7. Use «Up» or «Down» to select the
Set speed line.
4 0 0 m b a r
0 8 : 1 5 A M
8 0 ° C
Header
5.4.1 Fixed speed
Menu
block speed
n_min
500/min
n_max
3600/min
------------------------------
Set speed
1760/min
Active line
current
1750/min
8. Press «Enter».
The setting mode is active.
9. Use «Up» or «Down» to set the
Set speed value.
10. Press «Enter».
The setting is applied.
Result The
Fixed speed mode is set.
Pressure peaks caused by an excessively fast run-up of the speed
➤ Set the change speed for the speed (see chapter 8.6.8).
8.6.4 Pressure control
When the machine runs in
Pressure control operating mode, the frequency converter automatically
compensates for deviations between the target pressure and the actual pressure by changing the
speed of the drive motor (direct) and, thereby, the blower block (indirect). The blower block speed
determines the flow rate. By changing the speed, the frequency converter adjusts the flow rate to
the consumption and constantly maintains the system pressure within the regulating range of the
machine between minimum and maximum flow rate and minimum and maximum speed.
8.6.4.1 Setting the controlled variable
In the 5.4.2
Pressure control menu, select the signal for the Source actual pressure parameter that
the system uses to regulate:
■ p1 (inlet pressure)/p2 (discharge pressure)
■ dp (differential pressure)
■ AII1.02 (Current signal AII1.02)
Precondition Access level 2 is activated.
1. Open the 5.4.2
<Configuration – Operating modes – Pressure control> menu.
2. Use «Up» or «Down» to select the
Source actual pressure line.
8
Initial Start-up
8.6
Operating modes in frequency-controlled machines
96
Service Manual Controller
SIGMA CONTROL 2 BLOWER ≥ 4.0.X
No.: 901700 14 E
