Kromschroder FCU 500 - Large Test Volumes with Reduced Testing Time

FCU 500, FCU 505 · Edition 02.17 46
Valve proving system
7.1.5 Large test volumes with reduced testing time
The testing time for the tightness test can be reduced
for a large test volume. Two pressure switches are re-
quired for this, see page 111 (Large test volumes).
The first pressure switch is set to ¼ of the inlet pres-
sure p
u
, the second one to ¾ of the inlet pressure.
Parameter 70 must be set to 1 for this purpose, see
page 116 (Function of terminal 65).
Program sequence
The tightness control queries the pressure p
Z
using
the first pressure switch (p
u
/4). If pressure p
Z
> p
u
/4,
program A starts, see page 47 (Program A (reduced
testing time)). If pressure p
Z
< p
u
/4, program B starts,
see page 47 (Program B (reduced testing time)).
P
Z
L
P
Z
H
FCU 500..C1
µC
P
4
9
13
1
450
4
75
8
48
T
C
PZ
L
PD
Z
M
>750°
ϑ
1
2
3
V
p1
V1 V2
p
u
p
z
p
d
p
u
/4
PZ PZ
3p
u
/4
65
45
1
2
▼