Teledyne powerpod 400 instruction manual Setting a Channel to Auto Control

8.5.SETTING A CHANNEL TO AUTO CONTROL

Press the desired CHANNEL # key. An asterisk appears in the first space on the line representing the selected channel. The meter display is immediately replaced with the current set point. Pressing the AUTO key causes pin number eight (8) of the 15 pin Sub-D connector to float and returns the previously programmed metering function to the display. Pin 14 signal levels are now available for control.

8.6.SETTING A CHANNEL TO DIRECTLY METER INCOMING SIGNALS

Press the MODE key. The MODE menu appears in the display. To select METER, press 1, and then ENTER. The METER menu allows the selection of the desired channel. Press the number key that corresponds with the desired channel followed by ENTER. The previously programmed display returns with the selected channel reading the signal between pins 5 and 6 of the corresponding channel’s 15 pin D-connector (J1 – J4).

8.7.SETTING A CHANNEL TO DISPLAY THE TOTALIZER FUNCTION

The POWERPOD-400 provides an integrated (Riemann Sum) value of the incoming signal for each channel.

	⎧T = Total		⎫
	⎪		⎪
T = ∑( f S *C * f I ) , where:	⎪ fS	= Fractional Signal Factor⎪
	⎨	= CAL value or Span Value	⎬
	⎪C		⎪
	⎪		⎪
	⎩ f I	= Fractional Time Interval ⎭

Each channel samples the incoming signal at a rate corresponding to the preset A/D conversion rate in Hz. At each sampling interval, the TOTALIZER function multiplies the average signal, as a fraction of the full-scale value (5v, 10v or 20 mA), times the span, or cal, value. This results in a rate for that interval. Next, a time element factor is determined according to the flow rate programmed for that channel as follows.

For a time element of seconds, the factor is 1/10.

For minutes, the factor is 1/600.

Hours use a factor of 1/36000.

Each calculation is summed and stored for a TOTAL value.

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