AW Gear Meters EMO-1005 - Manual (Page 26)

AW-Lake Company 8809 Industrial Drive, Franksville, WI 53126  web: www.awgearmeters.com
 Tel: 262-884-9800  Fax: 262-884-9810  Email: [email protected]
REV. 1a 05/98 EMO-1005 Manual.DOC
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GUN-ON PI CONTROLLER (Select 3)
When a 3 is selected in the previous screen, the channel card will be designated as a PI Controller with
the Gun-On option. The only difference between this and the standard PI Controller is the Gun-On
feature which makes the Analog Output increase until the EMO-1005 starts to see a feedback
frequency. When the EMO-1005 is in this mode, the initial kick has no affect on the Analog Output. In
order to turn on the Gun-On feature, the Limit 4 (Pin 11) must be connected to pin 1 (+15V) and the
RESET (pin 9) must be jumped to the Limit common (pin 15). When the EMO-1005 sees a set signal
but no frequency return it immediately starts to increase the Analog Output until a feedback frequency
is recognized.
COMPLEX RATIO MODE (Select 5)
This is a monitoring function - not closed loop control of ratio delivery.
This ratio mode applies to channel one only; it takes the rate of channel 1 and divides it with the rate of
channel 2. The channel 1 outputs are affected by the ratio calculations as shown below:
KFA * KFR Ch1 * RATE Ch1
Analog Out =
KFR Ch2 * Rate Ch2
Complex Ratio mode has no effect on the display (Simple Ratio does - pg. 7). In this mode, however,
the outputs are also modified. In Complex Ratio mode, the values programmed in the dour totalizer
limits will be compared to the Analog Output numeric value.
The limits will be turned ON if the Analog Output value is larger than the programmed totalizer value -
- this can provide a ratio alarm indication.
The Analog Output is a number between 0000 - 1023, where 0000 equals 0 Volt and 1023 equals 5
Volts. If channel 2 is not inserted or the rate of channel 2 is zero, then the output of channel 1 is 5 volts
(1023 steps). If the Analog Offset is programmed, then the regular offset rules apply.
Example: A two component flow measurement system is needed and flow 1 is two times the flow 2.
Also, a limit alarm is needed for a 5% high and a 5% low measurement. Then channel 1 of the EMO-
1005 would be programmed as a Complex Ratio Monitor. The flow 1 frequency would be connected
to the channel 1 frequency input and the flow 2 would be connected to channel 2 frequency input. By
using the ratio analog out formula, the KFA (Analog Output) can be set to give a 2.00 VDC (2V = 410
steps) output when the ratio is correct. Then, by wetting totalizer limit 1 to 431 steps (2V +5%) and
totalizer limit 2 to 390 steps (2V -5%), the two limits will give a signal when this margin has been
exceeded.
** CAUTION ** Never program the channel 1 card to be a Complex Ratio Monitor unless the
channel 2 card is installed. If this is done the EMO-1005 unit will lock up.