EN 6 7000 SERIES INDICATORS

1.11.4 SD Memory Option

An optional SD Memory card provides a medium on which to store files such as Alibi memory, IDs in the counting application and target weights in the checkweighing application.

Note: The SD card is required for alibi memory.

The SD memory can also be used to extract and save the configuration and calibration settings of the terminal.

These can then be restored to the terminal or loaded to a different terminal. This feature can be used to clone the setup of one terminal then transfer it to other units, which minimizes the chance of error in setting up a new configuration.

1.12 Installation

Opening the Enclosure

The front panel of the harsh enclosure T72XW terminal is locked in place by six spring clips attached to the body of the enclosure. To access the termin al’s PCB to install options, connect internal wiring and set switches, separate the front panel from the enclosure as follows:

1. Insert the tip of a flat-blade screwdriver into one of the two slots located on the bottom of the front panel assembly

(see Figure 1-2). While squeezing the front panel and enclosure together, gently push the screwdriver in toward

the enclosure. A “pop” sound is made when the cover clip is released.

Figure 1-2: Opening the Harsh Enclosure

2.

Repeat Step 1 for the other slot.

3.

After releasing the two clips securing the bottom of the front panel, move the panel to each side to disengage

the side clips, then lift the bottom of the front panel firmly up and out (Figure 1-, 1) until it completely clears the

top edge of the bottom enclosure.

4.

Squeeze the top of the front panel to the enclosure along the top edge slightly and push upward (Figure 1-, 2)

to unsnap the top two clips, then lift the cover to clear the two top clips. The cover will swing down, hinged by two wire cables at the bottom.

2

1

Figure 1-3: Removing the Cover

7000 SERIES INDICATORS

Installing Cables and Connectors

EN 7

Information for installing cables and connectors for the T72XW terminal is provided in this section, including:



Ferrite Core



Main Board Wiring Connections



Wiring Connections for Options



Ferrite Core

In order to meet certain electrical noise emission limits and to protect the T72XW from external influences, it is necessary to install a ferrite core on the load cell cable connected to the terminal. The ferrite core is included with the basic terminal.

To install the ferrite, simply route the cable through the center of the core and then take one wrap around the outside of the core and route the cable through the center again. Either the complete cable or the individual wires

can be wrapped through the ferrite. This should be done as close to the enclosure as possible. See Figure 1-.

Figure 1-4: Installing the Ferrite Core

Main Board Wiring Connections

Once the T72XW terminal harsh enclosure is open, connections can be made to the terminal strips on the main

board, as shown in Figure 1-.

Load cell connector

Option 1 connector

Option 2 connector

AC power connecto

DIP switches

Figure 1-5: T72XW Main Board Connections, AC Model

Analog Load Cell Connections

WARNING!

TO AVOID DAMAGE TO THE PCB OR LOAD CELL, REMOVE POWER FROM THE

T72XW TERMINAL AND WAIT AT LEAST 30 SECONDS BEFORE CONNECTING OR

DISCONNECTING ANY HARNESS.

EN 8 7000 SERIES INDICATORS

Load cell connections are made to the load cell connector located on the main board as shown in Figure

1-.

The AC version of the T72XW terminal is designed to power up to ten 350-ohm load cells (or a minimum resistance of approximately 35 ohms). The battery version of the T72XW terminal is designed to power up to four 350-ohm load cells (or a minimum resistance of approximately 87 ohms). To confirm that the load cell load for this installation is within limits, the total scale resistance (TSR) must be calculated. To calculate TSR:

TSR =

Load Cell Input Resistance (Ohms)

Number of Load Cells

Ensure that the TSR of the load cell network to be connected to the T72XW has a resistance greater than the minimums listed above before connecting the load cells. If the resistance is below the minimum, the T72XW will not operate properly.

In addition, the maximum cable distance must be reviewed. Table 1-4 provides recommended maximum cable

lengths based on TSR and cable gauge.

Table 1-4: Recommended Maximum Cable Lengths

TSR (Ohms)

350

87 (4-350



cells)

43 (8-350



cells)

35 (10-350



cells)

24 Gauge

(meters/feet)

243/800

60/200

30/100

24/80

20 Gauge

(meters/feet)

610/2000

182/600

91/300

60/200

16 Gauge

(meters/feet)

1219/4000

304/1000

152/500

120/400

The T72XW terminal is designed to support both 2mV/V and 3mV/V load cells from the same circuitry. A load cell output rating selection jumper is not required.

Figure 1-2 shows the terminal definitions for the analog load cell terminal strip. Note that when using four-wire load

cells, jumpers must be placed between the +Excitation and +Sense terminals and between the



Excitation and



Sense terminals.

Figure 1-2: Load Cell Termination

Note: For the standard four-wire cable: If an increase in load results in a decrease in weight display, reverse the signal wires (+SIG and



SIG)

7000 SERIES INDICATORS

COM1 Serial Port Connections

The COM1 port provides an RS-232 connection for external serial devices. Figure 1-3 indicates which terminal

carries which signal on the COM1 port. Make the connections as necessary.

EN 9

Terminal

TxD

RxD

Gnd

Signal

Transmit RS-232

Receive RS-232

Logic Ground

Figure 1-3: COM1 Port Signals

An example of connecting via RS-232 to external equipment is shown in Figure 1-4. Make the connections as

necessary.

NOTES:

1. USE ONLY SHIELDED CABLE.

2. MAXIMUM CABLE LENGTH: 50 FEET (15 METERS).

3. WIRE SIZE: 18 AWG (.823 mm

2

24 AWG (0.205 mm

) MAXIMUM

2

) MINIMUM.

Figure 1-4: Sample COM1 Connections

PCB Switch Settings

PCB switch settings are described in this section, including settings for main PCB switches and the discrete I/O switch

.

Main PCB Switches

A six position switch block (Figure 1-5) is located on the main PCB. These switches function as shown in

Table 1-5.

Figure 1-5: Location of Switch Block 1 on the Main PCB

EN 10 7000 SERIES INDICATORS

Table 1-5: Switch 1 Functions

Switch

SW1-1

SW1-2

Functions

Metrology Security Switch (legal for trade)

When in the ON position, this switch prohibits changes to metrological parameters in setup. This must be ON for

“approved” applications

Master Reset

Set in the ON position and power cycle to perform a master reset of all data in the terminal

Set in the OFF position during normal operation.

Notes

This is true even if the Scale

Approval parameter is selected as “None” in setup.

When a Master Reset is performed, set SW1-4 to ON to reset metrologically significant data, such as scale calibration,

GEO code, etc.

SW1-3

SW1-4

Flash Software

Set in the ON position for software download

Set in the OFF position during normal operation

Reset Calibration

Set in the ON position to reset calibration during a master reset

Set in the OFF position to retain current calibration values during a master reset

Not used

Works with switch SW1-2

SW1-5

SW1-6 Not used

When both SW1-2 and SW1-4 are positioned ON and AC power is applied to the terminal, a Master Reset function will be initiated. This procedure will erase all programming in the terminal and return all settings back to factory default values. This process is described in the T72XW Technical Manual, Chapter 4, Service and Maintenance.

SD Card Installation

The SD memory card can be used for additional storage in the Checkweighing and Counting applications, and

must be installed if the Vehicle Application is used. Figure 1-6 shows the installation of an SD card into the socket

on the edge of the T72XW main board.

Figure 1-6: Sliding an SD Card into the SD Socket (left); SD Card Installed (right)

Capacity Label Instructions

The regulations in some locations require that the scale capacity and increment be shown on the front of the terminal, near the display. To satisfy this requirement, a blue capacity label is included with the terminal that must be completed and adhered to the front overlay.

The capacity label (shown in

Figure 1-7) provides space for the Max, min, and e information for both ranges for which the scale is programmed.

If only one range is used, the unused portion of the label may be cut off with scissors. Written information must be legible and a minimum of 2mm or 0.08 in. in height. A permanent marker should be used for this information.

Figure 1-7: Preparing the Capacity Label

7000 SERIES INDICATORS EN 11

Clean any oil or other contaminants from the area of the overlay shown in Figure 1-8 where the capacity label will be added. Peel the backing from the label and adhere it to the overlay in the location shown in Figure 1-8, or

another location acceptable to the local regulations.

Capacity Label in

Place

Figure 1-8: Capacity Label Installed

Closing the Enclosure

After all work has been completed inside the terminal, the enclosure must be snapped shut properly to maintain its environmental integrity.

To properly close the terminal, follow these steps:

1.

Position the front cover over the rear housing then gently press it down into place.

2.

Press down firmly in each of the four corners of the front cover in sequence until each corner clip snaps audibly snaps into place.

3.

It is very important that each of the 4 corner clips have snapped into place. When pressing down on the cover during installation, listen for the “click” sound of each clip engaging.

Securing the Enclosure

When the T72XW terminal is used in a metrologically “approved” application, it must be protected from tampering by use of a seal. A wire security seal is included with the terminal.

For sealing details of the T72XW terminal, refer to Figure 1-9 and follow these steps:

1.

Ensure that the appropriate approval region has been selected in setup under Scale > Type > Approval, and

that the Metrology security switch SW1-1 is in its ON position (refer to Figure 1-5 and

2.

3.

Table 1-5).

4.

With the front panel installed on the enclosure and snapped into place, thread the free end of the wire seal through either the left or right hole in the T72XW front panel, and through the hole in the retaining clip.

5.

Thread the end of the wire cable through the hole in the plastic seal (as shown in Figure 1-9), remove any

remaining slack in the wire, and snap the seal shut.

Sealing wire threaded through hole and clip

Sealing wire threaded through plastic seal

Figure 1-9: Seal Threaded and Ready to be Closed