Curtis 1212S Manual,
Rev. B
9
Circuitry Protection Devices
To protect the control wiring from accidental shorts, a low current fuse (ap-
propriately sized for the maximum control circuit current draw) should be
connected in series with the B+ logic supply. A fuse is also recommended in
the high power circuit from the battery to the controller’s B+ terminal. This
fuse will protect the power system from external shorts and should be sized
appropriately for the maximum rated current of the controller.
Charge Inhibit
Typically, battery chargers have a dedicated third terminal that automatically
provides inhibit. Inhibit is provided through J2 Pin 3; see wiring diagram, page 6.
When J2 Pin 3 (charge inhibit input) is pulled low, the controller disables the
drive functions and engages the EM brake while the charger is connected. The
charger inhibit automatically powers up the controller without the keyswitch
on so that BDI can be tracked during charge. After BDI is 100% reset, power
is totally shut off (no current used) to avoid draining the battery.
Status LED
The 1212S controller has an internal Status LED, which can be used to tell the
operator, at a glance, the controller’s status. This LED always indicates whether
the controller is powered on or off. It will also provide diagnostics information
via flash codes (see Section 7).
Lift Lockout / Pump SRO
When the External Lift Lockout parameter is programmed on (see page 19),
the 1212S will take the external lift lockout signal from a Curtis 906 meter
to control the lift lockout driver when lift lockout is triggered, and the driver
will be activated when the input signal is low. The maximum current for this
low-side driver is 1.5 A.
The Pump SRO safety feature can be used to check the status of the pump
switch wired to B+. When the Lift Lockout Enable parameter (see page 19) is
programmed on, if the switch is closed before KSI is turned on, the 1212S will
report a Pump SRO fault and will disable the Lift Lockout Output.
2 — INSTALLATION & WIRING:
Switches, etc.
