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5.7  Mounting the drive unit

With moderate pressure on the pin (105), push the venturi insert (101) into the vertically positioned mixer body (130) 

up to the mechanical stop. Then place the threaded rod (111) on the end of the pin up to the mechanical stop. 

In the process, it must be ensured that the threaded rod is positioned over its hole in the fixing washer of the cylinder 

pin (134). By tightening the threaded pin (110), the pin is fixed in the hold. Secure the threaded pin with a low-strength 

thread locker (e.g. LOCTITE 221).

Place the stepper motor (113) on the threaded pin and screw it on by rotating the stepper motor spindle up to 

the mechanical stop on the flange of the induction elbow (133). Fasten the stepper motor on the induction elbow 

with four cylinder screws (112); in the process, observe the tightening torque for the screws (Table 4).

Place the receptacle (115) on the stepper motor spindle and align it to the desired side with the sensor fastening 

thread (alignment in the direction of the output flange of the induction elbow is not possible due to the spatial 

constraints), and install the cylinder screws (116).

Slide the washer (119) on as shown under 

6.1

 until the mechanical stop of the threaded rod is reached and fasten 

with an M6 hexagon nut (120). Observe the tightening torque (Table 4, page 8).

 

Then fit the cap (121) and screw in the inspection glass (109) with seal in the induction elbow.

5.8  Adjusting the proximity sensors (limit switches)

 

Connect the stepper motor (113) of the mixer to the stepper motor control.

Adjust a mixing gap of 0.5 + 0.1 mm by moving the stepper motor. An adjustment of 0.5 mm takes place with 

a control frequency of 20 Hz in full step operation in 5 seconds.

With a change to the control frequency by a factor K, the adjusting time changes by the 

factor 1/K.

 

 

With a change to the step precision by a factor 1/F, the adjusting time changes by the factor F.

With an adjustment of both parameters, factors F and 1/K are multiplied.

Adjust the switching point of the “lean” position by screwing in the proximity sensor (117). Screw in the proximity 

sensor until the LED on the sensor goes out. Then lock the proximity sensor in its position by tightening the 

counter nut. Observe the tightening torque according to section 

6.1 Spare parts drawing.

If the device is equipped with two sensors, the switching point for the “rich” position is adjusted first (max. mixing 

gap width). For this purpose, increase the mixing gap an additional 4.5 mm from the “lean” switching point by 

moving the stepper motor (total gap width 5 + 0.1 mm). In full step operation the additional adjustment at 

a 60 Hz step frequency takes place in 15 seconds. Observe the notice above.

The adjustment of the screw-in position of the proximity sensor, “rich” switching point, takes place analogously to the 

adjustment of the “lean” switching point. Then lock the sensor in place here as well by tightening the counter nut.

Note

985.29-2 p.11

Summary of Contents for HON 985A

Page 1: ...Gas Mixer HON 985A 985 29 2 Serving the Gas Industry Worldwide OPERATING AND MAINTENANCE INSTRUCTIONS SPARE PARTS EDITION 01 2017 ...

Page 2: ...d l a n o i s n e m i D 4 3 4 Specific maintenance instructions 8 8 s n o i t c u r t s n i e c n a n e t n i a m r o f s l a v r e t n I 1 4 4 2 Tightening torques MA 8 4 3 Lubricants 8 4 4 Adhesives 8 5 Maintenance 9 9 s r o s n e s y t i m i x o r p e h t g n i l t n a m s i D 1 5 5 2 Dismantling the drive unit 9 0 1 t r e s n i i r u t n e V e h t g n i l t n a m s i D 3 5 0 1 s t l e b e d i ...

Page 3: ...not been any unusual observations during operation and or functional testing The check must include in particular seals all moving parts such as parts with transmission thread and the venturi insert Any and all defective parts must be replaced with new ones The same applies to o rings removed during dismantling Do not use any spare wear parts and or oils lubricants not specifically recommended in ...

Page 4: ...mixing gap reduce the mixing gap 1 4 Structure and mode of operation gas 2 fuel gas flowing in through an upstream gas pressure control section to the same pressure as gas 1 air With the reduction of the cross section there is an acceleration of gas 1 air flowing in Acceleration means the pressure of the gas For the mixture of the gases a torpedo designed for maximum flow rates of the gas mixture ...

Page 5: ...M R B N s l a e S Max operating and environmental temperature 10 C to 80 C SEP design in accordance with PED Table 1 Technical features of the mixer 3 2 Dimensions and technical features of the stepper motor Fig 2 Dimensional drawing of the stepper motor Connection plug Caution Cable and connection plug must be fastened properly so that a cable break does not occur Note max r o t o m r e p p e t s...

Page 6: ... r f e c a f r u s e v i t c A V 3 0 d e r e v o c e c a f r u s e v i t c A Interference voltage permissible voltage peaks max 1 000 V 10 ms Ω k 0 1 e c n a t s i s e r l a n r e t n I e e r f s i e c a f r u s e v i t c a n e h w t h g i l w o l l e y D E L s u t a t s g n i h c t i w S 3 1 W S t u n r e t n u o c d n a g n i t s u j d A Note A straight socket compatible with the proximity senso...

Page 7: ... gas Gas connection 1 305 approx 52 to 65 Fastening clamp Locking screw Inspection glass Proximity sensor lean Comments 985 29 2 p 07 Fig 6 Mixer and gas connection dimensional drawing Flange type second rich proximity sensor optional Type 1 Type 2 Type 3 Type 4 Rp 1 266 to 279 Flow direction I Variable torpedo diameter see spare parts list Induction elbow can be installed at any angle position in...

Page 8: ...tely after the discovery of the deviation in operating behaviour Note 2 3 1 3 2 1 0 2 1 2 1 1 o n s o P Tightening torque in Nm 8 2 8 12 212 Table 4 Tightening torques MA 4 3 Lubricants o n t r a p HON s t n a c i r b u L s t n e n o p m o C e s a e r g e n o c i l i S s g n i r O l l A e t s a p y l b m e s s A s w e r c s g n i n e t s a f l l A Transmission thread and conical washer on the thre...

Page 9: ...nsert 101 is first pushed to the mechanical stop on the mixer body 130 and then unscrewed from the threaded rod with additional rotation of spindle of the stepper motor 113 Caution The next step is the removal of the threaded rod 111 from the device For this purpose unscrew the inspection glass 109 from the induction elbow 133 and loosen the clamp connection between the threaded rod and the pin 10...

Page 10: ...ng behaviour of the device Caution 5 5 Installing the venturi insert Move the mixer body 130 up to the vertical position with the connection side facing the induction elbow 133 Mount the torpedo unit 126 on the venturi insert 101 In the process the pan head screw must be secured with low strength thread locker e g LOCTITE 221 Slide the guide body 102 into the mixer body up to the mechanical stop I...

Page 11: ... 109 with seal in the induction elbow 5 8 Adjusting the proximity sensors limit switches Connect the stepper motor 113 of the mixer to the stepper motor control Adjust a mixing gap of 0 5 0 1 mm by moving the stepper motor An adjustment of 0 5 mm takes place with a control frequency of 20 Hz in full step operation in 5 seconds With a change to the control frequency by a factor K the adjusting time...

Page 12: ...d rotated through 90 pictured rotated through 145 pictured rotated through 90 6 Spare parts 985 29 2 p 12 6 1 Spare Parts Drawing HON 985A 100 50 ZW N NI M A Be sure to comply with torque figures in table 4 on page 8 W Parts should be held in stock for maintenance purposes Use adhesive connection in accordance with table 6 page 8 A A M A 10 Nm M A M A M A M A ...

Page 13: ...1 4 2 K 1 t e k c o S 8 1 1 9 8 2 6 2 0 0 1 M L 1 e n o c r e h s a W 9 1 1 4 1 4 5 t S 1 t u n n o g a x e H 0 2 1 0 7 0 6 2 K 1 p a C 1 2 1 6 5 1 4 1 t S 4 r e h s a W 2 2 1 0 2 3 0 1 t S 4 w e r c s r e d n i l y C 3 2 1 124 Flange DN 40 alternatively 5 3 7 0 2 0 0 1 t S 1 1 e p y t e g n a l F 4 2 1 4 3 7 0 2 0 0 1 t S 1 2 e p y t e g n a l F 4 2 1 3 3 7 0 2 0 0 1 t S 1 3 e p y t e g n a l F 4...

Page 14: ... r o T 6 2 1 7 9 4 0 3 0 0 1 K 1 6 3 ø o d e p r o T 6 2 1 5 7 1 6 2 t S 1 w e r c s g n i k c o L 7 2 1 2 4 8 8 1 M L 1 g n i r l a e S 8 2 1 6 5 2 6 2 0 0 1 K W 1 t l e b e d i u G 9 2 1 1 6 2 6 2 0 0 1 M L 1 y d o b r e x i M 0 3 1 7 5 2 6 2 0 0 1 K W 1 t l e b e d i u G 1 3 1 7 2 2 8 2 t S N 1 p i l c e l fi o r P 2 3 1 7 9 2 6 2 0 0 1 M L G 1 w o b l e n o i t c u d n I 3 3 1 7 7 2 7 1 t S 1 ...

Page 15: ... 1 g n i r a e b t c a t n o c g n i d i l S 7 0 1 6 5 2 6 2 0 0 1 1 t l e b e d i u G 9 2 1 7 5 2 6 2 0 0 1 1 t l e b e d i u G 1 3 1 8 8 6 6 2 1 r e k c o l d a e r h T 1 8 0 7 2 1 e s a e r g e n o c i l i S 1 9 0 7 2 1 e t s a p y l b m e s s A 4 0 7 7 2 1 t n e g a p i l S 0 9 6 6 2 1 e v i s e h d A 6 3 Parts for maintenance purposes 985 29 2 p 15 ...

Page 16: ...visit www honeywellprocess com or contact your Honeywell account manager GERMANY Honeywell Process Solutions Honeywell Gas Technologies GmbH Osterholzstrasse 45 34123 Kassel Germany Tel 49 0 561 5007 0 Fax 49 0 561 5007 107 HON 985 29_2 2017 01 2017 Honeywell International Inc ...

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