Curtis 1356, Manual, Page: 6 / 58

2 Curtis 1356/1356P CAN Expansion Module Manual,
Rev. A
3 Analog inputs are selectable for resistive sensors (0–5 k
Ω
)
3 1 quadrature encoder input
3 Serial port for Curtis programmer or fault code display
3 CANopen communication port controlled by dynamic mapping
3 Regulated 5V and unregulated 12V current-limited power supplies
3 The output voltage and current of the 5V and 12V supplies can be monitored
3 Software and hardware watchdog circuits ensure proper software operation
3 IP65-rated protection for 1356P (exclusive of connectors)
3 Red and yellow status LEDs provide external monitoring.
DESCRIPTIONS OF KEY FEATURES
Active-High Digital Inputs
The 1356 /1356P has eleven digital inputs. Each input is digitally filtered to
eliminate switch “bounce” or noise in the signal. A power resistor pull-down
to B- at each input provides active high to B+.
High Frequency Driver Outputs
The 1356 /1356P contains two driver outputs. One can sink up to 1 amp
through an inductive or a resistive load; the other can sink up to 3 amps through
an inductive or a resistive load. Internal flyback diodes to B+ prevent voltage
spikes. High frequency PWM (16 kHz) provides smooth current to the load.
Constant Current or Voltage Outputs
The two driver outputs can work in Constant Current mode or in Constant
Voltage mode.
In Constant Current mode, the software runs a closed loop PI controller
to provide an average constant current. This current is commanded over PDO
as a 0–100% command based on the maximum current setting (set through a
Curtis programmer or an SDO).
Each output can also be programmed for Constant Voltage mode. In this
mode, the battery voltage is monitored and the PWM command is corrected
by a feed-forward controller to provide a constant average voltage commanded
over the PDO (a 0–100% command based on the maximum voltage setting).
In addition, each output can also be programmed to provide a directly
commanded PWM% output (Direct PWM mode) or shut off to be used as
an input (Active-High Digital Input Only mode).
Programmable Dither for Hydraulic Valves
Dither is a small variation in the command that keeps the seals of a proportional
valve oiled. This lubrication allows the valve to move freely for accurate PV
control. Dither is only active on drivers in Constant Current mode.
1 — OVERVIEW