3.1 Function empty switch: take suction lance out of container – L3 burns[ ]
3.2 Function dosing pump: programm “test acid” – acid is suct up[ ]
4. Control unit – after opening of the housing
4.1 check all push connectors: well pushed in[ ]
4.2 External control: auto-controller on „Manual“ – chlorine doses[ ]
4.3 External control: auto-controller on „Manual“ – acid doses[ ]
4.4 External control: check any linked switch off [ ]
5. Other jobs
5.1 Clean GRANUDOS thoroughly [ ]
5.2 Clean environement of GRANUDOS thoroughly [ ]
5.3 Operation instructions discussed and handed to the operator [ ]
at switches note 6 seconds delay!)
No warranty without fully signed commissioning form!
WDT Operating Instruction GRANUDOS 25/45/100 (S41C-06/12) page 3 of 27
TABLE OF CONTENTS
Test certification: - loose insert Main Safety devices 1
Commissioning form 2
page
1. Notes to this manual................................................................................................................... 4
1.1 What does that manual desrcibe .................................................................................................... 4
1.2 Target group .................................................................................................................................... 4
1.3 Safekeeping of the manual .............................................................................................................. 4
1.4 Intended use .................................................................................................................................... 4
2.1 Technical Data .................................................................................................................................. 6
2.2 The Drum Carrier ......................................................................................................................... 7
Chlorine dosing performance depends on chlorine
quality and is affected by too fine or too coarse
or humid product. Acid dosing performance is given in litres
per hour. It is recommended to use sulphuric acid 37%.
1
2 2 clamp bands
3 belts for fasten drum
4 dosing hoper
5 locker for safety belt
6 dissolving system
7 controlsystem
8 type label (not seen)
9 locker for drum carrier
10 acid pump
11 dust protection tube
12 acid carboy lance
13 acid container with tub
8
WDT Operating Instruction GRANUDOS 25/45/100 (S41C-06/12) page 7 of 27
2.2 The Drum Carrier
The rotating drum carrier assembly (6) is fixed to the main vertical support (10). The drum
(1) with chlorine is fixed on the carrier assembly (6) by 2 band clamps (2) and a retaining belt.
The dosing hopper (3) is fixed on the drum in place of the drum lid. The carrier with the drum is
then turned through 180° to the dosing position, the chemical is dosed into the dissolving
system (5) where it is fully dissolved and conveyed by a venturi to the buffer tank.
2.3 Chlorine Dosing Assembly
19
17
15
10
11
13
14 18
16
12
10 dosing hopper 16 hopper cover
11 dosing motor 17 knocker
12 dosing screw 18 seal washer
13 motor mounting 19 dosing hopper screw ring
14 dosing nozzle heated
15 drum empty switch with adjusting screw and LED
The dosing screw (12) meters the chlorine through the heated dosing nozzle (14) to the dissolving
system. If the drum empty switch (15) is indicating, app 1 kg chlorine is left in the hopper. The knocker
(17) gives a hit to the hopper wall at each dosing motor run cycle so supporting flowing of the granules.
Dosing performance is adjusted by the switch 4 at front fascia, see para "Start up operation".
WDT Operating Instruction GRANUDOS 25/45/100 (S41C-06/12) page 8 of 27
2.4 Acid Dosing
The acid required for pH-control is metered by the peristaltic pump to
the
flushing water via the dosing injector. As the pH-control is vital for
the correct function of the chlorine/ORP-control, chlorine dosing is
stopped if the level switch at the supply carboy lance indicates container
empty. Besides this primary effect of controlling the pH-value, the dosing
of the acid at this point ensures an always clean dissolving system and
tubing, blockage of the injection valve is avoided.
As acid use one on base of sulphuric acid (37 – 50 %), please do not
use concentrated hydrochloric acid for this job as that penetrates the
peristaltic hose and will destroy the pump head. Diluted hydrochloric acid
may be not strong enough for the neutralisation job. Please note that using
dry acid (sodium bisulphate) 20% (= maximum concentration) is equivalent
to a only 10% sulphuric acid.
Maximum dosing performance is app. 3 l/h and is set as for chlorine.
The dosing cycle set for chlorine is valid for acid too.
2.5 Dissolving System
20 21 22 23
32
26
34 33
31
24
27
29
20 pressure switch 28 allocation rinsing water
21 floating valve 29 level control switch
22 flushing tank 30 union bush with washer nozzle
23 flushing tube 31 outlet ball valve d25
24 flow monitoring 32 supply connection d25 with filter
25 venturi nozzle 33 fitting to connect pressure gauge
26 circulation pump 34 overflow tube
27 cyclone mixing/dissolving chamber
The dissolving water is normally supplied from before or from behind the filter. There must be a
sufficient supply pressure to avoid dry running and/or cavitation on the booster pump, at
28
25
30
WDT Operating Instruction GRANUDOS 25/45/100 (S41C-06/12) page 9 of 27
least 0.2 bar. The pump pressure is controlled by the pressure switch (20) fitted on top of the pump. At
a pressure below the set switch pressure by sucking air or at pressure drops the machine stopps, lamp 1
& 2 will burn. At works 1,5 bar is set.
The supply water is divided in the allocation rinsing water (28) at the discharge of the booster pump
(26), one way leading to the flushing tank (22), the other branch directed to the venturi nozzle (25),
where the water is sucked together with the dosed chemicals out of the flushing tank. The supply water
flow is controlled by means of a floating valve (21) and a flow switch (24), the latter being installed in
the suction tube of the venturi. To mix the chemicals and to ensure the complete dissolving of the
chlorine granules a cyclone mixing chamber (27) is fitted after the venturi.. To ensure that chlorine and
acid do not come into contact with each other in the open tank part of the dissolving assembly a
sophisticated control system is installed:
- metering of the two chemicals is regulated with pauses between the metering intervals
(para 2.6.3, page 11 “
- power supply for chlorine and acid dosing motors are connected by a relay system so that
only one or none of them can get power (24VDC) and dose chemical.
- flow switch (24) , level switch (29), pressure switch (20) supervising water supply and flow
conditions. If any non-compliance with the given limits occurs, the GRANUDOS will be
switched off.
Dosing Performance - Dosing scheme
”).
2.6 Control System with program GR S41
The microprocessor based control of the GRANUDOS has three functions:
- Contains the circuit self check and dosing and test programmes
- Function control and interruption display (1 green + 4 red LED). If any
interruption is displayed, the GRANUDOS dosing is switched off.
- All faults activate the fault remote control.
2.6.1 Operation elements
operation elements on front plate
- mains switch
- main fuse 3,15 Aslow
- 1 programme switch for test- and
Operation programmes
- 2 knobs to adjust the wanted dosing
performance for chlorine and acid
- 1 LED green to monitor operation
- 4 LED red to monitor irritations
operation elements inside on control plate:
2 fuses 500 mAslow,
Code-switch to select programme alteratives
The control system is enclosed within a dust
proof and splash proof housing (IP 65). External switches and fault remote indication are to be connected
at the back of the control panel.
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