Check The Filter Cleaning Function; Check The Automatic Start And Stop Function; Start The Unit; Unit Operation Modes - Nederman FlexVAC Manual De Usuario

tation. Refit the acoustic enclosure when all checks
EN
have been performed.
5.2.1 Check the filter cleaning function
When the unit is in Running mode, see
tion 6.1.3 Running (Running
cleaning button, see
the filter cleaning procedure starts.
5.2.2 Check the automatic start and stop
function
This procedure only works if default PLC set-
tings are used.
• Press the Standby/Running button to put the unit
into Standby mode.
The unit is not to start until a valve is opened at a
workplace activating its microswitch, or the test start/
filter cleaning button is pressed, see the top of
ure 8 and Section 8.3 Filter cleaning in Running
When the valve closes, the unit switches over to Idling
mode and after a delay of approximately 10 seconds, a
filter cleaning operation is performed.
After an additional time delay of approximately 12
minutes, the unit will go into Standby mode.
The filter cleaning delay is set by the DIR_time relay,
and the stop delay is set by the SSR_time relay.
• With all valves at the workstations closed, check
that the motor slows down (a distinct change in
sound can be heard) and that switching to Idling
mode with filter cleaning takes place after approx-
imately 10 seconds.
Approximately 12 minutes after the unit has switched
to Idling mode, it should go to Standby mode due to
the SSR function switching off.
5.3 Start the unit
For more information regarding the initial start-up,
see the 'Installation and service manual'.
Start the unit as follows:
1 Turn the maintenance switch to position 1.
2 Compressed air connected to the unit
3 Press the Standby/Running button on the control
panel, see Figure 7
up and the display shows 'Standby'.
4 The unit starts when the test start button is
pressed, Figure 7
opened at a workstation.
Always switch off the unit at the end of the shift
by pressing the Standby/Running button on the
control panel, or use the weekly timer, see
tion 7.2.3 Weekly timer.
5.4 Unit operation modes
FlexVAC has the following four operation modes:
18
Sec-
mode), press the filter
Figure 7 item 8, and check that
item 9. The white lamp lights
item 8, or when a valve is
Sec-
FlexVAC
1 Off mode
2 Standby mode
3 Running mode
4 Idling mode
See Section 6.1 Status messages
about each mode.
How the unit moves from one operation mode to an-
other is explained below.
As discussed in
unit is in Off mode, the unit can be put into Standby
mode with its motor off and the Filter Cleaning Valve
(FCV) closed by pressing the Standby/Running but-
ton. While the unit is in Standby mode, the unit can be
put back into Off mode again by pressing the Standby/
Running button.
The unit goes from Standby mode into Running
Fig-
mode when it receives a pilot signal by a valve being
mode.
opened at one or more work stations (in other words,
someone starts to work). The unit's motor is now on
and the FCV is closed. The DIR_Time and SSR_Time
timers are not started, see
Section 7.2.1 SSR_Time
The unit stays in Running mode as long as there is an
active pilot signal. However, the unit can still be put
into Off mode by pressing the Standby/Running but-
ton.
Note that if only one workstation is connected to the
unit, or if only one work station is in use and work
stops at that one station, the pilot signal stops. If
there is more than one work station connected to the
unit, and more than one work station is in use, the pi-
lot signal only stops if work stops at all workstations
(in other words, all valves close).
When the pilot signal stops, the DIR and SSR timers
start. If work resumes at one or more work stations
within 10 seconds, the unit stays in Running mode.
The DIR and SSR timers are reset back to zero and are
stopped.
If DIR_Time is set for 10 seconds (default), and the
pause in work is longer than 10 seconds, DIR_Time
elapses. The unit then goes into Idling mode with its
motor on and the FCV open.
If a new pilot signal is sent within 12 minutes, the unit
goes back into Running mode. The DIR and SSR timers
are again reset to zero and are stopped. However,
if SSR_Time is set for 12 minutes, which is the de-
fault setting, and there is no new pilot signal within 12
minutes, SSR_Time also elapses.
The unit then goes into Standby mode until it either
receives a new pilot signal that puts the unit back
into Running mode, or the unit is turned off (in oth-
er words, put into Off mode) by the weekly timer,
see 'Section 7.2.3 Weekly timer
Standby/Running button.
for more information
Section 5.3 Start the unit, when the
Section 7.2.2 DIR_Time
or by pressing the
and