HIMA HIMatrix F3 AIO 8/4 01 User Manual

F3 AIO 8/4 01 3 Product Description
HI 800 161 E Rev. 1.01 Page 15 of 54
2. Short-circuit:
An short-circuit within the actuator circuitry (including the actuator) results in a high voltage
drop (≤ output voltage of DO) through the shunt, which causes the short-circuit to be
detected (maximum resolution of AI, see
Table 7). The overvoltage protection of the analog
inputs is activated at approximately 15 V.
A protective circuit consisting of a Z-diode and series resistor must be implemented to
avoid an overload of the internal overvoltage protection.
NOTE
To protect the input multiplexer of the analog inputs from overload, a protective
circuit consisting of Z-diode and a series resistor must be connected within the input
circuit in parallel to the existing shunt
The configuration of the Z-diode with series resistor depends on the overvoltage protection
threshold and must be set up to ensure that the HIMatrix overvoltage protection is not
activated if a short-circuit occurs.
Configuration example for short-circuits:
Shunt: R
shunt
10 Ω
Solenoid valve resistance: R
solenoid valve
75 
Maximum output voltage of the digital output DO U
ma
x 26.8 V
Table 8: Example of Short-Circuit
 Z-diode with switching voltage of 12 V
 Analog input with operating range of 0...10 V
 Overvoltage protection in the HIMatrix with input voltage > 15 V
Normal operation (no short-circuit):
U
max
= U
solenoid valve
+ U
shunt
= 26.8 V = 23.65 V + 3.15 V
The voltage U
shunt
is also present on the protective circuit consisting of Z-diode and series
resistor.
The Z-diode does not switch on at 3.15 V, i.e., the voltage drop of 3.15 V on the shunt is
present on the analog input.
Short-circuit:
U
max
= U
solenoid valve
+ U
shunt
= 26.8 V = 0 V + 26.8 V
If a short-circuit occurs in the external circuit (actuator or line), the voltage from DO is
dropped completely at the shunt.
The switching threshold of the overvoltage protection of AI is approximately 15 V.
The Z-diode should become conductive at 12 V such that no more than 12 V is present on
AI and the entire scaling range of AI is available.
The maximum voltage drop U
diode
on the series resistor R
diode
of the Z-diode results from:
U
diode
= 26.8 V – 12 V = 14.8 V

HIMA HIMatrix F3 AIO 8/4 01 Specifications

General

Brand	HIMA
Model	HIMatrix F3 AIO 8/4 01
Category	Controller
Language	English