Danfoss PLUS+1 Series Manual

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MAKING MODERN LIVING POSSIBLE
Technical Information
Output Configurations for
PLUS+1® Controllers

Technical Information Output Configurations for PLUS+1® Controllers
520L0922 • Rev EA • Sep 2013
2
Table of Revisions
Date Page Changed Rev
17 Sep 2013 All New layout EA
11 Mar 2013 6 Single Pole Double Throw Switch drawing updated DA
17 Oct, 2008 Various Various content update and literature type changed from
Tech Note to Technical Information
CA
11 Oct, 2005 5 Changed sentence “Use digital...” B
13 Jul, 2005 1 PVG 120 photo updated A
Revisions
Revision History

Technical Information Output Configurations for PLUS+1® Controllers
520L0922 • Rev EA • Sep 2013
3
About This Manual This publication is intended to share circuits, products and other useful application information
not otherwise found in other Danfoss publications. It is written to inform and aid the reader in the
successful application of Danfoss products.
PLUS+1 Controllers
Configurable Outputs
Driving Different Types of Loads......................................................................................................................................... 4
Driving a Relay or ON/OFF Valve ......................................................................................................................................... 4
Driving an Incandescent Lamp............................................................................................................................................ 6
Driving a Bidirectional Proportional Valve...................................................................................................................... 7
Driving a Unidirectional Proportional Valve................................................................................................................... 9
Driving a PVE Valve................................................................................................................................................................... 9
Driving a 4-20 mA Device....................................................................................................................................................... 9
FMEA Considerations Open Ground Wire to Controller....................................................................................................................................... 10
Open Battery+ Wire to Controller..................................................................................................................................... 10
Open Ground Wire to Load................................................................................................................................................. 11
Contents

Technical Information Output Configurations for PLUS+1® Controllers
520L0922 • Rev EA • Sep 2013
4
PLUS+1 Controllers
Configurable Outputs
Driving Different Types of
Loads
Driving a Relay or ON/OFF
Valve
If you need to use a multi-function PWM output for ON/OFF loads, then set the configuration in
the application program to one of the digital output selections. This can be push/pull, sourcing, or
sinking. (PinConfig = 0, 1, or 2)
Sourcing and Sinking options are not available for all pins. Please refer to the API specification for the
particular hardware.
PLUS+1 controllers have configurable outputs that can be used to drive a variety of different loads.
Danfoss recommends the following ways for using the PLUS+1 outputs to drive different types of
loads.
Danfoss recommends using a digital output for ON/OFF loads, such as a relay or valve. This
encompasses outputs labeled as DOUT or DOUT/PVG Pwr. The recirculating diode across the relay coil
is optional. The internal diode will provide the same functionality. These outputs always provide a
high voltage (sourcing battery voltage) as the output when in the ON state.
Relay
Ground
+Batt
Logic
circuits
FET
Optional
2295

Technical Information Output Configurations for PLUS+1® Controllers
520L0922 • Rev EA • Sep 2013
5
Driving a Relay or ON/OFF
Valve (continued)
It is recommended to use the push/pull configuration for every situation where a load is exclusively
driven by the controller.
Sourcing configuration (PinConfig = 1 or 0)
2296
Relay
Optional
Ground
+Batt
Logic circuits
FET
Sourcing or
Push/Pull
Conguration
FET
Sinking configuration (PinConfig = 2 or 0)
2297
Relay
Optional
+Batt
+Batt
Logic circuits
FET
Sinking or
Push/Pull
Conguration
FET
In the Sinking configuration, with the load tied to +Batt there is the potential for up to 5 milliamps
leakage current through the output when it is in the OFF state.

Technical Information Output Configurations for PLUS+1® Controllers
520L0922 • Rev EA • Sep 2013
6
Use sourcing or sinking when there are other sources tied in parallel, such as a
jog switch.
Driving a Relay or ON/OFF
Valve (continued)
Driving an Incandescent
Lamp
Danfoss only recommends using a digital output for driving incandescent lamps. This encompasses
outputs labeled as DOUT or DOUT/PVG Pwr. These outputs always provide a high voltage (sourcing
battery voltage) as the output when in the ON state.
2298
Lamp
Ground
+Batt
Logic
circuits
FET
It is not recommended to use multi-function PWM outputs for driving incandescent lamps. There are
limitations when driving incandescent lamps from multi-function outputs. An incandescent lamp has
an “inrush” current. Inrush is a spike in current just as you turn the lamp on when the filament is cold.
Multi-function outputs have a hard current limit which will trip the output off if this limit is exceeded.
When driving an incandescent lamp this can happen even though the average current requirements
for the lamp are well within the output pin’s drive capability. Depending on the inrush current, it
cannot be guaranteed that the multi-fuction output will reliably drive an incandescent lamp. This has
sometimes been effectively addressed by setting the output to open loop PWM (PinConfig = 3) and
then ramping the PWM percentage from 0 to 100 percent, but this is not guaranteed to work for all
applications.
2395
Ground
+Batt
Logic circuits
FET
Sourcing
Conguration
FET
+Batt
Single Pole
Single Throw
Switch
2396
+Batt
Single Pole
Double Throw
Switch
Ground
+Batt
Logic circuits
FET
FET
Sourcing
Conguration

Technical Information Output Configurations for PLUS+1® Controllers
520L0922 • Rev EA • Sep 2013
7
Driving a Bidirectional
Proportional Valve
Option 1 – H bridge configuration for single coil
Certain output pin pairs may be set for the H bridge configuration. Please refer to the API
specification for the pinouts on a particular hardware. This is an open loop PWM configuration
(PinConfig = 7).
2299
Load
Ground
+Batt
Logic circuits
FET
H-bridge
Conguration
FET
Logic circuits
FET
FET
H-bridge
Conguration
Option 2 – closed loop current controlled configuration for single coil
You may also use two outputs configured for closed loop current control to drive a bi-directional
valve. Certain output pin pairs may be used for this configuration (PinConfig = 8). Set the current
command to the desired milliamps. Please refer to the API specification for the pinout pairs available
on a particular hardware.
2300
Load
Ground
+Batt
Logic circuits
FET
FET
Logic circuits
FET
FET
PWM Closed
Loop Current
Conguration
PWM Closed
Loop Current
Conguration

Technical Information Output Configurations for PLUS+1® Controllers
520L0922 • Rev EA • Sep 2013
8
Option 3 – push/pull configuration for dual coil
You may also use two outputs to drive a bidirectional dual coil valve such as a dual coil EDC when
wired as shown below. This configuration will allow you to check the resistance of the coils for more
accurate diagnostics. Setting PinConfig = 4 on both outputs will give closed loop current control.
Refererence FMEA Considerations, pages 10 and 11.
2302
Coil A
Coil B
Ground
+Batt
Logic circuits
FET
FET
Logic circuits
FET
FET
PWM Closed
Loop Current
Conguration
PWM Closed
Loop Current
Conguration
Driving a Bidirectional
Proportional Valve
(continued)
2303
Coil A
Coil B
Ground
+Batt
Logic circuits
FET
FET
Logic circuits
FET
FET
PWM Closed
Loop Current
Conguration
PWM Closed
Loop Current
Conguration

Technical Information Output Configurations for PLUS+1® Controllers
520L0922 • Rev EA • Sep 2013
9
Driving a Unidirectional
Proportional Valve
It is recommended to use PWM configuration for unidirectional proportional valves. This may be set
for open loop PWM (PinConfig = 3) or closed loop current control (PinConfig = 4 or 5). Recirculating
diodes across the load should never be used if the valve requires closed loop current control. They are
optional for open loop PWM control.
Refererence FMEA Considerations, pages 10 and 11.
2304
Load
Ground
+Batt
Logic circuits
FET
PWM Open
Loop
Conguration
FET
Driving a PVE Valve When driving a Danfoss PVE valve, it is recommended to use the PVE output configuration
(PinConfig = 6). Set the PWM frequency at 4000 Hz.
2305
PVE
+Batt
Ground
+Batt
Logic circuits
FET
PWM Open
Loop
Conguration
FET
Driving a 4-20 mA Device Driving a 4-20 mA device is not recommended. The minimum controllable current is presently about
10 mA in the closed loop push/pull configuration.

Technical Information Output Configurations for PLUS+1® Controllers
520L0922 • Rev EA • Sep 2013
10
FMEA Considerations One consideration during a system FMEA (Failure Mode Effects Analysis) on an application is the
possibility of an open wiring connection. Here are three examples.
Effects of an Open Ground
Losing the ground connection can cause the battery current to find another path to ground if it is
available. When the load is grounded externally, rather than through the controller, such a path is
available. Current will find its way through the load even when the output is in the OFF state. This may
result in unintentional movement of the function that is controlled by the load.
Below is a simple schematic to show how this can happen. The arrows indicate the path of current.
2306
Load
Ground
+Batt
Logic circuits
FET
Conguration
FET
Open
The only way to remove the current completely is to return the load current back to the controller,
through another output. If you are driving an EDC type load (dual coil) and are driving both coils to
get a forward / reverse type function, this could be done by driving one coil bi-directionally with no
additional outputs consumed.
If there are enough valves connected to the controller to provide multiple current paths, you might
be able to reduce the amount of current in each valve enough so that it is no longer above the
threshold of any one valve.
If you have multiple ground connections to the controller, you might be able to reduce the
occurrence of the fault enough so that it no longer a significant risk (rates below 100 on the System
FMEA.) You may also be able to improve the wiring integrity to minimize the occurrence of the fault.
Open Battery+ Wire to
Controller
Open Battery+ Wire
Losing the Battery + connection can cause the battery current to find another path to ground if it is
available. When the load is tied to Battery+ externally, rather than through the controller, such a path
is available. Current will find its way through the load even if the output is in the OFF state. This may
result in unintentional movement of the function that is controlled by the load.
Open Ground Wire to
Controller