Driving A Unidirectional Proportional Valve; Driving A Pve Valve; Driving A 4-20 Ma Device - Danfoss PLUS+1 Technical Information

Technical Information
Driving a Unidirectional
Proportional Valve

Driving a PVE Valve

Driving a 4-20 mA Device

Output Configurations for PLUS+1® Controllers
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.
+Batt
Con guration
Ground
When driving a Danfoss PVE valve, it is recommended to use the PVE output configuration
(PinConfig = 6). Set the PWM frequency at 4000 Hz.
+Batt
Con guration
Ground
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.
520L0922 • Rev EA • Sep 2013
PWM Open
Loop Logic circuits
PWM Open
Loop Logic circuits
FET
Load
FET
2304
+Batt
FET
PVE
FET
2305
9