Pulse Width Modulated (Pwmout/Dout/Pvgout) - Danfoss PLUS+1 Series Technical Information

Technical Information
Inputs/Outputs Types and Specifications
PLUS+1® Controller Family
General (continued)
Description
Type
Short circuit to ground protection
Open circuit detection
Parallel operation
Shut off
Specifications
Description
Allowed voltage at pin
Output voltage, energized state
Output voltage, off state
Output current range for status bit
to read OK
W
Warning
Unintended movement of the machine or mechanism may cause injury to the technician or bystanders.
DOUT and HDOUT digital outputs do not have an internal feedback to the PLUS+1 module kernel. To
protect against unintended movement, if the application requires fault detection, an external feedback
using an AIN configured pin must be used. External feedback is required if the actual output is to be read
by the PLUS+1 Service Tool.
All other output types have internal feedback to the PLUS+1 module kernel that provide pin fault and
status information that can be read directly by the application and the PLUS+1 Service Tool.

Pulse Width Modulated (PWMOUT/DOUT/PVGOUT)

All PLUS+1 Module proportional outputs are Pulse Width Modulated (PWM). PWM frequency is software
adjustable using GUIDE. A low frequency dither may also be added with software to some outputs (see
individual module API specifications for PWM outputs that support dither). There are two modes of PWM
operation: open loop and closed loop (current control).
In open loop mode, current can be sourced or sunk (all modules are limited to 8 amps sinking), but the
output is a PWM duty cycle. Current feedback may be monitored in open loop mode, but the output is a
constant voltage, not a constant current. PVG valves may be driven with open loop PWM.
In closed loop mode, current is sourced and a constant current is maintained by the module's operating
system using internal current feedback. Load impedance must not exceed 65 ohms.
In closed loop mode, the maximum current is limited by measuring the feedback current. There is no
thermal protection. If the maximum current is exceeded, the controller kernel will shut down the output
and latch it. The kernel also limits how quickly the output can be repowered (250 ms). The output cannot
be reset until the command goes to 0 or False (if configured as a digital output).
Proportional outputs that are used as a digital sinking output have a potential for a leakage current of up
to 5 mA when off.
520L0719 • Rev PB • Feb 2014
Comment
Linear switching.
Non-damage, current/thermal limit with status indication;
automatic latch off/resume.
Status indication provided. The GUIDE pin status requires a load
of 1000 mA to be connected or an open status will be declared.
Digital outputs from the same module are capable of being
connected together such that the net current rating is the sum of
the individual ratings: timing is resolved by the operating system
and diagnostic capability is maintained.
Processor control with hardware Watchdog override.
Units Minimum Maximum
Vdc 0 36
Vdc Vbatt-1.0 Vbatt
Vdc 0 0.1
A 1 6
Comment
See caution statement below.
Over all load conditions.
At Rload=200 Ω
See pair comment above.
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