AW Gear Meters EMO-3000 - Manual (Page 12)

EMO‐3000
Operation and Programming Manual
11
Monitor Mode (operating mode = 01)
Monitor Mode is used for applications where it is important only to monitor flow rates and totals. This
mode also provides analog and limit outputs. The programmable limit values turn a relay contact either
ON or OFF. The 4‐20 mA or 0‐5 volt analog outputs can be scaled to the flow rate or the total, which can
be recorded in strip chart form, as a digital recording, or sent to a PLC via the serial communication link.
If only flow rate and totalization are required, enter the programming mode (F4), select General A (F2)
and program the desired variables (see page 24 for specific details). Or for use of generic flow rate and
totalization factors and engineering units, enter the Quick Programming selection (see page 32).
If analog outputs or limits are to be used in the monitor mode, program the following additional
variables:
 ANALOG GAIN FACTOR: Scales the mA or the voltage out.
 POINTER: Address for the variable that should be expressed.
 OFFSET: A programmed mAmp or voltage output, which corresponds to a zero input frequency.
 LIMIT OUTPUTS: See page 15 for further programming.
When shipped, the channel cards are in monitor mode. However, the 4 opto‐couplers, pins 11, 12, 13
and 14 are set for the PID mode in that three of them are inputs and one is an output. A pin can be
either an input or an output depending on the way the opto‐coupler chip is set. If you select the monitor
mode and wish to use the limits, then move the opto‐coupler chips to make the pins functional. To
change the Input/Output chips, refer to the INPUT/OUTPUT section on page 14.
PID Mode 02 (operating mode = 02)
The PID mode 02 is designed to control fluid flows. To have the EMO‐3000 operate in PID, it is necessary
to prepare several PID variables.
Before changing modes and variables, disconnect the control valves and all control signals (such as hold,
transparent, etc.).
Important Variables to Program for PID Operation
(For details about programming the EMO‐3000 with the DM‐3000, see page 23.)
Proportional This factor determines the strength (or stiffness) of the closed loop control. In many
cases, only experimentation can determine this factor. Start with a relatively low number (between 10
and 20); too large a number can cause oscillations.
Notice