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AUTOMATION & PROCESS TECHNOLOGIES

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Once the LDT has been installed, wiring connections

can be made. The VMAX has four different connector

options. Please refer to the part number label to help

identify which wiring diagram is correct. There are two

groups of connections that will need to be made. They

are as follows:

• Power Supply Connections

(including grounding and shielding)

• LDT Input/Output Connections

Power Supply/Ground Connections

The 953A VMAX is available with many different con-

nector/wiring options. Refer to part numbering on unit

in question for proper wiring. See Appendex B for part

numbering grid and fiqures 3.3 - 3.9 for wiring details.

Connector option S is an industry standard 5 pin

12mm Euro style cordset with a shield. Option B is an

8 pin DIN with a shield, and option M is a 6 pin DIN

with a shield. To reduce electrical noise, the shield

must be properly used. Connect the cable’s shield to

the controller system GND. The cable shield is NOT

connected at the transducer rod. Always observe

proper grounding techniques such as single point

grounding and isolating high voltage (i.e. 120/240

VAC) from low voltage (7-30 VDC cables).

WARNING: Do not use molded cordsets

with LEDs!

It is preferable that the cable between the LDT and

the interface device be one continuous run. If you are

using a junction box, it is highly recommended that the

splice junction box be free of AC and/or DC transient-

producing lines. The shield should be carried through

the splice and terminated at the interface device end.

NOTE: When grounding the LDT, a single earth

ground should be connected to the Power Supply

Common (circuit ground). The LDT Power Supply

Common should be connected to the Power Supply

Common (-) terminal. The LDT power supply (+VDC)

should be connected to the power supply positive

Chapter 3: Wiring

terminal (+). The LDT cable shield should be tied to

earth ground at the power supply. The LDT analog

common should not be connected to earth ground and

should be used for connection to interface devices

only. For assistance, refer to your LDT’s wiring drawing

in this chapter.

In order for the VMAX to operate properly, the external

power supply must provide a voltage between 7-30

VDC. The power supply must be rated at one watt

minimum. The power supply should provide less than

1% ripple with 10% regulation.

The power supply should be dedicated to the

VMAX to prevent noise and external loads from

affecting it. When powering up more than one

VMAX on a single power supply, each unit will draw

approximately one watt.

3.1: V0/V1 (Voltage)

The LDT generates a voltage output based on position.

The 953 VMAX offers 16 Bits of resolution, and is

fully programmable over the entire active stroke

length. Keep in mind that there is a 2” Null Zone at the

connector end of the LDT and a 2.5” Dead Band at the

other end of the LDT that the magnet must stay out

of at all times. The units come fully programmed from

the factory and do not require re-programming unless

desired.

The analog output is referenced to the analog common

terminal and should not be referenced to any of the

other common terminals. For wiring, see Figure 3-2.

For programming Zero and Span, See Section 3.3.

3.2: C4/C2 (Current)

The LDT generates a current output based on position.

The 953 VMAX offers 16 Bits of resolution, and is fully

programmable over the entire active stroke length of

the LDT. Keep in mind that there is a 2” Null Zone at

the connector end of the LDT and a 2.5” Dead Band at

the other end of the LDT that the magnet must stay out

of at all times. The units come fully programmed from

the factory and do not require re-programming unless

desired.

Figure 3-1: Power Supply Wiring

Pin 1 (brown)

Pin 3 (blue)

Single ended

power supply

7-30 VDC

+

COM

WARNING: Do not

route the VMAX

cable near high

voltage sources.

!

!

Diagnostic LED

LED Color Description

None

No power to LDT

Green

Magnet signal detected and within programmed

range.

Yellow

Magnet signal detected, but magnet is outside of

programmed range.

NOTE: Magnet can be programmed in this range

if desired.

Red

No magnet signal detected. Make sure magnet

is on the rod and within the active area. Move

magnet back into the range and cycle power.