Installation; Control Box; Electrical Connections; Monitoring Point - Nederman Airflow Alarm Kit Manual Del Usuario

4 Installation

Installation, repair and maintenance work is to be car-
ried out by qualified personnel using only original Ne-
derman spare parts. Contact your nearest authorized
distributor or Nederman for advice on technical ser-
vice.

4.1 Control box

Figure 3 shows the Airflow Alarm and pressure switch
mounted.
1 Pressure switch
2 Airflow alarm
NOTE!
• Before starting installation, an unused volts-
free contact from the fan starter should be
wired through to the Fan ON position.
• The Airflow Alarm control box must be in-
stalled outside the ATEX classified zone.
• The optional flashlight should be situated at
a location visible from the workplace(s) mon-
itored.
• The electrical enclosure should be mounted
near the workplace so that the alarm LEDs
can be clearly seen and noted from the oper-
ator's working place.
• If the operator does not have a permanent
place or where several working places are su-
pervised by one alarm, a flashlights should
be installed so that the alarm may be clearly
seen from the operator's working places.

4.2 Electrical connections

WARNING! Risk of personal injury
Work with electric equipment is to be carried
out by a qualified electrician.
Figure 2 shows the wiring diagram and cabling for ter-
minals for the Airflow Alarm.
Electrical connections between components should
comply with current national regulations.

4.3 Monitoring point

WARNING! Risk of personal injury
• If there is flammable dust present, turn off
the fan.
• Eliminate ignition sources such as heat or
sparks.
• Wear a dust mask.
Airflow Alarm Kit
NOTE!
• A non-ATEX-approved differential pressure
switch must be installed outside of an ATEX
classified zone.
• Any screws or other fixings used into the air
duct must not cause any collection of dust/
chips. If the differential pressure switch
housing is conductive, there needs to be con-
tact between the pressure switch housing
and the metal duct or ground.
The monitoring point is selected as follows:
When monit-
oring
One single
workplace
A group of
workplaces
The pressure switch can be mounted on the air duct.
NOTE!
When drilling in air ducts, safety regulations
must be kept in mind.
The hose is connected to the hose connection on the
pressure switch marked with a minus (-) sign. Nothing
is connected to the hose connection marked plus (+)
atmospheric pressure.

4.4 Startup

When the fan starts, the alarm is activated, and the
ALARM LED remains lit until the required pressure is
reached. The ON LED is also lit.

4.4.1 Adjustment

1 A suitable part of the duct is selected, and a hole
for the protection filter is drilled close to the last
connection point. See
2 The maximum airflow according to the order ac-
knowledgement, technical specifications etc.
must be determined and the corresponding air ve-
locity calculated.
3 The air velocity is measured with the planned
number of extraction points open. If the airflow is
larger than (V
this can be done by inserting a plate in front of the
fan outlet flange to reduce the airflow until the
airflow (V
4 At this airflow, the static vacuum at the monit-
oring point (PS
monitor is set 10% lower. See
alarm limit setting is represented with the dotted
line.
Location
Between dust extraction point,
such as a suction hood, and a
connection to the duct system.
Close to the connection point
farthest away from the fan. See
Figure 3.
Chapter 4 Installation.
), reduce the airflow. For example,
0
) planned is reached.
0
) is measured, and the pressure
0
Figure
EN
4, where the
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