the contactor coils, connect the
common return of that supply to this pin.
Coil back-EMF protection is provided by the Battery Controller that clamps at 40V. External
clamping diodes of lower voltages may be connected if required.
The bottom of the attached battery stack is internally connected to the common
return path for all contactor coils (pins 1~5 of
J6
). It is recommended that no
ground connection be made at the coils to avoid creating an inadvertent ground
fault or ground loop.
Contactor coils are to be connected between the
COILn_HI
and COM pins of J6 as required. When
the Battery Controller activates a contactor, the
COILn_HI
output is driven to a
VCOIL
voltage level.
Unused contactor coil wires should be properly insulated or removed. Refer to
Connection example
for powering the Battery Controller from cells
and
Connection example for powering the Battery
Controller from external DC power source
for use of the
–
VPOWER
connection at
J6
.
Contactor coils, internal and external supply connections to
J6
are shown in
Connection to J6: Two
24V contactor coils powered from internal supply
and
Connection to J6: Four contactor coils
powered from external supply
.
Installation Guide - 2018-10-08, Rev. 2.0
11
