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Wheel Blast
Applications
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It's as easy as 1-2-3
Step 1. Select method of control
- Manual (Operator watches ammeter)
- Variac control for VLP1000 VAR MagnaValve
- Pot-24 control for VLP-24 or LP-24 MagnaValve
- How to choose manual method
- Automatic
- Controller maintains Amps - use AC-24 Controller for VLP-24
or LP-24 MagnaValve
- Controller maintains actual flow rate - use FC-24 Controller
for WA MagnaValve
- How to choose between automatic method
- How to choose between manual and automatic control
Step 2. Determine Flow rate desired
Note: these flow rates are approximations and shown for reference
only. Many factors can affect actual flow requirements, such as media
type and size, size and condition of wheel parts, etc. If in doubt contact
your equipment OEM Original Equipment Manufacturer for guidance. Many
OEM's already have our valves available in their demonstration shop
or we will be happy to supply valves for evaluation.
Shot
Flow Rate - Pounds (kG) /minute 15" Wheel 25BD150
Courtesy of Wheelabrator Corporation |
|
Idle
Amps |
Full Load
Amps |
2280 RPM |
2800 RPM |
3600 RPM |
|
10 HP
7.5Kw |
5 |
14 |
463
(210) |
345
(157) |
275
(125) |
 |
VLP-24 |
 |
500P-24 |
|
15 HP
11KW |
8 |
21 |
580
(264) |
426
(194) |
343
(156) |
20 HP
15KW |
11 |
27 |
672
(305) |
494
(225) |
392
(178) |
25 HP
19KW |
15 |
34 |
784
(356) |
578
(263) |
440
(200) |
30 HP
22KW |
17 |
40 |
866
(394) |
659
(300) |
515
(234) |
40 HP
30KW |
17 |
52 |
1090
(495) |
910
(414) |
632
(287) |
50 HP
37KW |
19 |
65 |
1370
(623) |
1130
(514) |
930
(423) |
 |
LP-24 |
|
60 HP
45KW |
24 |
77 |
1488
(676) |
1267
(576) |
1030
(468) |
75
HP
56KW |
27 |
90 |
1700
(773) |
1477
(671) |
1260
(573) |
Shot Flow
Rate - Pounds (kg) /Minute 19.5" Wheel 25BD150
Courtesy of Wheelabrator Corporation |
|
Idle
Amps |
Full Load
Amps |
2280 RPM |
2500 RPM |
|
10 HP
7.5KW |
5 |
14 |
342
(155) |
326
(148) |
|
VLP-24 |
|
500P-24 |
|
15 HP
11KW |
8 |
21 |
446
(203) |
422
(192) |
20 HP
15 KW |
11 |
27 |
524
(238) |
494
(225) |
25 HP
19KW |
15 |
34 |
602
(274) |
566
(257) |
30 HP
22KW |
17 |
40 |
706
(321) |
662
(300) |
40 HP
30KW |
17 |
52 |
1008
(458) |
950
(432) |
50 HP
37KW |
19 |
65 |
1314
(597) |
1214
(552) |
|
LP-24 |
|
60 HP
45KW |
24 |
77 |
1486
(675) |
1382
(628) |
75 HP
56KW |
27 |
90 |
1746
(794) |
1622
(737) |
Shot Flow
Rate - Pounds (kg) / Minute 25" Wheel 25BD250
Courtesy of Wheelabrator Corporation |
|
Idle
Amps |
Full Load
Amps |
1800 RPM |
|
10 HP
7.5KW |
5 |
14 |
390
(177) |
|
VLP-24 |
|
500P-24 |
|
15 HP
11KW |
8 |
21 |
468
(213) |
20 HP
15KW |
11 |
27 |
544
(247) |
25 HP
19KW |
15 |
34 |
610
(277) |
30 HP
22KW |
17 |
40 |
698
(317) |
40 HP
30KW |
17 |
52 |
962
(437) |
50 HP
37KW |
19 |
65 |
1204
(547) |
|
LP-24 |
|
60 HP
45KW |
24 |
77 |
1358
(617) |
75 HP
56KW |
27 |
90 |
1578
(717) |
Step 3. Select MagnaValve and Control Combination
| Typical MagnaValve
and Control Combinations |
|
Manual |
Automatic - Amps |
Automatic - Flow |
Low flow rate range
see chart above |
VLP1000VAR
Variac |
VLP-24
AC-24 |
500P
FC-24 |
VLP-24
Pot-24 |
VLP-24
Your PLC |
500P
Your PLC |
VLP-24
Your PLC |
|
|
High flow rate range
see chart above |
LP-24
Pot-24 |
LP-24
AC-24 |
|
LP-24
Your PLC |
LP-24
Your PLC |
|
| Note: the colors indicate
large or small valve selection based upon approximate flow rates
shown above. If in doubt contact your original equipment manufacturer
for guidance. Most OEM's have machines in a demonstration room equipped
with our MagnaValves to assist your selection. |
How to choose manual method of control
There are two manual methods available to control the VLP or LP MagnaValves.
The Variac control is the simplest method. A variac is a variable-transformer,
it's name comes from variable ac, thus variac. It's like a mechanical
transformer with 120 steps for voltages from 0-120 Vac output. When
this device is used to control the VLP1000VAR it regulates the voltage
to the valve and thereby controls the amount of media flow. The variac
can be mounted with operator access, perhaps near the panel wheel motor
ammeter for convenience. Or, if you prefer the operator not have access
to the control, then mount it inside the electrical control cabinet.
Note: The variac control, since it is a mechanical device, can NOT be
used with a PLC to set the flow rate.
The second method of manual control uses the Pot-24 which is a panel
mounted potentiometer and transmits a 0-5 Vdc signal to the VLP-24 MagnaValve.
The advantage of this type of control, over the variac, is the addition
of an output limit function. A small adjustment is available on the
back side of the Pot-24 that allows setting the maximum output signal
from 20% to 100% of the 0-5 Vdc range. This feature can be used to prevent
the operator from setting too high of a signal and thus overloading
the wheel motor.
There is another method a manual control available if your machine has
a computer or PLC with analog signal capability. If you use this method
you do NOT need the Pot-24 control module. You'll need to provide three
functions: 1) 24 Vdc @ 2 Amps power continuously to the MagnaValve,
2) 24 Vdc "Enable" signal to the MagnaValve when you are ready to operate
or flow media, and 3) 0-5 Vdc analog signal to tell the MagnaValve how
much media to flow. Note: since there is no feedback used you will have
to experiment with the 0-5 Vdc signal to achieve the desired flow rate
and motor amps. If you use two or more MagnaValves it is likely, due
to manufacturing tolerances of the valve and your machine configuration,
that you will need different 0-5 Vdc signals to achieve exactly the
same motor amperage. Back to Top
How to choose an automatic method of control
There are two choices for automatic control of a MagnaValve, motor amps
and actual flow rate. The VLP and LP MagnaValves can be connected to the
AC-24 (Amperage Control) and the flow rate will be regulated to maintain
a desired wheel motor amperage. Alarms are provided in case the media
flow rate fails to draw the required amps (no media available or media
flow-path blockage). The advantage of this type of control, over manual
control, is that it does not require the operator to constantly monitor
the motor amps. The AC-24 Control can interface with your PLC analog output
signal or it can use its own setting provided by the front panel buttons.
Another method of automatic control is available when the WA MagnaValve
is used with a model FC-24 (Flow Control). The WA MagnaValve has a built-in
media sensor that detects the presence of steel shot or grit. A special
module at the valve converts this signal into a 0-5 Vdc output which is
sent to the FC-24 Control for comparison to the requested media flow rate.
The FC-24 Control will monitor and control the flow rate continuously
and activate an alarm in the event there is a media fault (no media or
blocked media flow path). There are two situations to be aware of when
applying the WA and FC-24 combination. First, you have to be careful to
not command more media flow rate then the wheel can deliver (i.e. don't
overload the motor amps) and second, you should have the capability to
perform annual media flow rate calibrations. This second concern can also
be accommodated by exchanging WA valves on an annual basis. After the
original valve is replaced it can be sent to Electronics Inc or an authorized
service center to be re-calibrated and refurbished if necessary.
Back to Top
How to choose between manual control and automatic
control
The choice between manual and automatic control is usually determined
by financial budgets and desire to avoid incorrect processing. If your
application is such that you can rely upon an operator to monitor the
wheel motor amps then you may not benefit from the advantage of automatic
control. If your previous experience had no instances of too low (or too
high) media flow rate then you can probably continue to rely upon manual
control. If incorrect processing might result in substantial cost penalties,
due to re-work or damaged production, then the small investment in automatic
control will soon be rewarded. It doesn't take very much damaged product
to pay for the cost of automatic control. Furthermore, when you use automatic
control you can take advantage of computer logic when different processing
is required. Different flow rates can be applied for different line speeds
or different wheel speeds.
Back to Top
