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3.16
D
(Pwm)
iGital inPut
This digital input can be used to receive information on the % of power to be supplied to the load.
The signal can be generated by a controller or external plc via digital outputs (logic output for Gefran instrumentation).
This is obtained by alternating the output in ON for time TON with the output in OFF for time TOFF.
The sum of TON+TOFF is constant, and is called CycleTime.
CycleTime= TON+TOFF
The power level is given by the ratio = TON/ CycleTime and is normally expressed in %.
The GFW digital input automatically adapts to the cycle time from 0.03Hz to 100Hz and obtains the power % to be supplied
to the load from the TON/(TON+TOFF) ratio.
Connection example:
Temperature control with Gefran 600 with D type logic output (out2) (cycle time: 0.1sec), GFW without PID option, logic
output can drive max 3 GFW in series (preferable), connection allowed only if GFWs do not have interconnected GNDs (if so,
make parallel connection).
Figure 55
Controller
Digital inputs
Logic output
D type
41
80993B_MHW_GFW-Xtra_06-2018_ENG
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