2 — INSTALLATION AND WIRING
Curtis 1239E-1269E Manual, os 37.0 RevA – May 2021
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pg. 16
Digital and PWM Outputs
Seven digital (on/o ) and PWM output drivers are available. One of these, the proportional driver,
can be operated in a current control mode for driving a proportional valve or similar load. e
frequency of this driver is normally 18 kHz, but this output can also serve to drive an electronic
speedometer or tachometer using the VCL function Automate_Frequency_Output().
e PWM drivers can be independently turned on continuously (low level) or pulse width modulated
to set the average output voltage. These outputs are intended to drive inductive loads such as
contactors and electromagnetic brakes but could also be used to drive resistive loads if peak current
ratings are not exceeded.
All these outputs are protected against shorts to KSI or low power ground. All high power inductive
loads should be connected to the coil return (pin 13), which provides yback diode protection.
ese lines can also be used as digital inputs, and are included in that group as well.
DIGITAL and PWM OUTPUT SPECIFICATIONS
Name Pin PWM PV Current Frequency
Output
Current
Protected
Voltage
ESD
Tolerance
Driver 1 6
0 to 100%
Duty Cycle
N/A
120 to 1000
Hz *
2A Max
–0.5V to 20V
± 8 kV
(direct
strike)
Driver 2 5 3A Max
Driver 3 4
2A Max
Driver 4 3
Prop Driver 2
0 to 2A in
607 nominal
steps
18 kHz
Digital Out 6 19
On / Off N/A N/A 1A Max
Digital Out 7 20
*Drivers 1–4 Frequency is set by the PWM Frequency parameter.
Primary
µP
SWITCH INPUTS
1-8, 16
(pins 8-12, 22,
24, 33, 14)
*
1239E/1269E (12V KSI) = 7.5 kΩ
150 kΩ
150 kΩ
5V clamp
DRIVER INPUTS
(pins 6, 5, 4, 3, 2)
100 kΩ
100 kΩ
µP
5V clamp
DIGOUT INPUTS
(pins 19, 20)
Supervisor
µP
150 kΩ
191 kΩ
3.3V clamp
Model
specific
*
DIGITAL INPUT IMPEDANCE CIRCUITS
13
24
1
23
35
12
Quick Link:
Figures 5 & 6 wiring
diagram p.12-13
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