Wiring diagram – Bray 52 Series User Manual

Page 19

BRAY Series 52 Valve Status Monitor

Operation and Maintenance Manual

• The residual Off-state Current of the DC S52 (specified as: 20 μA) is below the Off-State Current Max.

of the Input Card (specified as: 1.5mA). Note: this means that the leakage current of the S52 will not
cause false readings.

• The Nominal Impedance of the Input Card (specified as: 3kΩ) is sufficient enough to limit the current

flowing through the proximity switch below its Max. Switching Current (specified as: 200mA).

Ohm’s Law: V = IR (V = Voltage, I = Current, R = Resistance*)

24VDC = I x 3 KΩ

24/3000 = .008 A or 8 mA

This value is the amount of current that will flow through the S52 in the On-State (when the target is
in proximity of the sensor). This value, 8 mA, is below the Max. Switching Current of the S52 (cur-
rent exceeding 200mA can damage the device) and above the Min. On-State Input Current of the input
module (specified as: 2mA). *Note: Resistance in this case is referred to as Input Impedance

Once you have determined the compatibility of the two devices; you can wire the two devices together
using their appropriate wiring diagrams. The diagram in Figure 5 below shows you how to do this cor-
rectly.

Note: Each proximity switch in the S52 will require a separate input into the PLC card; thus, (1) S52 will

utilize (2) inputs into the PLC Input Module. One input for ‘Valve Open’ indication and one for ‘Valve

Close’ indication. Because this specific input module only has 6 inputs, three S52s can be wired into this

device. The number of necessary modules grows quite rapidly when you have several devices in use; this

is why fieldbus capable versions can be so cost effective, for more information please see the fieldbus ap-

plication example.

FIELD WIRING TO PLC

AND 24 VDC SUPPLY

S52 VALVE STATUS

MONITOR

24 Vdc

PIN 1

PIN 2

PIN 4

PIN 3

PNP

WIRING DIAGRAM

IN 0

IN 1

COM

LOAD 2

LOAD 1

Figure 5: Wiring diagram showing how to wire a DC PNP S52 to an

Allen Bradley Model # 1769-IQ6XOW4 DC Input Module.