Brooks Instrument 5851EM - Manual (Page 24)

2-10
Brooks ® Models 5965, 5851EM
Section 2 Installation Installation and Operation Manual
X-TMF-5965-5851EM-MFC-eng
Part Number: 541B122AAG
September, 2009
Electrical Hookup (Current I/O Option)
Setpoint (Command) lnput
The Model 5965/5851EM Mass Flow Controller can be used with a current
(4-20 mAdc) or voltage (0-5 Vdc) setpoint. To use the current setpoint,
connect the setpoint (+) signalto Pin 7 and the setpoint return (-) signal to
Pin 1 of the D-Connector and configure the PC board per Section 2-10.To
use the voltage setpoint, connect the voltage signal to Pin 9 and the
voltage setpoint return to Pin 1 of the D-Connector and configure the PC
board per Section 2-10.
SignalOutput
The flow signal output can be measured as a voltage and a current
simultaneously on two different pins of the D-Connector. Pin 2 indicates
the flowrate with a 0-5 Vdc signal proportional to the mass flow rate. Pin 4
indicates the flowrate with either a 0-20 mAdc or 4-20 mAdc current signal
as determined by jumpers on the PC board (refer to Section 2-T for jumper
positions). Both the current and voltage signals are returned on Pin 10 of
the D-Connector.
Supply
The power for the mass flow controller is connected to Pin 5 (+22.5 to +28
Vdc) and Pin 9 (supply common) of the D-Connector. Refer to Section 1-3
for the power requirements.
Chassis Ground
Connect earth ground to pin 14 of the D-Connector.
Valve Override (connection optional)
The valve override function allows full opening and closing of the valve
independent of the setpoint:
• To open the valve, apply +22.5 to +2g Vdc to. pin 12
• To close the valve, connect pin 12 to ground
• lsolating Pin 12 (no connection) returns the controller to normal
operation.
Note: For normal operation, pin 12 must be left open (floating).
2-11 Configuring the PC Board
Note:To obtain access to the jumpers, the electronics cover can must be
removed. Disconnect the power to the mass flow controller and cables to
the D-Connector and the valve coil connector. Remove the three screws at
the base of the can and remove the top jack post of the D-connector.
Remove the can. The can must be replaced before returning the unit to
service. Refer to Section 2-6 for the proper electrical hookup. Refer to
Figure 3-3 through 3-5 for PC board jumper locations and functions.