Operation
6 Operation
6.1
LVS without vacuum controller
Switch the device (LVS 101 Z) on using the main switch. Vacuum is generated immediately
and without regulation.
6.2
LVS with vacuum controller
The Vacuum Controller is switched on by the rocker switch
POWER
located on the device.
The device is ready for operation after a short initializing routine, during which a signal tone
sounds and all light elements light up briefly.
6.3
Operating modes of the Controller
The following modes are available:
0 -
STOP
Controller is inactive and can be configured
1 -
Manual operation
With specification of the setpoint and, if required, lowering
2 -
Automatic operation The setpoint is detected automatically from the pressure development
3 -
Ultimate pressure Pumping out at maximum motor output
6.3.1
Mode 1, Manual operation
The vacuum valve is closed when the pressure reaches the setpoint. Closed-loop control be-
tween the set hysteresis and the setpoint has been started.
For operation with a frequency changer, an analog voltage is output, which controls the
speed according to the standard tolerance. If the set pressure is not reached, the speed is
automatically adjusted to the pressure loss.
If the pressure is actively lowered, after the setpoint has been reached for the first time, it is
lowered still further within a settable timeframe. The number of ramps can be set up to a ma-
ximum of 3. Each ramp starts with a holding time. The setpoint then falls in one step to the
defined starting pressure. The setpoint then falls to the final value over the set time.
After the last ramp, there is a waiting time until the automatic STOP (0 – the last set pressure
is held indefinitely until STOP is pressed manually).
The closed-loop control and hysteresis are always related to the current (reduced) setpoint.
The changed setpoint always applies until the STOP button is pressed, then the configura-
tion value applies once more. When the pressure reduction has finished, the control is stop-
ped, and the system waits until the STOP button is pressed.
6.3.2
Mode 2, Automatic operation
After selection of the operating mode, the controller starts the evacuation. The pressure drop
per minute is determined during this process. If the rate rises above the automatic threshold,
the current pressure is taken as a setpoint, and the system changes into normal closed-loop
control.
6.3.3
Mode 3, Ultimate pressure
By pressing of the key
P min
evacuation takes place at maximum pump speed until the user
presses
STOP
.
115022 Ilmvac
GmbH
21