Connecting The Equipment - Accu-Flo Meter Service TM Series Owner's Manual

4. All enabled units-of-measure remain visible and selectable
– the entered correction will be applied to all enabled units.
5. To return to factory calibration (FAC), press and hold both
CALIBRATE and DISPLAY buttons for about 3 seconds until
FAcCAL is displayed. Then release buttons. Unit should
return to normal operation and FAC icon is visible.
WIRING

Connecting the Equipment

1. Remove the faceplate by removing the four corner screws.
2. Attach wiring from your equipment according to the following
terminal connections and wiring instructions, depending on
your circumstances. (See Terminal Locations)
The display may be powered by battery, externally powered or
both. When both are used (external power terminal as primary
with the battery terminal as back up) the batteries should last up
to 5 years. Connection and disconnection of either power input
while the other is active will not interrupt operation of the display.
CAUTION
Determine maximum power supply voltage after determin-
ing maximum allowable voltage of all electronic devices
in the system.
T E R M I N A L L O C A T I O N S
9V_BAT+
Battery, 6.5V to 20V
EXT_V(+)
External Power, 7V to 30V
COIL_B /
To Flowmeter Sensor
COIL_A
To Flowmeter Sensor
OC_OUT
• This is an open-collector or current-sinking output
when NO JUMPER is attached at OUTPUT P.U.R.
location. It can sustain closed-circuit current of up
to 200 mA and open-circuit voltage of up to 60V.
• This is an active-drive output when the JUMPER
(supplied) is attached at location OUTPUT P.U.R. The
JUMPER applies an internal 10K Ohm resistor as a
"pull-up" to the regulated power supply of 5.5V.
• The output ground circuit may be connected to any
COM
terminal.
• Do not use JUMPER if operating from a battery; it
will cause significantly increased system current
consumption.
• CAUTION: Only use JUMPER when the receiving
equipment has a active-drive input with 5V or less.
COM
All COM terminals are internally connected and may
be used either as NEGATIVE power supply terminals
or return terminals for any inputs or outputs.
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