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POWER SELECTION
RATIO CONTROL
Ratio control is possible between channels using a familiar master/slave configuration. Channel one
(1) must be enabled as the master channel. Any combination of the remaining channels is possible
for slave channel assignment.
TOTALIZER
A Totalizer function is present for each channel with the capability of counting down from a set
point, counting up to a set point or continuous count up. The maximum count is
±
999999 units.
When the set points are reached, a memory flag for each set point is set to a digital ‘1’ indicating a
Boolean ‘true’ value.
The Totalizer set point flags must be polled via digital communication to be
read.
Each flow channel has one low-limit and one high-limit set point available. These alarms are
available via open-collector, opto-isolated outputs on the rear panel as well as serial
communication.
POWER OUTAGES AND THE OVERRIDE CONDITION
In the event of a power outage, even one of short duration, the
POWER
POD
-400
is
designed to conduct a software reset. During the period of time in which the reset is
occurring, it will not accept or respond to any commands either manually or digitally
until the reset process is completed. After said reset, the
POWER
POD
-400
will have
remembered all previously entered set-points but all channels are designed to come up
in the “Override-CLOSEd” condition. For meters, this should have no affect on their
behavior. All analog-only, THI, flow controllers with normally-closed (NC) valves will
close and remain closed until operator intervention manually returns selected channels’
Override condition back to the AUTO mode.
For all other controllers, this means that the control signal (pins 5 to 14) of J1 through
J4 will return to the previously set level. For controllers not taking advantage of the
Override function (pin 8), these controllers will return to their normal, preset operating
condition unless other intermediary steps are undertaken. Controllers that are making
use of the override function (Pin 8) and have normally-open valves will be driven to the
fully open condition.
Power input is switchable between 100 VAC, 115 VAC and 230VAC (50 or 60 Hz) via
the rear panel. For the safety of the operator as well as the device, the correct power
level should be selected prior to connecting to the power mains. See the table
“POWERPOD-400 Specifications” in section 3.0 for the proper fusing when changing
power settings.
