Which products are affected?
8200vector 0.25 - 90 kW (≤ SW 3.1) with standard I/O or application I/O (≤ SW 3.1)
8200motec 0.25 - 7.5 kW (≤ SW 3.1) with standard I/O or application I/O (≤ SW 3.1)
What happens?
Because of tolerances, the wire-breakage monitoring of the setpoint input for the master current (4 to 20 mA) still triggers an SD5 trip (wire breakage) at master current values of ≥ 4 mA.
When does the problem occur?
The function restriction occurs, when the master current value drops into the range of tolerance of the wire-breakage monitoring. Then, an SD5 trip may be triggered before dropping below the master current value of 4 mA.
Possible diagnostics?
With a DC meter, the master current value at which the SD5 trip is triggered can be determined at the analog input.
Short-term measures/recommendations?
Fixed resistance of approx. 22 kΩ (0.25 W) between terminal 9 and 8 (application I/O = I1 or I2)
Evaluation
The problem occurs during set-up. Selecting a master current of up to 0 % (= 4 mA) is impossible since the wire-breakage monitoring is already triggered at a lower level (< 4.3 mA).
