TB 2.1 Variable Speed Control Box Dual
2746 Via Orange Way  Spring Valley, CA 91978  Ph 619.670.9590  Fx 619.670.7345
Toll Free: (800) 472-6326  Sales@EuramcoSafety.com  www.EuramcoSafety.com
Document #: TB2.1 Rev: 0
Name: Var. Speed Cont. DC
Date Created: 09/28/10
TECHNICAL BULLETIN
Replacement, installation and alignment of the Dual Current, Variable Speed Controller Board
This technical bulletin applies to RAMFAN blower model: EV400, PN: EB80500
Tools/Materials required: #2 Philip Screwdriver, Vishay / Spectrol #008T000 Adjustment Blade
Driver, 0.082” X 0.015”, or equivalent.
WARNING!
When plugged into a power source the control board becomes alive and presents lethal shock
potential. Do not touch any circuit components. Wear safety glasses to protect you eyes against
possible sparks and exploding circuitry.
Inspections: Make sure fan is UNPLUGGED before moving on.
Process Summary: This procedure should only be carried-out by trained service technicians.
The procedure to follow covers the:
1. Opening of the controller box
2. Removal control board
3. Installation new control board
4. Board Configuration for 115VAC operation
5. Control adjustments
6. Closing controller box
Installation Instructions:
1.0
Open Controller Box
1.1
Remove the six (6) Philip head screws from the heat sink cover on the control box.
1.2
Save the screws for reuse later.
1.3
Flip heat sink cover with control board over, onto the fan shroud.
2.0
Remove Control Board
2.1
Disconnect the power wire, motor wire, and control wire connections to the control board.
2.2
Make a note of which screws locations are used for ground wire, (yellow / green wire),
connections.
2.3
Make location notes of all wires removed from the control board.
2.4
Make a note of board position on heat sink before removing mounting screws.
2.5
Remove the four (4) Philip head screws retaining the control board to the heat sink.
2.6
Remove the control board and set it aside.
3.0
Install New Control Board
3.1
Position control board on heat sink.
3.2
Install all four mounting screws and the two ground wires.
3.3
Reattach all wires, previously removed.
AC Input:
Wire
Black
White
Green/Yellow
From
AC Power Cord
AC Power Cord
AC Power Cord
1 of 5
To Control Board
AC Line Fuse
L2 Terminal
Ground Screw
ON / OFF - Speed Control Wires:
Wire
From
Yellow
Speed Potentiometer
Orange
Speed Potentiometer
Blue
Speed Potentiometer
Red & Black
Speed Potentiometer
To Control Board
P3
P2
P1
EN
DC Motor Wires:
Wire
Brown
Blue
Green/Yellow
To Control Board
Armature Fuse
AGround Screw
From
DC Motor
DC Motor
DC Motor
Note: Reversing the brown and blue DC motor wires causes the motor to
spin in the opposite direction.
4.0
Board Configuration for 115VAC Operation
4.1
Move the J1 jumper to the 115 VAC position.
4.2
Move the J2 jumper to the 90VDC position.
4.3
Set the DECEL potentiometer to the 1 o’clock position.
4.4
Set the ACCEL potentiometer to the 5 o’clock position.
4.5
Set the MAX potentiometer to the 12 o’clock position.
4.6
Set the MIN potentiometer to the 12 o’clock position.
4.7
Turn the IR potentiometer fully CCW and back-off about 1/8 of a turn.
4.8
Turn the CL potentiometer to the 2 o’clock position.
5.0
Control Adjustments
5.1
Attach an AC amp meter to either L1 or L2 wire on the AC input side of the control board.
5.2
Plug unit into an appropriate 115 VAC power source.
5.3
Lift the red switch protector and toggle the Dual Current switch to the 20 Amp position.
5.4
Rotate the ON / OFF switch / speed control knob to the ON minimum position.
5.5
Adjust the MIN potentiometer for 2 amps of AC line current.
5.6
Turn the variable speed control knob to the maximum position.
5.7
Adjust the MAX potentiometer for maximum AC input amps on meter.
Note: Do not exceed 18.5 amps.
5.8
Adjust the CL potentiometer CCW, slowly, just until the RED CL LED turns red.
5.9
Turn the CL potentiometer CW, slowly, just until the RED CL LED turns off.
5.10
Turn the variable speed control back down to minimum and ensure the AC input amps have
returned to 2 amps. If not repeat adjustment steps 5.4 through 5.8 above.
5.11
Locate the small trim potentiometer glued to the side of the dual current switch.
5.12
Tap the red dual current switch cover to engage the 15-amp circuit feature.
5.13
Turn the ON / OFF – speed control knob fully clockwise.
5.14
Carefully adjust the small trim potentiometer until the amp probe reads 13 amps.
Note: AC input current will raise 1.5 to 2.0 amps as the motor warms-up.
6.0
Close Controller Box
6.1
Ensure control board mounting screws are tight.
6.2
Place heat sink cover over box. Ensure gasket is in place and not damaged.
6.3
Secure the heat sink cover to box with the six (6) screws saved from above.
6.4
Ensure compression fittings are tight to power cords entering the box.
2 of 5
7.0
Photographs
Removing Screws from Heat Sink Cover
Flip Heat Sink Cover with Control Board Over onto Fan Shroud
Ground Wire Location
Ground Wire Location
3 of 5
J1 Jumper Location & 115 VAC Set Position
J2 Jumper Location & 90 DC Set Position
EV400 Control Board Layout
Location of blue trim potentiometer
4 of 5
Clamp-on Amp Meter
5 of 5
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