Adam Equipment PGW Precision Balances PGW2revA User Manual

							 
© Adam Equipment Company 2010                        39 
 
15.0  SAFETY AND MAINTENANCE 
   
CAUTION  
Use  the  AC  adapter  designed  by  the  manufacturer  for   the  balance.  Other 
adapters may cause damage to the balance. 
 
Avoid overloading or dropping material onto the pla tform which could damage 
the balance.    Do  not  spill  liquids  on  the  balance  as  it  is  not  wa ter-resistant.  Liquids  may 
damage the case and if it gets inside the balance i t may cause damage to the 
electronics. 
 
Material  that  has  a  static  electric  charge  could  in fluence  the  weighing. 
Discharge the static electricity of the samples, if  possible.  Another solution to 
the  problem  is  to  wipe  both  sides  of  the  pan  and  th e  top  of  the  case  with  an 
anti-static agent. 
 
16.0  TROUBLE-SHOOTING  
Service  of  a  PGW  balance  will  generally  be  necessar y  when  the  balance 
does  not  perform  as  expected.  The  balances  are  not  user-serviceable.  For 
Service  Information,  see  section  18.0  and  contact  A dam  equipment  or  your 
supplier.  
Problems usually fall into one of the following cat egories: 
 
User Problems:    
The  user  is  asking  the  balance  for  something  it  can not  do  or  is  confused  by 
the  modes  and  functions  of  a  balance.    It  is  also  p ossible  the  user  has  set  a 
parameter  that  has  affected  the  balance  operation.    Resetting  the  parameter 
to a normal value will restore operation. 
 
Mechanical Problems 
The  balances  consist  of  complicated  and  fragile  mec hanical  devices.    They 
can be damaged by placing a weight on it which is t oo high for the balance or 
by dropping the balance or occasionally shipping it   without taking care.   The 
most fragile parts are the flexures.   Dust, dirt,  spills and other foreign objects 
in the balance can also cause problems. 
 
Electronic Problems:  
						

							 
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These  are  the  rarest  of  the  problems  affecting  bala nces.    If  an  electronic 
problem  is  suspected  make  sure  the  mechanical  probl ems  that  can  cause 
similar  symptoms  have  been  eliminated  before  attemp ting  electronic  repairs.  
With  the  exception  of  cables  most  electronic  repair s  are  solved  by  board 
replacement. 
 
The  table  that  follows  is  a  guide  of  common  problem s  and  their  solutions.  
Note  that  many  problems  may  have  multiple  solutions   and  there  may  be 
problems  found  that  are  not  listed  in  the  table.    F or  Service  Information, 
contact Adam Equipment or your supplier. 
 
BALANCE DOES NOT FUNCTION  
Problems  Possible causes  Suggestions 
The balance is dead  
when power is applied  Power supply failure  Check adapter is working 
Check adapter is correct for the balance  
Normal adapter is 15VDC, 800mA. 
*Power supply circuit board failure 
*Short circuit on any circuit board 
The display does not  
turn on but the 
calibration motor 
moves when power is 
applied  Power is getting to 
balance, display is not 
working 
*Display cables may be faulty  
*Display module failure 
The display stays on  
the initial test screen 
when power is applied.  
Calibration weight 
motor is on.  Unstable balance  
Balance not working  
correct   
Power supply 
*Check if balance is stable by using  
service menu and view A/D values  
Put draught shield over pan 
Check power supplies 
BALANCE WORKS BUT IS NOT STABLE 
Balance is unstable by  
a few divisions 
Noise or vibration 
from environment  
Friction in mechanics  Check the balance is positioned  
correctly to avoid vibration, wind or air 
movement, it is on a solid table, It is not 
near sources of heat or cool air,  
Check balance with weights if problem  
occurs when sample is used.  Static 
electricity on the samples can cause 
drifting and instability.  
Check the area around the weighing  
pan for hair, dust, obstructions under 
the pan,   
*A complete inspection of the  
mechanics to look for sources of friction 
may be needed.  
						

							 
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Balance is very  
unstable and does not 
weigh correctly Mechanical problems   
Balance programming   
 
Electronic problems   *A complete inspection of the  
mechanics to look for sources of friction.
 
*Verify the A/D is also unstable.  If the  
A/D is OK then suspect the 
programming of the balance.  Reset 
parameters, check linearity and redo the 
calibration.  
Some electronic problems can also  
cause this.  But all mechanical problems 
must be resolved first.   
BALANCE IS NOT ACCURATE 
  
You must have accurate and trusted weights to test 
a balance.  If you suspect that the 
balance is not accurate then you must know your wei ghts are accurate.  A balance 
calibrated using a bag of flour is not accurate eve n if it works OK otherwise. 
 
Balance is not accurate Repeatability 
 
Eccentric loading   
 
Linearity    Verify the balance shows the same  
value when the same mass is placed on  
the centre of the pan for a few tests.  
Verify the balance shows the same  
reading (within a tolerance depending 
upon the model) when a mass is placed 
at positions around the pan.  
Verify the balance is acceptable  
throughout the weighing range.  The 
balance must give acceptable readings 
from low weights up to the capacity.   
Poor Repeatability  Usually a mechanical 
problem. Inspect the area around the pan for hair,  
dust or other obstructions,    
*Inspection of the mechanics may be  
needed for any possible problems.   
Poor Eccentric loading  A mechanical problem  Inspect
 the area around the pan for hair, 
dust or other obstructions,    
*Inspection of the mechanics may be  
needed for any possible problems.  
*Readjusting of the Eccentric loading is  
recommended. 
  
						

							 
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Poor Linearity  Usually a mechanical 
problem    
  
Electronic Problems Re-check repeatability 
*Inspection of the flexures for damage  
or loose hardware may be required  
*Use the Linearity Function in the  
service menu to reset linearity  
*A problem in the analogue circuit board  
or power supplies can cause poor 
linearity.  Make sure all mechanical 
problems have been eliminated first  
  
OTHER PROBLEMS: 
Cannot calibrate  Zero shifted more 
than allowed 
 
Calibration timeout *Check all flexures for damage  
*Reset dealer calibration 
*Verify linearity and repeatability  
*The balance may be unstable.  Verify  
stability as above.     
Calibration weight  
motor does not stop 
   
 
   *Check the cables to the motor, try  
plugging the balance into the power  
again  
*Look for friction in the calibration  
weight movement  
*Check the opto-coupler that controls  
the motor position.    
RS-232 not working  Doesn’t print  Check parameters m
atch the device 
connected  
Verify cable is correct 
*RS-232 circuits damaged  
Display dark, keys  
beep   Display contrast poor  
Cable unplugged or  
damaged *Check the cables to the display  
*Replace the display which could be  
damaged   
*To be carried out by authorised technicians only.  
						

							 
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17.0  REPLACEMENT PARTS AND ACCESSORIES 
 
If you need to order any spare parts and accessorie s, contact your supplier or 
Adam Equipment. A partial list of such items is as  follows- 
 
  Power Supply Module 
   Stainless Steel top Pan 
   Below Balance Hanger 
   Density Determination Kit 
 
  Anti-Vibration Table 
   Security Lock and Cable 
   Dust Cover 
   Printers, etc. 
 
 
18.0  SERVICE INFORMATION 
 
This  manual  covers  the  details  of  operation.  If  you   have  a  problem  with  the 
balance  that  is  not  directly  addressed  by  this  manu al  then  contact  your 
supplier for assistance. In order to provide furthe r assistance, the supplier will 
need the following information which should be kept  ready: 
 
 
     
A.  Details of your company 
    -Name of your company:  
    -Contact person’s name: 
    -Contact telephone, e-mail,   
     fax or any other methods: 
 
B.  Details of the unit purchased  
      (This part of information should always be availabl e for any future correspondence. 
We suggest you to fill in this form as soon as the  unit is received and keep a print-
out in your record for ready reference.) 
            
Model name of the balance: 
 
PGW________ 
Serial number of the unit: 
 
 
Software revision number  
(Displayed when power is first turned on): 
 
 
Date of Purchase: 
 
 
Name of the supplier and place: 
 
         
C.   Brief description of the problem 
          Include any recent history of the unit. F or example:        
   -Has it been working since it’s delivered  
   -Has it been in contact with water  
  -Damaged from a fire  
  -Electrical Storms in the area  
  -Dropped on the floor, etc.   
						

							 
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							 © Adam Equipment Company 2010                                                                       
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19.0  BALANCE MENU STRUCTURE  
   
						

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WARRANTY INFORMATION 
Adam Equipment offers Limited Warranty (Parts and Labor) for the components failed due 
to defects in materials or workmanship.  Warranty starts from the date of delivery. 
During the warranty period, should any repairs be necessary, the customer must inform 
the supplier or Adam Equipment. The company or its authorised Technician reserves the 
right to repair or replace any components at its own discretion. Any shipping costs involved 
in sending the faulty units to a service centre is the customers responsibility. 
The warranty will cease to operate if the equipment is not returned in the original 
packaging and with correct documentation for a claim to be processed. All claims are at 
the sole discretion of Adam Equipment. 
This warranty does not cover equipment where defects or poor performance is due to 
misuse, accidental damage, exposure to radioactive or corrosive materials, negligence, 
faulty installation, unauthorised modifications or attempted repair or failure to observe the 
requirements and recommendations as given in this User Manual. 
Repairs carried out under the warranty does not extend the warranty period. Components 
removed during the warranty repairs become the company property. 
The statutory right of the purchaser is not affected by this warranty. The terms of this 
warranty is governed by the UK law. For complete details on Warranty Information, see the 
terms and conditions of sale available on our web-site