Sartorius PMA7500 User manual

WPM5003-e98061
Sartorius PMA7500...
Electronic Paint Mixing Scales
Service Manual for PMA7500... Models
incl. Spare Parts List and Service Specifications
Sartorius AG, Weighing Technology
F

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

4
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
or
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...
5
Vorein03.EPS
Vorein04.EPS
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.
1.1.
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.
Vorein01.EPS
Vorein02.EPS
Anz-rec.TIF
Anz-norm.TIF

6
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%,
or
– 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.
Vorein01.EPS
bpi-02d.TIF

SARTORIUS PMA 7500...
7
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).
Nullp-d.TIF

8
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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2
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SARTORIUS PMA 7500...
9
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.
oeffnen-d.TIF

10
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.
Kopf-01d.TIF

SARTORIUS PMA 7500...
11
Error Messages
Display Cause Solution
HScale capacity exceeded Unload the scale
LNo pan on the scale Place the pan on the scale
Something is touching the Remove whatever is touching
pan the pan
E 01 Display overflow; i.e., the value to Reduce the load on the scale
be output cannot be displayed
E 02 Calibration parameter not met; Only start calibration when zero
e.g.: is displayed
– scale not zeroed Press =to zero the scale
– load on scale Unload the scale
E 08 Scale is not within the zero range Scale can only be zeroed setting
within the zero-setting range
(± 2% of max. load)
E 09 Scale cannot be tared when the Press =to zero the scale
gross value is ≤0
E 10 =key is blocked when there is Press cto clear the 2nd tare
data stored in the 2nd tare memory memory
E 11 Value cannot be stored in the Press =
2nd tare memory
E 22 Weight too light, or no load Increase the weight on the scale
on the scale
E 30 pkey pressed while BPI mode Set the scale to the SBI mode
active (e.g., by activating the “Close”
function in the MC1 server)
E 50 Overflow or underflow in the TK sensor or main PCB is defective
temperature compensation converter (replacement required)
E 53 Temperature compensation converter TK sensor or main PCB is defective
is not functioning. The processor (replacement required)
is not receiving any measured data
from the TK switch
E 54 A/D converter output is below The scale is underloaded; either
the minimum limit the pan is not on the scale
or there is a mechanical defect
or a defect in the main PCB
E 55 A/D converter output is above the Either the scale is overloaded
maximum limit or there is a mechanical defect
or a defect in the main PCB

12
Overview of the Scale Operating Menu
1 Scale Functions
1 1 Ambient Conditions
1 1 1 Minimum vibration
1 1 2 Normal vibration
1 1 3 Strong vibration
1 1 4 Extreme vibration
1 2 Application Filter
1 2 1 Weighing
1 2 2 Filling mode
1 3 Stability Range
1 3 1 ¼ digit
1 3 2 ½ digit
1 3 3 1 digit
1 3 4 2 digits
1 3 5 4 digits
1 5 Calibration/Adjustment
1 5 1 Accessible
1 5 2 Blocked
1 6 Auto Zero
16 1 On
16 2 Off
1 7 Weight Unit 1
1 7 1 Grams o
1 7 2 Grams g
3 Application Parameters
3 1 Weight Unit 2
3 1 1 Grams o
3 1 2 Grams g
4 1 Recalculation Parameter
4 1 1 Total readout
4 1 2 Individual values
5 Interface
5 1 Baud rate
5 1 1 150 baud
5 1 2 300 baud
5 1 3 600 baud
5 1 4 1,200 baud
5 1 5 2,400 baud
5 1 6 4,800 baud
5 1 7 9,600 baud
5 2 Parity
5 2 1 Mark
5 2 2 Space
5 2 3 Odd
5 2 4 Even
5 3 Number of Stop Bits
53 1 1
53 2 2
5 4 Handshake Mode
5 4 1 Software handshake
5 4 2 Hardware handshake, 1 char. after
CTS
5 4 3 Hardware handshake, 2 char. after
CTS
6 Print in Weighing Mode
6 1 Manual/auto print mode
6 1 1 Manual without stability
6 1 2 Manual with stability
6 1 3 Automatic without stability
6 1 4 Automatic at stability
8 Extra Functions
8 1 Menu Access
8 1 1 Parameter settings can be changed
8 1 2 Read only
8 3 Power-on Mode
8 3 1 Off > on
8 3 2 Stand-by > on
9 Reset Menu
9 1 Factory Settings
9 – 1 Restore factory settings
9 – 2 Do not restore factory settings

SARTORIUS PMA 7500...
13
Service Specifications
Reproducebility Off-Center Load TCS
Model Weighing
Capacity Readability Test weight
Permissible
Tolerance
s
Test
weight
Permissible
Tolerance
(±) ppm/K
PMA 7500 ... 7500
g
0,1
g
5000
g
0,1
g
5000
g
0,6
g
10
PMA7500D ... 999,95
7500
g
0,05
0,1
g
5000
g
0,1
g
5000
g
0,1
g
10
Span Linearity
Model
Class
Adjustm.
weight Test weight
Permissible
Tolerance
(±)
Tare
weight
Test
weight Permissible Tolerance
(±)
PMA 7500 ... F2 5000 g 5000 g 0,1 g ––– g 1000/3000
5000/7000 g0,2g
PMA7500D ... F2 5000 g 5000 g 0,1 g ––– g 1000/3000
5000/7000 g0,2g
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14
Spare Part List
Ersatzteil Designation
PMA7500 PMA7500D PMA7500-000AM PMA7500D-000AM PMA7500-000C PMA7500D-00C PMA7500-000W PMA7500D-00W PMA7500-X PMA7500D-X PMA7500-X00AM PMA7500D-X00AM PMA7500-X00C PMA7500D-X00C PMA7500-X00CV1 PMA7500-X00W PMA7500D-X00W
609308-01 Ex-proof power supply 220V, A, CH, EU 1 1 1
609308-21 Ex-proof power supply 240V, GB 1 1 1
609308-4 Ex-proof power supply 240V, AUS, NZ 1 1 1
609308-6 Ex-proof power supply 110V, USA, CDN 1 1 1
6971172 Table
p
ower su
pp
l
y
, 230/115 V 1 1 1
6971173 Table power supply, 120 V 1 1 1
6971942 Table power supply, 240V, GB 1 1 1
6971410 Power supply STNG 6,240V, South Afrika 1 1 1
6971411 Power supply STNG 6, 240V, Australien 1 1 1
6971412 Power supply STNG 6, Europa, 230V 1 1 1
6971413 Power su
pp
l
y
STNG 6, USA/CDN, 120V 1 1 1
6971414 Power supply STNG 6, 240V, GB 1 1 1
69AM0021 Cable 1
69PM0051 Cable 1
69PM0044 Cable 1 1 1
69PM0048 Cable 1 1 1
69PM0045 Foil with key caps 1 1 1
69PM0035 Foil with key caps 1
69PM0036 Display head 1 1
69PM0046 Display head 1 1
69PM0047 Main PCB 1 1 1 1
69PM0039 Main PCB 1111
69LC0048 Plug 111111 1 1
69LC0084 Cap for data interface 1 1 1 1
69PM0012 Cap 1 1 1 1
69PM0013 Axle 1 1 1 1
69PM0037 Pan 111111 1 1
69PM0038 Strain gauge load cell 111111 1 1
69PM0040 Pan support 111111 1 1
69PM0041 Foot 111111 1 1
69PM0042 Display head support arm 1 1 1 1
69PM0043 Set of covers 1 1
69PM0049 Power socket, complete 1 1 1

SARTORIUS PMA 7500...
15

Printed in Germany on paper that has been bleached without any use of chlorine · D.A.· M
Publication No.: WPM5003-e98061
Copyright by Sartorius AG, Goettingen, Germany.
All rights reserved. No part of this publication
may be reprinted or translated in any form or by any means
without the prior written permission of Sartorius AG.
The status of the information, specifications and illustrations
in this manual is indicated by the date given below.
Sartorius AG reserves the right to make changes to the
technology, features, specifications, and design
of the equipment without notice.
Status: June 1998, Sartorius AG, Goettingen, Germany
Sartorius AG
37070 Goettingen, Germany
Weender Landstrasse 94 - 108, 37075 Goettingen, Germany
(551) 308-0, (551) 308-289