1 — OVERVIEW
Curtis 1353 CANopen Expansion Module Manual – June 2017 Return to TOC
pg. 2
• 2 quadrature encoder inputs.
• 5V and 12V current limited power supplies.
• Optional serial port, for Curtis programmer or display.
• CANopen communication port controlled by two xed PDO maps and programmable over
SDOs.
• CAN Node ID selectable through digital inputs or virtual digital inputs.
• Soware and hardware watchdog circuits ensure proper soware operation.
• IP65-rated enclosure allows the 1353 to be mounted in multiple orientations, and protects
it even in harsh environments.
• Status LEDs provide external monitoring.
DESCRIPTIONS OF KEY FEATURES
High Frequency Driver Outputs
e 1353 contains nine identical output drivers. ese drivers can sink up to 3amps each through an
inductive load, with the total current limited to 18 A. Internal yback diodes to B+ prevent voltage
spikes. High frequency PWM (16 kHz) provides smooth current to the load.
Constant Current or Voltage Outputs
In Constant Current mode, the soware 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 and minimum current settings with ramping features (set through SDO or a
Curtis programmer).
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 o to be used as an input (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. is
lubrication allows the valve to move freely for accurate PV control. Dither is only active on drivers
in Constant Current mode.
Min/Max Current
Max Current parameter sets the maximum allowed driver current through the load when driver
command is 100%.
Most proportional valves need a non-zero closed current in order to start opening immediately.
Min Current parameter sets the minimum driver current through the load when driver start (driver
command > 0).
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