Page 16 of 42
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.
)
*
*
(
I
S
f
C
f
T
∑
=
, where:
=
=
=
=
Interval
Time
Fractional
f
Value
Span
or
value
CAL
C
Factor
Signal
Fractional
f
Total
T
I
S
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.
