Brooks Instrument SLA5810/20 - Manual (Page 18)

2-4
Section 2 Installation
Models SLA5810 and SLA5820
Installation and Operation Manual
X-PR-SLA5800-PC-eng
Part Number: 541B091AAG
July, 2010
2-10 Electrical Interface
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 device
includes +13.5 - 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)
• +15 or +24 Vdc Supply
• Setpoint Input (Voltage or Current)
• Setpoint Common
• Supply Common
• Chassis Ground (via unit body)
Refer to Figure 2-1 for pin connections
Refer to Figures 2-2, 2-3 and 2-4 for electrical I/O connections
(The Brook’s Pressure Controller 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 Pressure Controller 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.)