2 — INSTALLATION AND WIRING
Curtis Model 1226 – September 2019
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pg. 14
Driver Outputs
e 1226 controller supports output through 3 generic drivers. Drivers 1 and 3 are low side drivers
that provide PWM. Driver 2 can be congured as either a low side driver with PWM or a high side
driver without PWM. e following table describes the PWM modes you can assign to the drivers
(excepting Driver 2 when it is high side):
Table 12 Driver PWM Modes
Mode Description
Direct PWM The output voltage is not adjusted to account for uctuations in
battery voltage.
Voltage Compensated PWM The output voltage is adjusted to compensate for uctuations in
battery voltage. This mode maintains a near-constant average
voltage at the pin.
Use the Driver n Compensation parameter to dene a driver’s PWM mode. See page 51.
e following list describes considerations for the drivers:
• Driver 1 is a special purpose driver that provides a 2A current for electromagnetic braking.
• Driver 1 can also be assigned to the other supported functions only when the main contactor
is engaged.
• Drivers 2 and 3 can be assigned to any of the supported output functions.
• You use the Coil Drivers menu to assign functions to the generic drivers; see page 50.
• e Brake+ pin (J1-4) supplies power to Driver 1.
• e Coil Return pin (J3-10) supplies power to Drivers 2 and 3 and provides reverse
polarity protection.
• e Coil Return and Brake+ pins have a maximum current of 8A (maximum pin rating).
• You can use the Driver n Compensate parameter to congure the drivers to compensate
for dierences between the nominal and actual voltages.
• e drivers provide diagnostic faults for open and shorted coils.
• You can use the Outputs menu to monitor the outputs’ values; see page 58.
Note: For electromagnetic brake considerations, see page 21.
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