Sartorius PMA7500 Manuel utilisateur

WPM5003-e98061

Sartorius PMA7500...

Electronic Paint Mixing Scales

Service Manual for PMA7500... Models

incl. Spare Parts List and Service Specifications

Sartorius AG, Weighing Technology

Page

General Information 4

Overview of Models 4

Differences to former PMA Versions 4

Auxiliary Service Tools and Equipment 4

Accompanying Literature 4

Operating the Scale 5

Function of Keys 5

Scale Operating Menu 5

Accessing the Scale Operating Menu and Changing the Settings 5

Exiting the Scale Operating Menu with or without Storing the New Settings 6

Activating the BPI Mode 6

Calibrating/Adjusting the Scale 7

Calibration/Adjustment Sequence 7

Zero-Point Offset Value 7

Off-Center Load 8

Linearity 8

Span Adjustment 8

Replacing PCBs 9

Replacing the Main PCB 9

Opening the Scale 9

Replacing the Display PCB 10

Replacing the Strain-Gauge Load Cell 10

Error Messages 11

Overview of the Scale Operating Menu 12

Service Specifications 13

Spare Parts List 14

Contents

General Information

Important: Prerequisites for working on the Sartorius PMA Scales include considerable

experience, completion of a Service Course at the Training Center in

Goettingen, and the special tools and equipment described below. Please

do not attempt or permit any unauthorized repair work!

If you remove the seal (warranty sticker), the scale is no longer covered

under the warranty.

Overview of Models

The Sartorius PMA7500... models are available in different versions:

PMA7500 Standard model

...D... Dual Range Resolution (0g - 800g = 0,05g resolution,

>800g = 0,1g resolutiuon)

...X... EX proof version

...C with recalculation application (display head with 4 additional

keys)

Models

PMA7500, PMA7500D-000AM, PMA7500-000C, PMA7500-000W,

PMA7500-X, PMA7500-X00AM, PMA7500-X00C, PMA7500-X00W.

PMA7500D, PMA7500D-000AM, PMA7500D-000C, PMA7500D-000W,

PMA7500D-X, PMA7500D-X00AM, PMA7500D-X00C,

PMA7500D-X00W.

PMA7500D-X00CV1 (USA)

Differences to former PMA Versions

– new design

– new electronics

– higher capacity

– "Dual Range" resolution

Auxiliary Service Tools and Equipment

You will need the service software for adjusting overload stops, linearity and

span adjustment if the error in any of these adjustments is > 2%, and for

resetting the display and control unit after replacing one or more PCBs.

In addition to standard tools, you will need the following special tools:

Qty. Designation Order no.

1 Sartorius service software, version 1.33 or later 6740-33

1 PSION Server, complete, version 4.6 or later 6739-98

1 RS 232 cable for connecting the scale to PC 7357 312

1 BPI-mode adapter 6740-63

Accompanying Literature

Installation and Operating Instructions for PMA7500... scales

SARTORIUS PMA 7500...

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Operating the Scale

Function of Keys

eOn/off. The scale remains in the standby mode.

=Tare / Zero key (display is set to 0,0 g)

wToggle. Toggles the display between weight and

calculated value; also for changing Reference

sample quantity/reference percentage/ numbers

of subweighing operations.

vFunktion key (start application program)

cClear function key, Used to interrupt/cancel functions, delete input.

YCurser key up

yCurser key down

Recalculations key (start recalculation program)

Memory key (store values)

Scale Operating Menu

Accessing the Scale Operating Menu and Changing the Settings

– Press eto turn the scale off and press again to turn it back on.

– Press =briefly while all segments are lit (self-test).

–“

1.1.

1.” is displayed.

Important: You can configure software settings to block access to the scale operating

menu (menu code: 8 1 2). If menu access is blocked, this is indicated by a

minus sign preceding the menu code number (e.g., ”- 1.- 1.

- 1.- 1.

- 1.” rather than “1.1.

1.1.

1.”).

To make the menu accessible, select the menu code 8 1 1 (the only menu

code that can be selected when menu access is blocked). This setting can be

changed again the next time you activate the scale operating menu.

Selecting a Menu Code

– To select a certain menu code, press =to change the number of the

digit displayed to the desired code number. Numbers change in a

cyclical sequence, starting at 1 again after 9 is reached.

– To select the next digit (menu level), press w

– Once the first 2 digits are selected, the entire 3-digit code setting is

displayed, with a small superscript “o” indicating that this is the current

setting.

– Press wto return to the higher menu level

Changing a Menu Code Setting

– Once you have selected the desired code setting as described above,

press wfor >2 seconds to confirm the setting.

– The superscript “o” is now displayed to indicate that this is the current

setting.

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Exiting the Scale Operating Menu with or without Storing the New Settings

– To exit the scale operating menu and store the new settings:

Press =for > 2 seconds.

– To exit the scale operating menu without storing any changes to the

settings: Press e.

Overview of the Scale Operating Menu Codes

See pages 12 for an overview of the scale operating menu codes.

Activating the BPI Mode

BPI = Binary Processor Interface (special Sartorius data transfer protocol)

SBI = Sartorius Balance Interface (RS-232 communication)

The scale must be in the BPI mode in order to use the CAS programs with the

MC-1 server (version 4.6 or later) or a personal computer (version 1.33 or

later). These programs are required especially for:

– adjusting linearity and/or span when the adjustment error is > 2%,

– replacing the main PCB.

Important: After working in the BPI mode, make sure to set the write-protect again

(using the “Close” function) so that the scale returns to the standard data

transfer protocol (SBI mode). Otherwise you will not be able to operate

peripheral devices with the scale; when pis pressed, the error code

“E 30E 30

E 30E 30

E 30” is displayed.

Procedure:

– Disconnect the equipment from the power supply

– Open the unit (see page 9)

– Re-connect the equipment to the power supply

– Plug in the mode adapter (6740-63)

The black protective cap points toward the outer edge of the scale.

Note: An incorrect postion has no affect to the scale.

– The scale now performs its self-test (display segment check) repeatedly.

Wait until the segment check has lit up at least 3 times; the scale is now in

BPI mode.

– Remove the mode adapter

– Close the scale housing (see page 9)

– You can now use the scale with the service software.

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SARTORIUS PMA 7500...

Calibrating/Adjusting the Scale

Calibration/Adjustment Sequence

Check and, if necessary, adjust the following factors:

1. Zero-point offset value

2. Off-center load

3. Linearity

4. Span adjustment

Zero-Point Offset Value

The zero-point offset value is necessary for adapting the bridge voltage of the

strain-gauge load cell to the operating range of the scale electronics.

This may be necessary:

– after replacing the strain-gauge system

– after replacing the main PCB

– if the span cannot be adjusted (even with the service software) and the

error code “E 02” is displayed

– when the zero-point offset voltage has changed and is outside the

tolerance limit (e.g., due to the strain-gauge load cell being “bent”)

Adjusting the Zero-Point Offset Value

Adjust the zero-point offset value using a digital voltmeter.

– Open the scale (see page9)

– Connect the cable from the digital voltmeter (DVM) to plug ST2, pins 1

and 2 (Pin 1: measuring voltage (OP output IC6 / pin 6), pin 2: ground)

– Replace the pan support on the scale and fasten it with the screws, place

the pan on the pan support and re-connect the scale to the power supply

– Use the DVM to check the preload voltage with no load on the scale:

Target (mV)

PCB installed at the factory -120 to -1,600

Replacement PCB (with menu access switch): -120 to -350

– Adjustment when the preload voltage does not equal the target:

Factory PCB: Check the strain-gauge load cell;

replace if necessary

Replacement PCB Solder or de-solder the bridges

(with menu access switch): on the main PCB as indicated below

Zero-Point Offset Voltage J5 J6 J7 J8 J9

< -580 mV Check the strain-gauge load cell; replace if nec.

-580 mV ... -350 mV open close open open open

-350 mV ... -100 mV open open open open close

-100 mV ...+120 mV open open open close open

+120 mV ...+360 mV open open close open close

> +360 mV Check the strain-gauge load cell; replace if nec.

– Check the zero-point offset voltage again; re-adjust if necessary

After the zero-point offset voltage is reset, the span must be adjusted (using

the service software, if necessary).

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Off-Center Load

Checking the Off-Center Load

– Center the test weight (see “Service Specifications,” page 13) on the pan

(position 1) and press =

“0.0” is displayed (depending on model and settings)

– Place the test weight on positions 2, 3, 4 and 5 in sequence

– The absolute values displayed for all 4 positions must be within the limits

listed in the service specifications (see page13)

– If the off-center load error exceeds the tolerance listed in the service

specifications in any of these 4 positions, the off-center load should be

adjusted with the greatest positive error value (see “Adjusting the Off-

Center Load” below)

Adjusting the Off-Center Load

– Remove the pan

– Remove the pan support from the strain-gauge load cell (2 Allen screws in

the lower part of the pan support) and place it to one side

– Correct the off-center load by filing on one of the thin parts. Always file

the thin part that corresponds to the greatest off-center load error.

– Place the pan support on the load cell and fasten it, align the pan support

arms approximately with the off-center load bolts, and place the pan on

the pan support.

– Check the off-center load (see “Checking the Off-Center Load” above)

and adjust if necessary

Linearity

Adjust the linearity using the service software

Please refer to the service software description.

Span Adjustment

Note: There are two ways to perform span adjustment:

1. As described in the manual

2. Using the service software

– Select the menu code “External adjustment accessible” (code 1 5 2)

– Unload the scale and, if necessary, press =to zero the display

– Press and hold the =key for >3 sec. to activate the calibration routine

– The weight value of the required calibration weight is displayed without

weight unit; e.g., “+ 5.000”

– Center the prompted weight on the pan (here: 5.000 kg)

Important: The scale will only accept a weight that is within a tolerance range of

approximately 2% of the nominal weight. Any greater error can only be

adjusted using the service software.

– After the adjustment procedure, the weight is displayed with weight unit

(e.g., “+ 5.000 kg”)

– Remove the calibration weight

– Check the span again and adjust it if necessary

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SARTORIUS PMA 7500...

Replacing PCBs

In the case of defects, do not attempt to make any repairs at the component

level, but replace the entire subassembly.

Replacing the Main PCB

Note: Before replacing the main PCB, use the service software to read out and store

the scale’s data record, if possible. If this is not possible, order a

pre-programmed PCB, indicating the scale model and serial number.

– Open the scale

– Disconnect the cables that lead to the strain-gauge load cell and the

display head.

– Remove the 3 Phillips screws and remove the old PCB

Important: Make sure the solder bridges on the new PCB are the same as those on the

old PCB; change the solder bridges on the new PCB if necessary. The menu

access switch on the new PCB must be in the “accessible” position; this is the

position when the switch is moved toward the outer edge of the PCB.

– Follow the above instructions in reverse order to install the new main PCB

– Activate the BPI mode, if necessary (see page 6)

Note: The scale must now be programmed with its individual data.

The following factors must be checked and, if necessary, adjusted:

– Zero-point offset value

– Linearity

– Span

Opening the Scale

– Disconnect the power supply

– Remove the pan

– Put the scale on one side

– Remove the 3 Phillips screws (A, B)

Important! When removing the screw (A) also the display support

is loose.

– Remove the plactic cover (C) and put it aside.

– Now the main PCB is accessible

– The scale is closed in revers order.

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Replacing the Display PCB

The display PCB must be replaced if:

– the display is defective

– data output is defective

When replacing the display PCB, replace the cable connecting the display

PCB to the main PCB at the same time.

– Open the scale (see page 9)

– Remove or cut the wire tie holding the cable that connects the electronics

module to the display and control unit

– Now the display head together with the suport arm can be removed

– Carefully remove the protective cap (A) using a proper tool

– Push the pin out of the support arm

– Now the defective display head together with the connecting cable can

be removed

– Follow the above instructions in reverse order to install the new PCB

Replacing the Strain-Gauge Load Cell

– Open the scale (see page 9)

– Unplug the load-cell cable from the main PCB

– Remove the two screws from the pan support and put it aside

– Remove the three screws that tighten the strain gauge load cell from the

underneath. now the defective strain gauge load cell can be removed.

– Place the new strain gauge load cell in the housing adjust its position and

tighten it again.

– Tighten the pan support again.

– Guide the connecting cable into the electronics module and plug the

cable into the main PCB

– Now the zero-point offset value the lineaity and the span need to be

checked / adjusted.

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