Control Of Dout; Pulse Width Modulated (Pwmout/Dout) - Danfoss PLUS+1 SC0XX-1 Series Technical Information

Technical Information
PLUS+1 SC0XX-1XX Controller Family
Outputs
Specifications
Description
Output voltage, energized state
Output voltage, off state
Output current range for a status bit to read
OK

Control of DOUT

DOUT Status Description
BIT 3 Over temperature/open load
BIT 6 Safety layer failure
BIT 7 Safety FET disabled by secondary
BIT 8 Hardware supply power out of range

Pulse Width Modulated (PWMOUT/DOUT)

© Danfoss | June 2016
Units Minimum
Vdc Vbatt-1.0
Vdc 0
A 0.22
Do not connect a digital output to battery+ (back drive) without a series diode.
For each digital output there are two switches in series. One switch is controlled and monitored by the
secondary controller, and one is controlled and monitored by the primary processor. The secondary
controller can monitor the condition of the redundant switch under its control with a digital voltage
feedback signal. Any output can be disconnected from its supply voltage at any time by the secondary
controller with this redundant switch. When the redundant switch is disabled it must remain disabled by
the kernel for 250 milliseconds before the secondary controller's application is allowed to re-enable the
redundant switch. When the redundant switch controlled by the secondary controller is enabled then the
digital outputs can be enabled/disabled as commanded by the primary processor. The primary processor
can monitor the condition of its switch with a digital voltage feedback signal.
All PLUS+1 ® module proportional outputs are Pulse Width Modulated (PWM). PWM frequency is software
adjustable using PLUS+1 ® 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. The signal line of PVG valves can be driven with an open loop
PWM. The PWM driving the control signal must be set to 0 at the same time as the digital output driving
the PVE power pin is set to 0.
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).
Refer to individual module data sheets for the maximum allowable output current for each PLUS+1
module.
Maximum Comment
Vbatt Over all load conditions.
0.1 At Rload=200 Ω
3
Recovery
1. The primary application must first command the output to the off-state.
2. The BTS chip temperature must return to its valid range.
3. The kernel then clears status bit 3.
1. The controller must be reset by performing a power cycle.
1. The Safety FET must be off for 250 ms.
2. The primary application must command the output to the off-state.
3. The secondary application can then re-enable the output.
1. The primary application must command ALL outputs to the off-state.
2. The supply voltage must return to its valid range.
3. The kernel then clears status bit 8.
L1415500 | BC00000235en-US0201 | 13