KERN CPB 3K1M, CPB 6K2M, CPB 15K5M, CPB 30K10M, CPB 3K0.1 Service Manual

KERN & Sohn GmbH

Ziegelei 1
D-72336 Balingen-Frommern
E-Mail: [e-mail]

Tel: 0049-[0]7433- 9933-0
Fax: 0049-[0]7433-9933-149
Internet: www.kern-sohn.com

GB

Service Manual

Electronic Counting Balance

Page 2

KERN CPB

Software rev.: 3.02 & above

Version 2.1 11/2007

CPB-SH-e-0721 2

CONTENTS

1.0 INTRODUCTION ..................................................................................................3

2.0 SPECIFICATIONS................................................................................................4

2.0 TROUBLESHOOTING..........................................................................................5

3.0 INSTALLATION ....................................................................................................6

3.1 GENERAL

INSTALLATION...............................................................................6

3.2 PREPARATION FOR USE................................................................................6

4.0 SERVICE PARAMETERS.....................................................................................8

4.1 USING “0000” TO ENTER THE CALIBRATION PARAMETER..........................8

4.1.1 F1 - CALIBRATION.........................................................................................9

4.1.2 F2 - PIN FOR CALIBRATION.........................................................................9

4.2 USING

“2006” TO ENTER THE SERVICE PARAMETERS .............................11

4.2.1 F1 - CALIBRATION....................................................................................... 12

4.2.1 F1 - CALIBRATION....................................................................................... 12

4.2.2 F2 - RESOLUTION.......................................................................................12

4.2.3 F3 - CAPACITY ............................................................................................12

4.2.4 F4 - INITIAL ZERO RANGE..........................................................................13

4.2.5 F5 - RE-ZERO RANGE ................................................................................13

4.2.6 F6 - SUCCESSIVE TARE.............................................................................13

4,2.7 F7 - A/D COUNT...........................................................................................14

4.2.8 F8 - ZERO....................................................................................................14

4.2.9 F9 - PIN........................................................................................................14

4.2.10 F10 - LVD MODE..........................................................................................15

4.3 WEIGHING UNITS [KG / G] ................................................................................15

5.0 WIRING DIAGRAM.............................................................................................16

6.0 MECHANICAL ASSEMBLY................................................................................17

7.0 FRONT DISPLAY SCHEMATIC .........................................................................18

7.1 FRONT DISPLAY ASSEMBLY........................................................................19

8.0 MAIN PCB SCHEMATIC.....................................................................................20

8.1 MAIN

PCB ASSEMBLY..................................................................................21

1.0 INTRODUCTION

• The CPB series of scales provide an accurate, fast and versatile counting

and check-weighing scales.

• CPB scales are kilogram only scales.

EC type approved scales are limited to lower resolution operation,
however the counting abilities still use the same internal resolution.

• They all have stainless steel weighing platforms on an ABS base

assembly.

• All scales available with RS-232 interface and real time clock (RTC).

• All scales have sealed keypad with colour coded membrane switches and

there are three large, easy to read liquid crystal type displays (LCD). The
LCD’s are supplied with a backlight.

• The scales include automatic zero tracking, audible alarm for pre-set

weights, automatic tare, pre-set tare, an accumulation facility that allows
the count to be stored and recalled as an accumulated total and an bi­directional RS-232 interface for communicating with a PC or printer.

CPB-SH-e-0721 3

CPB-SH-e-0721 4

2.0 SPECIFICATIONS

Approved Series

CPB-M SERIES

Model # CPB 3K1M CPB 6K2M CPB 15K5M CPB 30K10M

Maximum
Capacity

3000 g 6000 g 15 kg 30 kg

Readability 1 g 2 g 0.005 kg (5g) 0.01 kg (10g)
Tare Range -3000 g -6000 g -15 kg -30 kg
Repeatability
(Std Dev)

1 g 2 g 0.005 kg (5g) 0.01 kg (10g)

Linearity ± 2 g 4 g 0.01 kg (10g) 0.02 kg (20g)

Non Approved Series

CPB SERIES

Model # CPB 3K0.1 CPB 6K0.2 CPB 15K0.5 CPB 30K1

Maximum
Capacity

3000 g 6000 g 15 kg 30 kg

Readability 0.1 g 0.2 g 0.5g 1g
Tare Range -3000 g -6000 g -15 kg -30 kg
Repeatability
(Std Dev)

0.1 g 0.2 g 0.5g 1g

Linearity ± 0.4 g 0.8 g 1.5 g 3 g

Common Specifications

Interface RS-232 bi-directional interface
Stabilisation Time 2 Seconds typical
Operating
Temperature

0°C - 40°C

32°F - 104°F

Power supply 230 VAC 50/60 Hz.

120 VAC available.

Battery Internal rechargeable battery

(~50 hours operation)

Calibration External

Not available on EC approved units (locked)
Display 3 x 6 digits LCD digital displays
Balance Housing ABS Plastic, Stainless Steel platform
Pan Size 225 x 275mm

8.9” x 10.8”
Overall Dimensions
(wxdxh)

315 x 355 x 110mm

12.4” x 14” x 4.3”
Net Weight 4.1 kg / 9 lb
Applications Counting Scales
Functions Parts counting, weighing, accumulating memory,

pre-set count with alarm
Interface RS-232 bi-directional interface
Date/Time Real Time Clock (RTC),

To print date and time information.

(Dates in year/month/day, day/month/year or

month/day/year formats Battery backed)

CPB-SH-e-0721 5

2.0 TROUBLESHOOTING

1. Unit does not

turn on

Check whether the scale is plugged into the power supply properly.

Check the operation of the charging circuit.

Check whether the battery is charged- LED should turn to green
from red.

Check the adapter output.
.

2. The scale

weighs but is
unstable

Air drafts or vibration or unstable table.

Pan rubbing against case or not installed correctly.

Scale not installed properly.

Improper connections on ADC circuit.

3. Scale shows

wrong weight

Scale not installed correctly.

Check the Calibration.

To check whether a part of product weighed is trapped between
the pan and the scale.

Incorrect adjustment of the mechanical stops.

4.

An error “

E4”

displays on
the screen

Load cell damage.

Scale not installed properly.

Incorrect adjustment of the mechanical stops.

Factory calibration has been tampered with- check the ADC counts
and re-calibrate.

CPB-SH-e-0721 6

3.0 INSTALLATION

3.1 GENERAL INSTALLATION

The scales should not be placed in a location that will reduce the accuracy.

Avoid extremes of temperature. Do not place in direct sunlight or near air conditioning
vents.

Avoid unsuitable tables. The table or floor must be rigid and not vibrate.

Avoid unstable power sources. Do not use near large users of electricity such as
welding equipment or large motors.

Do not place near vibrating machinery.

Avoid high humidity that might cause condensation. Avoid direct contact with water. Do
not spray or immerse the scales in water.

Avoid air movement such as from fans or opening doors. Do not place near open
windows or air-conditioning vents.

Keep the scales clean. Do not stack material on the scales when they are not in use.

3.2 PREPARATION FOR USE

The scales come with a stainless steel platform, packed separately.

Place the platform in the receptacles on the top cover.

Do not press with excessive force as that could damage the load cell inside.

Level the scale by adjusting the four feet. The scale should be adjusted such that the
bubble in the spirit level is in the centre of the level and the scale is supported by all four
feet.

Turn the power ON using the switch located on the right side of the base.

CPB-SH-e-0721 7

The unit will display the software revision number in the Weight window and count
down to zero while performing a self-test.

When ready all three displays will show zero.

Refer to the CPB user manual for detailed operating instructions.