Brooks Instrument 5851E - Manual (Page 19)

2-9
Brooks ® Model 5851E
Section 2 Installation Installation and Operation Manual
X-TMF-5851E-MFC-eng
Part Number: 541B104AAG
November, 2008
desired set point. The control circuitry is reverse acting, e.g. for an
increase in transducer output the flow will correspondingly be decreased.
2-11 Valve Test Point
Refer to Figures 2-2, 2-3, and 2-4. The valve voltage can be monitored on
Pin D of the Card Edge version and Pin 7 of the D-Connector version. This
voltage relative to circuit common is approximately proportional to the valve
voltage per the following equation when using 15 V valve drive:
Valve Voltage = 1.95 x TP3 + 33.4 V
The Model 5851E does not have a purge feature. Do not ground Pin D of
the Card Edge version or Pin 7 of the D-Connector version.
2-12 Valve Off
Refer to Figures 2-2, 2-3, and 2-4. The control valve can be forced closed
regardless of command input signal by applying a TTL level low (<0.4 Vdc)
to Terminal L of the Card Edge version or Pin 4 of the Terminal L of the
Card Edge version or Pin 4 of the D-Connector version. A TTL level high or
floating at this pin has no effect.
2-13 Five Volt Reference Out/Valve Drive Configuration
A. Card Edge
Refer to Figures 2-3 and 3-3. Terminal 10 can be jumper selected
as 5 Volt reference output or "not used". The 5 Volt reference output is
required by older Brooks secondary electronics (Ex. Model 5896), or if
a potentiometer is to be used to generate the command signal. To
enable the 5 Volt reference output on Terminal 10 place the Jumper J8
in the D-E position. To disable the 5 Volt reference output place Jumper
J8 in the E-F position.
Do not ground Terminal 10 when 5 Volt reference output is enabled.
Irreparable damage to the PC Board may result.
CAUTION
To enable the Model 5851E to operate satisfactorily with the larger
orifice size used for higher flow rates, the P.C. board must be jumper
configured for a high voltage valve drive. For Model 5851E, Jumper J3,
must be in the A-B (left most) position.
B. D-Connector
Refer to Figures 2-4 and 3-4. The 5 Volt reference is always available
on Pin 11.
To enable the Model 5851E to operate satisfactorily with the larger
orifice size used for higher flow rates, the P.C. board must be jumper
configured for a high voltage valve drive. For the Model 5851E Jumper
J3 must be in the A-B (left most) position.