2 — INSTALLATION AND WIRING
Curtis 1353 CANopen Expansion Module Manual – June 2017 Return to TOC
pg. 12
Each driver is monitored and will detect a short in the load, a failed internal driver FET, and/or an
open in the load wiring. At near 0% and 100% PWM, it is not possible to discern each fault and some
faults will not be detected.
If the driver outputs are connected to inductive loads, the coil should have a return line to the B+ pin
of the 1353. is connection provides a path for the internal freewheel diodes to clamp the turn-o
spike. Failure to make this connection with inductive loads can cause permanent damage to the 1353
as well as propagate failures of other electronics in the system due to the high voltage spike caused
when an inductive load turns o without a freewheel path.
Digital Inputs
e nine digital I/O lines can also be used as digital (on/o) inputs. Normal “on” connection is direct
to B+; “o” is direct to B-. Input will pull low (o) if no connection is made.
DIGITAL INPUT SPECFICATIONS
Signal Name Pin Logic Threshold Input Impedance
Input/Output 9 15
All models:
Low = 1.6V
High = 4.0V
12 – 36 V models:
about 10 kΩ
36 – 80 V models:
about 47 kΩ
Input/Output 8 16
Input/Output 7 17
Input/Output 6 18
Input/Output 5 19
Input/Output 4 20
Input/Output 3 21
Input/Output 2 22
Input/Output 1 23
Because these nine lines can also be used as driver outputs, it is important to ensure that Operation
Mode is set appropriately for each line. For each pin that will be used as a digital input, Operation
Mode must be set to Input Only (see page 31). Otherwise, a direct short from the battery through
the internal driver FET will occur when the input is switched high and the FET is turned on.
81
2316
9 15
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