FCU 500, FCU 505 · Edition 02.17
112
Parameters
12 .5 .8 Valve opening time 1 t
L1
Parameter 59
This parameter is used to define the opening time for
the valves (2 to 25 s) which are opened to fill or dis-
charge the test volumes between the gas valves.
If the preset opening time t
L
= 2 s is inadequate (e.g. if
slow opening valves are used) to fill the test volume or
reduce the pressure between the valves, bypass valves
can be used instead of the main valves.
VK
VK
VAS 1
VAS 1
14
13
57
V1
V2
On condition that the gas volume which flows into the
combustion chamber is no larger than 0.05% of the
maximum flow rate, the bypass valves may be open
for longer than the 3 s permitted by the standard
(EN 1643:2000). The required volume limit can be
achieved by fitting a restrictor or orifice, for example.
The opening time to be set is then calculated on the ba-
sis of this restrictor or orifice.
Current rating of safety interlock output (terminal 57):
max. 0.5 A, see also page 127 (Safety interlock output
in the case of higher power requirement)
Calculating the opening time, see page 52 (Calculat-
ing the extended valve opening time)
12 .5 .9 Valve opening time 2 t
L2
Parameter 60
Only available if P53 = 3 (V
p1
+ V
p2
; pressure reduction
via V3)
This parameter is used to define the opening time for
the valves (2 to 25 s) which are opened to build up or re-
duce the gas pressure in the test volumes V
p1
and V
p2
.
FCU 500..C1
µC
P
13
14
15
47
58
48
TC
PZL
PDZ
M
>750°
ϑ
1
2
3
V
p2
V3
V
p1
V1
V2
9.5 m
