Potentiometer input, 25 or 40
amp, din rail power controller
- 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
- 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
Customer to supply the 0-5k pot,
resistor, and 24 VDC power supply.
to 25 amps, 660V max, analog input activated
DMA-6V40 up to 40 amps, 660V max, analog
(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.)
Range (A RMS)
||Max Voltage Drop at
or less, for example: Bussman FWP50A14F, FWC32A10F, FWC20A10F. Ferraz Shawmut
B093910, M330015, K330013
heater or load is "off"
50% = heater "on" 250 mseconds, "off" 250 msec, "on"
75% = "on" 375 msec, "off" 125msec, "on" 375 msec....
"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.
||<8.3 msec at 60hz
||<8.3 msec at 60hz
accept #24-#10 AWG wire. Torque: 7-9 inch lbs.