Brooks Instrument 5850E - Manual (Page 17)

Brooks ® Model 5850E
2-7
Section 2 Installation Installation and Operation Manual
X-TMF-5850E-MFC-eng
Part Number: 541B102AAG
September, 2009
For installations which replace Unit Instruments UFC-1000's, (Card Edge
version) Pin 10 is frequently grounded. In these situations the 5 Volt
reference output must be disabled. Refer to Section 2-12.
For installations which will be connected to Brooks secondary electronics,
the Card Edge version must have the 5 Volt reference enabled on Pin 10
and the D-Connector version should be configured for external valve
return. Refer to Section 2-12. If the Model 5850E was shipped as a
system with Brooks secondary electronics then the electronics will already
be configured properly.
Note: To obtain access to the jumpers for the following options the
electronics cover can must be removed. Remove the can by removing the
three screws and the valve connector. The can must be replaced before
returning the unit to service.
2-7 Soft Start
Refer to Figures 3-3 and 3-4. To enable soft start, place the red jumper on
the controller printed circuit board at J2 in the (ss) position.
To disable soft start, place the red jumper on the controller printed circuit
board at J2 in the (n) position.
2-8 Remote Setpoint (Command) Input
If the mass flow controller is to be commanded by an external 0-5 Vdc
signal, the command potentiometer is not used.
The command input hookup is as follows:
a. Card Edge Connector
Connect the external command voltage to Terminal A and external
command return to Terminal B. Refer to Figures 2-2 and 2-3.
b. D-Connector
Connect the external command voltage to Terminal 8 and external
command return to Terminal 1. Refer to Figure 2-4.
2-9 Valve Override
The valve override function allows full opening and closing of the valve
independent of the command setting. The unique command reset feature
prevents flow overshoot when the controller goes from valve override
closed to normal control. The valve override for the mass flow controller is
as follows:
a. To open the valve, apply +15 Vdc to the valve override terminal.
b. To close the valve, apply -15 Vdc to the valve override terminal.