38
HE 5422 Operating Instructions
# 342338 | Version 1.3
IN IN IN
1. The cleaning relay is closed as long as the start
input (start) is closed.
2. The cleaning relay is closed for the set post-
cleaning time with a sensor signal at the post-
cleaning input (Postcl.).
3. The measured value is frozen/held.
Supply voltage
Please only connect 24 VDC or 100 - 240 VAC!
For HE 5422 HD it is imperative to note the
following:
When connecting the 24 VDC supply, earth must be
connected via the PE terminal of the VAC mains
supply.
Operating or error signal relay
The
NC
contact is closed during error-free operation. If
there is an error, the
NC
contact is open and the
NO
contact is closed.
The following causes lead to an error message
(see
section 11 Error messages
1. Power failure
2. Device fault (parameter error)
3.
Δp sensor error / measuring range exceeded
Cleaning relay
The cleaning relay is closed when:
1. the "upper threshold" is exceeded and until the
value falls below the "lower threshold"
2. the value falls below the "post-cleaning
threshold" for the post-cleaning time if the
"lower threshold" was previously exceeded
3. closed start input
4. a sensor signal on the post-cleaning input for
the post-cleaning time.
p-high alarm relay
The relay is closed when the
p-high alarm threshold
is exceeded.
A switch-on delay can be parameterized.
p-low alarm relay
The relay is closed when the
p-low alarm threshold is
undershot.
A switch-on delay can be parameterized.
The alarm only becomes active if the post-cleaning
threshold is not exceeded within the switch-on delay.
