Danfoss PLUS+1 DP570 Series, Техническая информация

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4–20 mA input (continued)
Description Unit Minimum Maximum Comment
Worst case error mA 1.7 Over the full temperature
range -30º C to +60º C (-22º F
to +140º F
Input impedance Ω 100.76 ± 2 —
Maximum over-current voltage V 5.43 —
W
Warning
Using these inputs can affect the accuracy of any Safety Critical closed loop control. These displays do not
have a Real Time Operating System (RTOS). Do not use these displays as the master control for any type
of safety critical control, or closed loop control system. Frequency inputs are managed by the operating
system. Accuracy can be affected by processor load. These displays should only be used for non-safety
critical related functions.
Encoder
The encoder input is only suitable for user interface functions, such as, navigating in menus and adjusting
values because there is no guarantee that all pulses are detected and the detected direction can be false.
The rate of pulses should be kept at a few tens per second to minimize the loss of detected position
changes.
The encoder function samples the A and B signals from the encoder and increments or decrements the
counter according to the phase sequence. The counter is incremented/decremented on every low to
high and high to low edge of the A signal. Some encoders with detents give a complete pulse between
detents and the counter will be incremented/decremented by two for every detent. The counter is
incremented when the A signal is the leading phase and decremented in the opposite case.
Video
There is one video input, which can accept either NTSC or PAL video signals.
Outputs
Video power output
Description Unit Minimum Maximum Typical Comment
12V V 11.58 12.42 12 —
Video camera power current mA 0 400 — —
Short circuit protection V — 36 — —
To power the camera up, it is recommended to use the display as power supply. If using a different power
supply, it should meet the specification of the camera in regards of the voltage type and range, the
current and voltage amount it can supply to its load, stability of the output voltage and current under
varying line and load conditions, operating/storage temperature ranges.
The use of a different power supply for the camera can create “noise” on the signal line which will affect
its functionality.
Technical Information
DP570 Series Displays
Inputs/outputs
14 | © Danfoss | January 2017 L1328765 | BC00000231en-US0701