3-14
Brooks
®
Models 5964, 5850EM
Section 3 Operation
Installation and Operation Manual
X-TMF-5964-5850EM-MFC-eng
Part Number: 541B121AHG
November, 2008
Valve Off
This feature allows the user to close the control valve by supplying a TTL
level low signal (<0.4 Vdc) to the proper terminal, independently of the
command input. A TTL level high or floating at this pin has no effect. Valve
off is accessed via Pin L on the Card Edge or Pin 4 on the D-Connector
version.
Note: Valve off is not available on Current I/O versions.
Remote Transducer Input
This feature allows the use of the integral control electronics and valve to
regulate flow in response to signal from an external 0-5 Vdc signal. The
flow signal from the Model 5964/5850EM is still available for process
monitoring. This feature is only available on standard response versions.
The external signal is applied to Pin 5 on the Card Edge version or Pin 15
D-Connector. The input signal is selected by the J7 green jumper. Refer to
Figure 3-6 or 3-8 as applicable for jumper configurations.
Low Command Flow Cutoff (Auto Shut-Off)
Prevents the valve from opening whenever the command input is less than
2% of full scale. This function is always active and is present on all
versions.
Output Limiting
Prevents possible damage to delicate data acquisition devices by limiting
the output to +6.8 Vdc and -.7 Vdc (0 to 26 mA with the Current I/O
Option).
Current I/O Version
(Refer to Figures 2-4, 2-5, 2-6 and 3-9)
a. Input Signal Selection
To use the current command, connect the command signal (+) to Pin 7
of the D-Connector and the command return (-) to Pin 1 of the
D-Connector. Configure the J7 green jumper in the left position.
To use the voltage command, connect the command signal (+) to Pin 8
and the command return (-) to Pin 1 of the D-Connector. Configure the
J7 green jumper in the right position.
b. Output Signal Selection
To use the current output, connect the output (+) signal to Pin 4 of the
D-Connector and the output return (-) to Pin 10. The current output
range is jumper selectable from 4-20 mA or 0-20 mA using the J3 and
J4 blue jumpers. The 0-5 Vdc output signal is always enabled on Pin 2.
