2-5
SLA7900 Series
Installation and Operation Manual
X-TMF-SLA7900-MFC-eng
Part Number: 541B022AAG
August, 2009
Section 2 Installation
2-10 Electrical Interface (Analog I/O)
The setpoint signal is supplied as a 0(1) to 5 Vdc or 0(4)-20 mA analog
signal. All signals are supplied via the 15-pin D-Connector. For an analog
unit the minimum set of connections which must be made to the MFC and
MFM in13.5 - 27 Vdc, supply common, and a setpoint signal.
The Brooks Digital electrical interface is designed to facilitate
low-loss, quiet signal connections. Separate returns (commons) are
supplied for the analog setpoint, analog flow signal, and the power supply.
These commons are electrically connected together on the PC board.
Analog I/O Versions
• Signal Common
• Signal Output (Voltage or Current)
• +13.5 - 27 Vdc Supply
• Setpoint Input (Voltage or Current)
• Setpoint Common
• Supply Common
• Chassis Ground (via unit body)
Refer to Section 1 for pin connections
Refer to Figures 2-1, 2-2, 2-3, 2-4, 2-5, 2-6 and 2-7 for electrical I/O
connections
(The Brook’s MFC acts as a current sink to a setpoint input signal. The 0/4-
20 mA setpoint signal should be “driven” into the MFC input by a controlled
current source. Reference Brook’s device specifications for the setpoint
input impedance.)
(
The Brook’s MFC acts as the current source when providing a 0/4-20 mA
output signal to the load. The output signal is “driven” by the MFC into the
customer load. Reference Brook’s device specifications for maximum load
capacity.)
The Brooks (electric/electronic) equipment bearing the CE mark
has been successfully tested to the regulations of the Electro
Magnetic Compatibility (EMC directive 89/336/EEC). Special
attention is required when selecting the signal cable to be used
with CE marked equipment.
Brooks supplies high quality cables which meet the
specifications for CE certification. If you provide your own signal
cable you should use a cable which is completely screened with a
100% shield. D-Connectors should also be shielded using a metal
shield. If applicable, metal cable glands must be used to provide
cable screen clamping. The cable screen should be connected to
the metal shell or gland and shielded at both ends over 360
degrees. The shield should be terminated to an earth ground. See
Appendix A for CE Certification of Mass Flow Equipment.
NOTICE
