Electronics LP-24 User Manual

Instruction Manual

Low Profile MagnaValves

Electronics Inc.

56790 Magnetic Drive

Mishawaka, Indiana 46545

1-800-832-5653 (Toll Free)

Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Website: www.electronics-inc.com

Model LP-24 and Model VLP-24

IM:0083 Revision: B Date: 11/1/2012

Made in the USA

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WIRE CONNECTIONS FOR VLP-24 OR LP-24 TO AN AC-24 A MPERA GE CONTR OLLER

NOTE : The valve must be loc ate d as close to the wheel

as possible for bes t servo cont r ol stabili t

5 feet or close r

Customer CT
100:5 etc.

PANEL METER

(IF USED)

0

VLP-24/LP-24

4) Orange 0-10 Vdc input

6) Blue 24 Vdc Enable

2) Red 24 Vdc Supply

5) Black 0 Vdc Common

WHEEL
MOTOR

AC-24 Controll er

8) Servo Out

9) Valve Enable

19) 24 Vdc Supply

20) 0 Vdc Common

3

1. WHITE

4

5

6

NOTE: The Controller's Full Scale display (typical

100.0) must match the customer's current
transformer rating (typical 100:5 ratio). Adjust the
control display range to match the actual
transform er ratio. See instru ction manual.

2

2. RED

3. GREEN

4. ORANGE

5. BLACK

1

6. BLUE

0-5 amps

L3

L2

L1

Use 12 AWG wire for current loop. Use
10 AWG or larger for runs over 15 ft.

AC-24 Rear Terminal

Current Shunt
.05 ohm 5 watt.
P/N 999200
Included with
controller.

7

.

100

(0-5A)

*

Remote setpoint can come
from customer potentiometer
or 0-10 Vdc signal. Also see
model Pot-24 rem ote pot.

.05 Ohm shunt

.05 Ohm shunt

VLP-24 Or ange

VLP-24 Blu e +24Vdc to VLP-24 RED

Note: Connect power supply directly to the MagnaValve first and then run power back to the control using minimum 16 AWG
wire size t o prevent (high curr ent ) voltage drops. Pow er supply should be re gulated and rated at 50VA per valve.

CW

2

0 Vdc
common

5

Alternate: Long length of curren t loop may cause
inaccuracy. To keep the 0-5 Amp current loop sh ort
you may place the .05 ohm shunt at the transformer
termina ls and run 18 AWG shielded ca bl e f rom shunt
to control.

0Vdc to VLP-24 BLACK

www.magnavalve.com

2

Diagnostic LED’s

VALVE ON – When this LED is on or blinking, the electromagnet is receiving power. When the LED

is off, the permanent magnets will hold or block the shot flow. When the LED is on, but not blinking,
the valve flow rate is at full capacity. When the LED is blinking, the electromagnet is regulating the
shot flow.

Vin > 0.25 Vdc- This LED indicates that the valve is receiving an analog signal input greater than

0.25 Vdc. When this LED is off there is no media flow allowed. The input signal range is 0-10 Vdc. At
10 Vdc the valve will “open” to full capacity, which is usually 10% to 50% higher than the calibrated
range. The relationship between the 0-10 Vdc input signal and actual flow rate is nonlinear. The out­put signal 0-10 Vdc signal is linear and this makes accurate regulation by the AC-24 control possi­ble.

24Vdc ENABLE – This LED indicates that the valve is receiving a 24 Vdc Enable signal. When this
LED is off, the valve is inhibited, and no shot will flow. This feature is an on-off action so there is no
need to disable or remove the 0-10 Vdc input signal.

24 Vdc Power – This LED indicates that 24 Vdc is available to operate the electromagnets for me­dia flow. It should always be available and able to supply 2 Amps. If the LED is blinking, the supply
is above the recommended operating range +/- 2VDC (22-26VDC). If the LED is OFF, then the sup­ply is below the recommended range. If that condition occurs, please call for technical support.

All of the LED’s must be on in order to have media flow.

3

This manual will explain how to replace the mechanical media (grit) valve on a wheel type blast
cleaning machine with the new MagnaValve automatic media regulator. The two most prominent
reasons for this type of upgrade are:

a) to eliminate maintenance required for the air cylinder that operates the mechanical valve
b) to provide an automatic alarm to alert the operator to replenish the shot/grit supply

The machine used for illustration in this manual is a RotoPeen system from Pangborn Corporation
modified to shot blast clean 20 foot lengths of round pipe. It is a single wheel, 20 horsepower, pass­thru cabinet design as shown in Fig. 1 below.

Fig. 1

The following text will describe each of the remaining photos in three sections, before, during and
after the installation of the MagnaValve. The entire project required less than one day for the con­version.

Note: To operate properly and prevent damage to the MagnaValve, always supply the full flow ca­pacity of the valve. For example, a VLP will flow 1000lbs/min. While only 400lbs maximum is re­quired for the application, the MagnaValve must be supplied the full 1000lbs to operate correctly. If
an amount less than 1000lbs is supplied, the shot travels through the valve at a high velocity, and
can damage the valve.

4

Fig. 2 An air cylinder was used to
open and close the original mechanical
valve as shown. This air cylinder was
controlled by a manually operated 2­way air valve. The air cylinder moves
the mechanical valve from its closed to
open position. The amount of opening
was pre-set by the operator by adjust­ing a nut on the linkage of the air cylin­der to limit the stroke.

Fig. 2

Fig. 3 This figure shows an ammeter

reading of approximately 8 amps, the
no-load or no shot flow condition. A
conventional panel ammeter (0-30
Amps) was used to indicate motor
amps and relative shot flow rate. It is
not uncommon for these meters to be
inaccurate because metallic dust col­lects inside the meter movement mech­anism. This prevents the meter from
displaying the proper amperage.

Fig. 3

5