Asco JOUCOMATIC 343 Serie Puesta En Marcha Y Mantenimiento página 15

SYSTEM PRESSURISATION AND DEPRESSURISATION CURVES
SYSTEM PRESSURISATION AND DEPRESSURISATION CURVES
• WITH AUTOMATIC SOFT-START DEVICE
Pressure
Pa
Pb
1
T1
The adjustment range for pressurisation lies between curves (1) and (2).
The transition to full flow takes place automatically as soon as the downstream pressure reaches 60 to 70% of the upstream pressure.
Filling and venting times (in seconds):
T1 (with screw loosened by 6 turns).
T2 (with screw loosened by 1 turn).
T3 (venting time)
These times correspond to a supply pressure (Pa) of 6.3 bar, a transition pressure (Pb) of 60% to 70% Pa (not adjustable)
and a downstream capacity of 10 litres.
• WITH A SOLENOID/AIR CONTROLLED SOFT-START DEVICE (Modulair 112 type only)
Pressure
Pa
1
T1
Unlike the automatic soft-start vrsion, this version only authorises full flow on receiving a permanent electrical signal
(see note below).
The adjustment range for pressurisation lies between curves (1) and (2).
Filling and venting times (in seconds):
T1 (with screw loosened by 6 turns)
T2 (with screw loosened by 1 turn)
T3 (venting time)
These times correspond to a supply pressure (Pa) of 6.3 bar, a downstream capacity of 10 litres and a pressure of 90% Pa.
The full flow position is determined by the pilot valve which must be energised
after checking that all the end-of-cycle sensors are activated. It also enables
fast triggering of pressurisation if the shutdown occurs at the end of the cycle
(see curve A) or close to the end of the cycle (see curves B
Minimum pressurisation time (curve A): 1s with an upstream pressure of
6.3 bar and a capacity of 10 litres.
The solenoid/air controlled soft-start device also enables:
- Full flow operation in the "automatic" mode and slow speed operation in the "adjustment" mode for step-by-step manual air feed.
- On returning to the "automatic" mode, the first cycle(s) can be carried out at low speed (as long as the solenoid pilot valve is
not energised).
Pb: 60 to 70% Pa
2
T2
2
T2
Depressurisation
of system
T3
Modulair 107
11,5
250
6,5
Transition to full flow
triggered by external
electrical signal
Modulair 112
12
110
2
Pa
A
, B , B , etc.)
1 2 3
: curve for pressurisation of downstream circuit in
accordance with the adjustment (soft-start device
in inactive position)
15
Time
Modulair 112
8
75
2
Depressurisation
of system
B
3
B
2
B
1
GB
T3
Time
t