Chapter 7 Operation
26
Operating manual HE 5422 MR
Version 1.2
B
Current output 4…20 mA
The current output is galvanically isolated.
C
Operating or error signal relay.
During error-free operation, the NO contact is closed. If a fault has
occurred, the NO contact is opened and the NC contact is closed.
The following causes will lead to an error message:
1. Power failure (Fail-Safe-Operation)
2. Device failure (parameter error)
3. Δp-Sensor fault / measuring range exceedance
D
Cleaning relay.
The cleaning relay is closed when
1. The "Upper threshold" is exceeded or the "Lower threshold" is fallen
below of
2. The "Post cleaning threshold" is fallen below of for the post cleaning
time, if the "lower threshold" was exceeded previously
3. The start input is closed
4. There is a trigger signal on the post cleaning input for the post cleaning
time
E
Δp high alarm relay
The relay is closed when exceeding the Δp high alarm threshold.
An activation delay can be parametrized.
F
Δp low alarm relay
The relay is closed when the Δp low alarm threshold is fallen below of.
An activation delay can be parametrized.
The alarm is only active, if the respective value has not fallen below of the
post cleaning threshold within the time period of the activation delay.
