Potentiometer input, 25 or 40
amp, din rail power controller
Features
- Allows a customer to dial in a
request from 0% to 100% power.
- Accepts a standard potentiometer
input and provides a high speed, time proportional AC
output (TPO). That is a zero-crossing, "no electronic noise", power
control signal that is ideal for resistive heaters, heat sealing bars,
injection molding nozzle zones, simple cookers, etc.
- Output cycle time ("ON" time +
"OFF" time) = approximately 0.5 second at 50%. Output resolution is one half of
one sinewave (8.3 msec for 60 hz applications).
Note: Rapid pulsing of the heaters
provides the most precise temperature control, PLUS it dramatically increases
the life of the heaters due to a reduction in the thermal stress of expansion
and contraction.
- A standard 0-5k potentiometer
can be mounted anywhere on the machine.
- Any standard 24 volt DC power
supply can be used, such as your existing PLC power supply.
- A 820 ohm, 5%, 1/2 watt resistor
is installed in series.
- A green LED shows input status
on the power controller
- Zero crossing activation -- low
EMI, low noise to nearby electronics
- Available for the 25 amp
DMA-6V25 or 40 amp DMA-6V40
- UL, CSA, CE
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Part
Number
Customer to supply the 0-5k pot,
resistor, and 24 VDC power supply.
DMA-6V25 up
to 25 amps, 660V max, analog input activated DMA-6V40 up to 40 amps, 660V max, analog
input activated
(As an alternative, you could also
use this combination: a 1500 ohm pot; a 270 ohm, 5%, 1/4 watt resistor; 24 vdc
power supply, and a DMA-6V__ solid state contactor.) |
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Specifications
Part
Number |
Line Voltage
Range (VAC) |
Load Current
Range (A RMS) |
|
Max Voltage Drop at
20mA |
|
|
DC
activated |
DMA-6V25 |
24-660 |
.10-25 |
|
6VDC |
|
DMA-6V40 |
24-660 |
.10-40 |
|
6VDC |
|
|
|
Off-State
dv/dt |
1000
v/µs |
Isolation |
4000
volts |
I²T fuse
|
50A
or less, for example: Bussman FWP50A14F, FWC32A10F, FWC20A10F. Ferraz Shawmut
B093910, M330015, K330013 |
Example of
control |
0% =
heater or load is "off" 50% = heater "on" 250 mseconds, "off" 250 msec, "on"
250 msec... 75% = "on" 375 msec, "off" 125msec, "on" 375 msec.... 85% =
"on" 425 msec, "off" 75msec, "on" 425 msec.... 100% = heater "on"
Since the contactor is switching at
the zero crossing mark of a sinewave, there is no electrical noise that might
interfere with nearby electronics. Also, since the calculated ON or OFF time
period is measured in half sine waves, the contactor will automatically adjust
the total cycle time in order to maintain the best ratio of ON/OFF to match
your control input. |
Turn-on
time |
<8.3 msec at 60hz |
Turn-off
time |
<8.3 msec at 60hz |
Terminals |
Will
accept #24-#10 AWG wire. Torque: 7-9 inch lbs. |
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