Brooks Instrument SLA5810/20 - Manual (Page 24)

3-4
Section 3 Operation
Models SLA5810 and SLA5820
Installation and Operation Manual
X-PR-SLA5800-PC-eng
Part Number: 541B091AAG
July, 2010
3-4 Analog I/O Mode of Operation
The following paragraphs describe the basic features of the Brooks Digital
Series Pressure Controllers.
NOTE: Read Section 3-3, Features, before reading this section. See
DeviceNet Supplemental Instruction Manual for specific details on
communication features.
A. Functional Description
The analog interface may include any of the following I/O options as
specified by the user:
0 - 5 Vdc setpoint, 0 - 5 Vdc flow output
1 - 5 Vdc setpoint, 1 - 5 Vdc flow Output
0 - 20 mA setpoint, 0 - 20 mA flow output
4 - 20 mA setpoint, 4 - 20 mA flow output
Also included are the Valve Override input and Calibration Select input
pins. All analog signals available are on the 15 pin D-Connector. (See Fig.
2-1 for connections). Note that one formerly unused connector pin, Pin 13,
now allows selection of up to ten separate calibrations. The contents of the
ten calibrations are determined from the customer order. Only those
calibrations ordered will be available in the instrument. Unless otherwise
specified, a Brooks Digital PC ordered with only one calibration will have
that calibration stored in calibration #1.
Before operating the PC, apply power and warm-up the instrument for
approximately 15 minutes. After warm-up, apply gas pressure then
proceed by following the instructions in the following sections.
B. Analog I/O Setpoint (MFC Only)
This input allows the user to establish the PC setpoint,. Several input types
are available as follows:
C. Analog I/O Flow Signal
This output is used to indicate the flow signal. A negative flow signal
indicates reverse flow through the device, but is NOT calibrated.
Several flow signal types are available:
D. Valve Override
This allows the valve to be forced to its most closed state or its most
open state, regardless of setpoint. If this input is not electrically connected
the PC will operate according to the current values of the other PC inputs.
If this input is held at 0 Vdc or -15 Vdc the value will be forced to its most
closed state. If this input is held at +15 Vdc or greater (max. = 24 Vdc).
Anolog I/O Type Full Scale Minimum Signal Maximum Signal
0 to 5 Vdc 5 Vdc -0.5 V 5.5 Vdc = 110%
1 to 5 Vdc 5 Vdc 0.5 V 5.5 Vdc = 111%
0 to 20 mA 20 mA 0 mA 22 mA = 110%
4 to 20 mA 20 mA 3.8 mA 22 mA = 111%
Setpoint Signal Type Full Scale Minimum Signal Maximum Signal
0 to 5 Vdc 5 Vdc 0 V 5.5 Vdc = 110%
1 to 5 Vdc 5 Vdc 1 V 5.5 Vdc = 111%
0 to 20 mA 20 mA 0 mA 22 mA = 110%
4 to 20 mA 20 mA 4 mA 22 mA = 111%