Unitek UNIBOND 2, Руководство пользователя

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8 . 0 0 . C A L I B R AT I O N
8.01. U n i t e k uses a s p e c i a l sample and hold technique t o p r e c i s e l y measure t h e
pulse amplitudes and p u l s e d u r a t i o n s . Y o u w i l l have t o r e l y on t h e accuracy o f your
oscilloscope. C a l i b r a t e i t c a r e f u l l y. T h e width o f t h e t r a c e can cause e r r o r s o f
greater t h a n 10% when measuring p u l s e amplitude.
8.02. S E T U P
8.02.01. T h e f o l l o w i n g equipment i s r e q u i r e d f o r c a l i b r a t i o n :
1. 4 1 / 2 d i g i t d i g i t a l v o l t m e t e r.
2. O s c i l l o s c o p e .
3. 6 i n c h p i e c e o f 20 gauge copper w i r e , t h e r e s i s t a n c e o f which should b e
approximately 5 milliohms.
4 . 1 2 i n c h p i e c e o f 20 gauge copper w i r e , t h e r e s i s t a n c e o f which should b e
approximately 1 0 milliohms.
8.02.02. S e t Onibond C o n t r o l s a s f o l l o w s :
PULSE AMPLITUDE: 0 . 5 0
PULSE DURATION: 0 7
FEEDBACK MODE: V O L T A G E
WELD RESISTANCE: 5
WELD RESISTANCE RANGE: X 1
POWER SWITCH: O F F
8.02.03. Connect t h e Output Transformer and t h e Feedback and F i r i n g Cables from t h e
Weld Head t o t h e Unibond. Remove t h e c o v e r from t h e Unibond.
8 . 0 2 . 0 4 . Connect a jumper across R103. C o n n e c t a jumper across CR33.
8 . 0 2 . 0 5 . Switch t h e power t o "ON" and check t h a t t h e f o l l o w i n g voltages a r e present
a t t h e p o i n t s i n d i c a t e d below: I f any o f t h e s e vol tag es a r e n o t p r e s e n t , t r o u b l e -
shoot t h e r e g u l a t o r c i r c u i t s .
+14.25 t o + 1 5 . 7 5 v o l t s a t ( + ) s i d e o f C24.
-14.40 t o - 1 5 . 6 0 v o l t s a t ( - ) s i d e o f C23.
+16.75 t o + 1 9 . 2 5 v o l t s a t ( + ) s i d e o f C27.
+85.00 t o +95.00 v o l t s on c o l l e c t o r ( c a s e ) o f Q16 - Q22.
8 . 0 3 . A D J U S T I N G PULSE WIDTH
8.03.01. W i t h t h e power OFF, connect t h e scope t o p i n 9 o f U4. S e t t h e sweep t o 1 0
ms/cm. W i t h power ON, t r i g g e r t h e Unibond f i r i n g c i r c u i t b y l i f t i n g up o n t h e Weld
Head.
8 . 0 3 . 0 2 . W i t h t h e Unibond Pulse D u r a t i o n Switch s e t t o 7 0 ms, a 7 0 ms pulse should
appear on t h e scope whenever t h e Unibond i s f i r e d . P u l s e d u r a t i o n c a l i b r a t i o n may b e
changed, i f necessary, b y a d j u s t i n g R1.
8.04. I M P R O P E R SETTING INDICATOR CHECK
8 . 0 4 . 0 1 . S e t Pulse Amplitude t o 0 . 9 9 . T h e Improper S e t t i n g I n d i c a t o r should remain
OFF.
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