Brooks Instrument Mfi Series - Manual (Page 27)

2-9
Brooks ® Mf Series
Section 2 Installation Installation and Operation Manual
X-TMF-Mfi-Mfx-eng
Part Number: 541B074AAG
August, 2009
2-11 Configuring PC Board
Note: To obtain access to the jumpers, the electronics housing must be
removed. Remove the cover from the electronics housing by loosening the
four (4) self retained screws in the corner of the top cover. Disconnect
power to the mass flow controller/meter, unplug Terminal Strips TB-1 and
TB-2, and disconnect valve coil wire TB-3. Loosen the four (4) screws in
the corner of the housing body using a long (6 inch) 3 mm hex wrench. Lift
the housing off the circuit board. The can must be replaced before
returning the unit to service.
Refer to Section 2-9 for the proper electrical hookup. Refer to Figure 3-5
for PC board jumper locations and functions.
Setpoint (Command) Input
The mass flow controller can be configured for voltage or current setpoint
(command) input. Jumper J7 must be in the right hand position for 0-5 Vdc
setpoint and in the left-hand position for a 4-20 mAdc setpoint input.
Signal Output
A 0-5 Vdc flow signal output is always available. The current signal output
is jumper selectable for either 0-20 mAdc or 4-20 mAdc. Jumpers J3 and
J4 must be in the upper position for 0-20 mAdc output and in the lower
position for 4-20 mAdc output.
Note: Both J3 and J4 must be in the same position. Jumpers J3 and J4 do
not affect the voltage output.
Soft Start
To enable soft start, place Jumper J2 in the right-hand position (SS). To
disable soft start, place jumper J2 in the left hand position (N).
Chassis Ground
Connect earth ground to TB-2, Terminal 2.
Valve Override - Controller Only (connection optional)
The valve override function allows full opening and closing of the valve
independent of the setpoint:
• To open the valve, apply voltage (15-24) Vdc to TB-2, Terminal 5.
• To close the valve, connection TB-2, Terminal 5 to power supply
common.
• Floating TB-2, Terminal 5 (no connection) returns the controller to
normal operation.
Note: For normal operation, TB-2, Terminal 5 should be left open (floating).