Nederman E-PAK 300 DX Manuel D'instruction page 41

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With the duct system completely closed, including all valves at all
workstations, check that the vacuum limiting valve (or both, if two are fitted)
opens and lets in air to limit the vacuum. An increase in vacuum will cause
the valve to lift and let air into the fan. Check that the valve moves freely and
allows air into the fan.
9.3 Operation
9.3.1 Start/stop operation
To operate E-PAK 150 DX/300 DX/500 DX, use the buttons and switches on
the control panel, see Figure 12.
To start the unit, turn the standby and reset switch to position 1.
If a PS cable is connected to E-PAK 150 DX/300 DX/500 DX, the unit will
automatically start when, for example, a valve at a workstation in the central
extraction system is opened.
If there is not any PS cable connected, start the unit by pressing the manual
start button.
To trigger a manual filter cleaning, press the manual filter cleaning button.
Always switch the standby and reset switch on the control panel to position 0
when work is over for the day, even when the unit has automatic start and stop.
9.3.2 Fault signals
The control panel has two fault indicator alarms, a red fault indicator light
(bottom, right) and a yellow one (bottom, left), which will light up when a fault
occurs, see Figure 12.
The following standard faults will cause the red fault indicator light to light up:
• The motor overload relay has tripped.
• The fan thermal switch, see Figure 5, item 6, has tripped.
• The pressure switch, see Figure 5, item 8, above the control filter has
tripped.
• The explosion relief panel sensor has tripped.
In addition, connected accessories, such as an external alarm input or a CAS,
will also result in a red fault signal.
The yellow fault indicator light signals an increased pressure drop over the
control filter. The unit will continue to operate, but we strongly recommend
that the reason for the fault is investigated. See Chapter 12 Troubleshooting to
find the cause of the alarm. See Chapter 10 Maintenance for replacement of the
control filter.
NOTE!
Continuous operation with the yellow fault indicator light lit may
result in severely reduced performance and overheating of the side channel fan.
9.3.3 Resetting fault signals
If the red fault indicator light lights up, the cause of the fault is to be
investigated. See Chapter 12 Troubleshooting for instructions on how to
identify the cause of the problem and which actions to take.
E-PAK 150 DX/300 DX/500 DX EN
41