Mi111101.eps
WMI5005-e07113
Service Manual
Sartorius Midrics Series
Models MW1P | MW2P | MW1S | MW2S
for Complete Midrics Scales
Models MIS1 | MIS2
for Midrics Indicators
and
Models MAPP1 | MAPS1
MAPP4 | MAPS4
for Midrics Weighing Platforms
including Service Specifications
2
Contents
Overview
General Information 04
Service Concept 04
Information 04
Overview of the Models 05
Auxiliary Service Tools and Equipment 05
Accompanying Literature 06
Description of the Equipment
Indicators 07
Function of the Switches 08
Menu Access Switch 08
Repairing the Midrics Indicator
Repairing the Indicator 09
Replacing the Front Panel 10
Blank Display 11
Replacing the Power Cable 11
Replacing the Power PCB 12
Points of Measurement 13
Replacing the Main PCB 14
Quick-test of the A/D Converter 14
Pin Assignment Chart 14
Replacing the Main PCB 15
Terminal Assignments in Midrics Indicators 16
Interface Description 17
RS-232 Interface 17
RS-485 Interface 17
RS-485 Analog Interface 17
Digital I/O Interface 18
COM1 Interface With and Without Clock Chip 18
Adjusting the Weighing Platform
Adjusting the Weighing Platform 19
Junction Box 1 20
Pin Assignments in the Junction Box 1 21
Junction Box 2 22
Cable from the Load Cell
to the Junction Box 2 (Terminals) 23
Cable from the Load Cell
to the Junction Box (Terminals) 24
Adjusting the Off-center Load 26
Setting the Overload Stops 27
1. Weighing Platforms with One Load Cell: Steel 27
2. Weighing Platforms with Four Load Cells: Steel 27
3. Weighing Platforms with One Load Cell:
Stainless Steel 28
4. Weighing Platforms with Four Load Cells:
Stainless Steel 28
3
Contents
Repairing the Weighing Platforms
Replacing the Connecting Cable 29
Replacing Load Cells 30
Torque Values 31
Replacing the Load Cell Foot 32
Color Codes of the Wiring
for Weighing Platforms, Models MAPS 32
Wiring Diagram for the Load Cells (Junction Box 2) 32
Connections in the Junction Box
for the Load Cells 1-4 33
Connections in the Junction Box
for the A/D Converter 33
Service Specifications
Service Specifications MW...-L / MAP...-L 34
Service Specifications MW...-LCE / MAP...-LCE 35
Service Specifications MW...-NCE / MAP...-NCE 36
Service Specifications MW...-NCE / MAP...-NCE 37
Adjusting the Weighing Platform
Load Cell Connection (Color Assignments) 38
Determining the Resistance for Adjustment
of the Off-center Load 39
Determining Resistance Values 39
Sample Calculation Based on Diagram 2 40
Resistors Available in the E24 Series (+/- 5%): 41
Selecting the Adjustment Resistor 42
Adjusting Off-center Load with 1000 Ohms Initial
Resistance 42
Selecting the Adjustment Resistor: 43
Diagram 1 43
Adjusting Off-center Load with 350 Ohms
Initial Resistance 43
Diagram 2 44
Adjusting Off-center Load with 1000 Ohms
Initial Resistance 44
Error Codes
Err 101-343 ; InF 01-06 45
InF 07-73 46
InF 74-99 47
Description of the Equipment
Activating the Service Mode 48-49
Configuring the A/D Converter 50-51
4
Overview
General Information
Service Concept
Prerequisites for performing maintenance and repair work on Sartorius Midrics
scales requires considerable experience with both indicators and weighing platforms.
In case of defects, repairs are performed on site. Generally, the equipment is not
replaced.
– Do not connect or disconnect cables to or from the equipment; always
disconnect the power cable from the wall socket (mains supply) first!
Information
– To ensure safety, an isolating transformer must be installed between the
indicator and the power supply before performing work that entails opening
the Midrics indicator housing.
On complete Midrics scales, check and adjust as necessary:
– Repeatability (standard deviation)
– Off-center load
– Span
– Linearity
(The procedure is the same as for all scale and weighing platform models.)
5
Overview of the Models
The hardware configuration consists of either a Midrics 1 or 2 indicator and
Sartorius weighing platform(s), or a Midrics 1 or 2 indicator and weighing
platform(s) (strain-gauge load cells) from another manufacturer.
Important: Mechanical and electrical service or repair work on the complete Midrics scale
requires considerable experience, and for this reason should be performed only
by Sartorius technicians trained at the factory. Any attempt to perform repair
work can result in damage to the equipment.
Auxiliary Service Tools and Equipment
In addition to standard tools, you will need the following special tools to work on
the complete Midrics scale:
Qty. Designation
1 Isolating transformer
1 Flintec LCT-01 load cell tester
1 Socket wrench, double hexagon, 10-32 mm, square driver (1/2“)
1 Torque wrench, 10-120 Nm 14x18, stainless steel
Overview | General Information
6
Qty. Designation
1 Torque wrench, 60-320 Nm 14x18, stainless steel
1 Set of open-ended wrenches with sockets
1 Set of sockets, up to 30 mm (hexagonal, stainless steel)
2 Transport belt (to move load plates or weighing
platforms; available from specialist suppliers)
2 Ring lugs (stainless steel; for moving the load plates or
weighing platforms; available from specialist suppliers)
1 Set open-ended wrenches (spanners)
(up to 24 mm, stainless steel)
1 Threaded rod, M 16x120, for lifting the weighing platform
(available from specialist supplier)
1 Set of screwdrivers (slotted)
1 Set of screwdrivers (Phillips head)
1 Set of Allen wrenches
1 Strain gauge simulator
Accompanying Literature
Operating instructions for Complete Midrics 1 | 2 Scales WMW6004-e06101 98648-014-94
Operating instructions for Midrics 1 | 2 Indicators WMI6001-e06101 98648-014-89
Operating instructions for Painted or Stainless Steel Weighing Platforms WMA6037-e06101 98648-015-33
Overview | General Information
7
Description of the Equipment
The complete Midrics scales from Sartorius are primarily used in industry. Because there are a number of hardware
configurations to choose from, Midrics models are constructed according to customer requirements.
The complete Midrics scale consists of:
– A choice of weighing platforms with capacities from 3 kg to 3000 kg (in stainless steel or steel) and indicators
The Midrics 1 / 2 indicators consist of:
– Front panel with keypad and
digital display (Midrics 2 has
additional keys)
– Midrics indicators
are equipped with either cable
glands or D-Sub 25 connectors.
Note: Additional electronic subassemblies are optional.
P1250006a.JPG
Main PCB with H8S
processor, analog/
digital converter and
DC/DC converter
Power PCB
AUT23957.JPG
UniCOM ports in several variants*
COM1 interface in 2
versions*
1 2 3 4 5 6
* Optional
8
Function of the Switches
This switch must be open to work with the service software or to configure the A/D
converter (e. g., “Trade” configuration). If the menu access switch is closed, the
error message “ACCESS SWITCH LOCKED” is displayed in the service program and
the indicator shows “L” (underload) or “H” (overload). In this case, the A/D
converter cannot be configured. If adjustment is necessary (span, linearity), the
“± 2%” window is active.
Description of the Equipment
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closedopen
A
9
Repairing the Midrics Indicator
Indicator
Important:
An isolating transformer must be installed between the indicator
and mains before performing work that entails opening the Midrics
indicator housing.
To open the Midrics indicator, remove the four nuts as shown in the illustration on
the left.
Note: After completing maintenance or repair work, check the seal between the
front panel and the housing body for damage and replace if necessary. If
the Midrics indicator in question has an IP65 protection rating,
a special test procedure is used to check the IP65 protection after the
housing has been closed.
Mi171107.eps
!
10
Replacing the Front Panel
In the case of a defective key, keypad
overlay, or display, the entire front panel
must be replaced.
There are two front panel variants, Midrics 1
and Midrics 2. The only difference between
the two is the range of operating keys.
If the indicator housing seal is defective, it
must be replaced. When installing a new
seal, make sure it rests entirely within the
housing and is not caught between the
upper and lower housing parts when you
close the indicator.
P1250008.JPG
P1250006a.JPG
P1250006b.JPG
AUT23993.JPG
P1250008.JPG
AUT23993.JPG
Repairing the Midrics Indicator
11
Blank Display
If the display is blank (dark), disconnect the equipment from mains, open the
housing and disconnect all cables and wires from the subassemblies.
Then connect the equipment to power again through an isolating transformer and
connect all subassemblies again, measuring the supply voltage in each case.
– The voltage at the power supply output (connector A; see page 12) is
15V ± 0.3 V direct current.
– The output voltages of the DC/DC converter are listed on page 13.
Replacing the Power Cable
– Disconnect the cable from the power source.
– Open the housing.
– Replace the cable
Note:
After replacing the power cable, use
a torque wrench to tighten the cable
gland to
3 Nm3 Nm
3 Nm3 Nm
3 Nm.
pg_netz.jpg
Repairing the Midrics Indicator
AUT23977a.JPG
12
Replacing the Power PCB
– Disconnect the cable from the power source.
– Pry the protective cap from the power PCB.
To do this, insert the end of a slotted-head screwdriver into each of the four
openings on the protective cap and carefully push the retainer clips, located
further down, to one side.
– Remove the protective cap and disconnect the two wires (blue/brown).
– Unplug connector A, remove the 2 screws and replace the power supply. After
replaceing the PCB, make sure to return the protective cap to its original
position.
netzt_kappe.jpg
netzteil.jpg
A
Repairing the Midrics Indicators
13
Points of Measurement
Note:
Use a digital voltmeter
(DC setting) to measure voltages
against ground (earth). No
particular points of measurement
are defined for this procedure; for
this reason, use a thin test pin and
exercise extreme caution to avoid
short-circuiting the equipment.
The various supply voltages
delivered by the DC/DC converter
can be measured at the following
points.
M 1: 15 V ± 5% Input voltage for the DC/DC converter.
M 2: –9.2 V ± 5% Supply voltage for the A/D converter
M 3: +9.2 V ± 5% Supply voltage for the A/D converter
M 4: 5 V ± 5% Supply voltage for the digital PCB
M 5: 3.3 V ± 5% Supply voltage
Repairing the Midrics Indicators
AUT23902_b.JPG
M1
M3
M4
M5
M2
14
Replacing the Main PCB
– Before replacing the main PCB, try to read out the data from the main PCB
controller using the service software; if this is successful, you can load the
adjustment data in the controller of the new main PCB once it is installed. In
many cases, this precludes the need to adjust the weighing system.
Quick-test of the A/D Converter
Pin Assignment Chart
No. Signal designation Meaning Voltage
1 BR_POS Bridge supply voltage (+) 4.5V ± 0.18V
2 SENSE_POS Sense (+)
Bridge supply voltage
3 OUT_POS Measuring voltage positive
4 OUT_NEG Measuring voltage negative
5 SENSE_NEG Sense (-)
Bridge supply voltage
6 BR_NEG Bridge supply voltage (-) –4.5V ± 0.23V
Repairing the Midrics Indicators
AUT23958_c.JPG
15
1. Connect the strain-gauge simulator and turn the switch to simulate different
input signals. The weight readout should be stable.
Replacing the Main PCB
Note: If communcation problems occur during communication with connected
devices (such as a printer), check the cable connections and the data
transfer parameters first; if the error source is not found, start the
internal test program.
– Switch off the indicator.
– Press and hold the k key while switching the indicator on again.
All segments are displayed.
– In case of defect, replace the main PCB.
– After replacing the main PCB, use the
PpLoadWH8.exePpLoadWH8.exe
PpLoadWH8.exePpLoadWH8.exe
PpLoadWH8.exe program to load the
software.
Note: To load the software, COM PCB model YDO01M-232 or YDO01M-232CLK
is required.
Following installation and commissioning of the new main PCB, the
display backlighting should blink on and off.
Repairing the Midrics Indicators
AUT23961_a.JPG
Main PCB
AUT23967.JPG
YDO01M-232 YDO01M-232CLK
without clock chip with clock chip
16
Terminal Assignments in Midrics Indicators
COM1 with Variant: | UniCOM with Option:
Standard data output Data output Clock RS232 RS485 4-20mA Digital I/0
Pin YDO01M-232 YDO01M-232CLK YDO01M-232CO YDO01M-485 YDO01M-20MA YDO01M-IO
1 LOAD_PRINTER LOAD_PRINTER CTS TXD+ I_out (+) OUT5_LOW
2 RESET_OUT RESET_OUT DTR TXD- I_in (-) OUT5_HIGH
3 5V_OUT 5V_OUT RXD RXD+ V_out (+) OUT4_LOW
4 GND GND TXD RXD- V_in (-) OUT4_HIGH
5 CTS CTS GND GND elec. isol. GND elec. isol. OUT3_LOW
6 DTR DTR Universal In GND elec. isol. GND elec. isol. OUT3_HIGH
7 RXD RXD MINOR (<) OUT2_LOW
8 TXD TXD PARES (=) OUT2_HIGH
9 MAJOR (>) OUT1_LOW
10 SET OUT1_HIGH
11 LOAD_PRINTER LINE_OUT * IN5_LOW
12 RESET_OUT LINE_OUT * IN5_HIGH
13 GND GND * IN4_LOW
14 GND GND * IN4_HIGH
15 5V_OUT IN3_ LOW
16 5V switched IN3_HIGH
17 GND IN2_ LOW
18 GND IN2_HIGH
19 n.c. IN1_ LOW
20 LINE_OUT IN1_HIGH
Repairing the Midrics Indicators
* not electrically isolated
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