Specifications

Curtis 1310 Manual, Rev. B
15
1 6 F E B R U A R Y 2 0 0 8 D R A F T
Digital outputs
These signal lines can be used as digital (on/off ) or Pulse Width Modulated
(PWM) outputs. Each driver is active low, meaning the output will pull low
(to B-) when commanded On. The PWM is at a fixed frequency (
∼ 9.7kHz for
Outputs 1–4 and
∼ 400Hz for Outputs 5–16), but can vary duty cycle from
0% (Off = 0) to 100% (On = 32767). Digital Outputs 1 and 2 are special as
these have internal current feedback signals that can be used by VCL to create
current sources or check the output load, etc.
If the digital outputs are connected to inductive loads, the B+ tab must be
connected to the battery source. This connection provides a path for the internal
freewheel diodes to clamp the turn-off spike. Failure to make this connection
with inductive loads can cause permanent damage to the controller as well as
propagate failures of other electronics in the system due to the high voltage
spike caused when an inductive load turns off without a freewheel path.
2 — INSTALLATION & WIRING: I/O Signal Specifications
DIGITAL OUTPUT SPECIFICATIONS
OUTPUT PROTECTED ESD
SIGNAL NAME PIN PWM FREQUENCY
CURRENT VOLTAGE TOLERANCE
Input/Output 1–16 J1-1 0 to 100% Outputs 1–4: Sink 3 amps 24–48V models: ± 8 kV
thru duty cycle
∼ 9.7 kHz -0.5 to 64 V (air discharge)
J1-16 Outputs 5–16: 48–96V models:
∼ 400 Hz -0.5 to 124 V
Analog inputs
The four analog inputs can easily be configured for use with potentiometers.
VCL allows each input to be independently set up as a voltage input or as a
2-wire or 3-wire resistance input. Voltage inputs can be connected directly to
the Wiper input (with B- or GND for the return line). Rheostats (2-wire) are
connected between the Pot Wiper and Pot Low, and a 3-wire potentiometer has
the resistance element connected between the Pot High and Pot Low signals
and the wiper connected to the Wiper signal. The corresponding VCL setup
must be used to allow the 1310 to properly detect and scale the signal.
Although designed to be used with potentiometers, Pot High and Pot Low
signals are monitored by analog pins in the 1310 and thus have a limited use
as analog inputs. Note that these pins have a low input impedance (~ 680
Ω)
which could be damaged by moderate voltages from a low impedance source.
ANALOG INPUT SPECIFICATIONS
OPERATING
INPUT PROTECTED ESD
SIGNAL NAME PIN VOLTAGE
IMPEDANCE VOLTAGE TOLERANCE
Wiper 1–4 J4–6 thru J4-9 0 to 5 V 5 kΩ - 1 V to 30 V ± 8 kV
(air discharge)
Pot High J4-5 0 to 5 V 680
Ω to +5 V - 1 V to 30 V ± 8 kV
(air discharge)
Pot Low J4-10 0 to 5 V 680
Ω to ground - 1 V to 8 V ± 8 kV
(air discharge)
☞