Nordson 108 463C User manual

OBSOLETE
Instruction Sheet
E1999 Nordson Corporation
All rights reserved 108 463C
Issued 6/99 Manual 16-1
P/N 108 463C
Air Flow Switch
The air flow switch is used in manual and automatic electrostatic spray
systems to energize the electrostatic power supply. It is designed to
install directly onto the electrostatic supply unit cabinet and wire into the
power supply’s main terminal block.
The air flow switch is actuated by atomizing air flowing through the switch
when a spray gun is triggered. Inside the switch body, the air flow forces
a magnetic spool upward until it closes a magnetic reed switch,
completing an electrical circuit through the power unit terminal block and
energizing the high voltage output of the electrostatic power supply.
Use the following steps to install the air flow switch onto the electrostatic
power supply.
1.See Figure 1. Locate the pre-punched mounting hole in the center of
the bottom panel of the electrostatic power supply (1). A smaller hole
is provided for the locating pin on the air flow switch (5).
2.Remove the conduit lock nut (6) from the air flow switch connector
and insert the switch’s wire leads into the larger hole. Insert the air
flow switch connector into the hole and line up the locating pin with
the smaller hole.
3.Secure the air flow switch to the power supply bottom panel with the
conduit nut. Tighten the conduit nut securely.
4.Connect the wire leads to the terminal block (7) using one of the
following guidelines:
SEPU-8: Disconnect the jumper from terminals 9 and 10 on
terminal block 1 (TB1) and install the wire leads to terminals 9
and10.
SEPS6 and EPS8: Connect the wire leads to terminals 1 and 2 on
terminal block TB3.
1. Description
2. Installation

OBSOLETE
2
Air Flow Switch
1999 Nordson Corporation
All rights reserved
108 463C
Issued 6/99
Manual 16-1
5. Install the in-line air filter (3) to the IN port (4).
NOTE: Supply air should be clean and dry. Use a coalescent type air
filter. Wet or contaminated air will cause arcing and loss of
electrostatic efficiency.
6. Connect the supply air line to the in-line air filter. The filter port thread
size is 1/4-in. NPT.
7. Connect the air line to the gun to the OUT port (2). The port thread
size is 1/4-in. NPT.
NOTE: Install the atomizing air regulator between the air flow switch and
the gun to increase the air flow switch’s sensitivity and minimize the
pressure drop across the switch. Refer to the
Air Regulator instruction
sheet for regulator installation and part information.
1601001A
1
7
2
3 4
5
6
Fig. 1 Installing the Air Flow Switch
1. Electrostatic power supply
2. OUT port
3. In-line air filter
4. IN port
5. Air flow switch 6. Conduit lock nut 7. Terminal block
2. Installation (contd.)

OBSOLETE
3
Air Flow Switch
E1999 Nordson Corporation
All rights reserved 108 463C
Issued 6/99 Manual 16-1
See Figure 2. Use the following list to order replacement parts for the air
flow switch.
Item Part Description Quantity Note
—295 113 Switch, air flow 1
1295 110 SSwitch, potted 1 A
2940 111 SO-ring, Viton, 0.301 ID x 0.070 wide 1 A
3985 309 SPin, groove, type A, 0.125 x 1.00 1A, B
4- - - - - - SBody, switch 1
5901 526 SFilter, air, pneumatic, in line 1
6933 209 STerminal, push on 2 A
NOTE A: These parts are included in the air flow switch kit, part 106 316.
B: Use a 1/8-in. round punch to remove the old pin before replacing the potted switch. Press the new pin
flush with the switch body surface after installing the new potted switch in the switch body.
1601002A
6
5
4
3
2
1
Fig. 2 Air Flow Switch Parts
3. Parts

OBSOLETE
4
Air Flow Switch
1999 Nordson Corporation
All rights reserved
108 463C
Issued 6/99
Manual 16-1
Original copyright date 1991. Nordson and the Nordson logo are registered trademarks of Nordson Corporation.
Viton is a registered trademark of E.I. DuPont de Nemours & Co.