Grundfos Magna 32-120 Operating instructions

Service instructions
MAGNA Series 2000
Magna 32-120, 40-120, 50-60, 50-120, 65-60, 65-120
50/60 Hz
1~
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96558929 0804 GB
1. Type identification .......................................................................................................................2
1.1 Nameplate......................................................................................................................................................2
1.2 Type key ..........................................................................................................................................................2
2. Dismantling and assembly .......................................................................................................... 3
2.1 Dismantling the pump................................................................................................................................4
3. Fault correction............................................................................................................................. 5
3.1 Fault finding................................................................................................................................................... 5
3.2 Fault correction procedure.........................................................................................................................8
3.3 Fault indications via R100 fault log .......................................................................................................14
4. Winding resistance..................................................................................................................... 15
The pump must be serviced by a qualified person.
Service must be carried out in accordance with local regulations and accepted codes of good practice.

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1. Type identification
1.1 Nameplate
1.2 Type key
TM02 8834 0904
Pos. Description Pos. Description
1 Type designation 8 Production code (year + week)
2 Product number 9 Country of origin
3 Model designation 10 Direction of rotation
4 Rated voltage and number of phases 11 Rated frequency
5 Maximum full-load current 12 Liquid temperature limit
6 Maximum input power 13 Enclosure class
7 Mark of conformity 14 Insulation class
Example MAGNA (D) 32 -120 F (N) Model: E
Type range
Twin-head pump
Nominal flange diameter [mm]
Maximum head [dm]
Pump housing with flanges
Pump housing of stainless steel
32-120F
P/N: 96513625
I1/1 (A) P1(W)
0.15
1.55 345
22
PC: 0116
Model : E
1 230-240 V 50/60 Hz
IP 44
TF 110
MIN
MAX
MIN
MAX Class F
MAGNA
1
2
3
4
5
614
13
12
11
10
9
8
7
Made in Germany

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2. Dismantling and assembly
Before dismantling
• Disconnect the electricity supply to the motor.
• Close the isolating valves, if fitted, or drain the system, as the pumped liquid may be burning hot and
under high pressure.
Before assembly
Gaskets and O-rings should always be replaced when the pump is overhauled.
• Clean and check all parts.
•OrdernewO-ringkits.
• Replace defective parts by new parts.
The pump must be serviced by a qualified person.
Service must be carried out in accordance with local regulations and accepted codes of good practice.

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2.1 Dismantling the pump
2.1.1 Changing the position of the terminal box
1. Remove the inspection screw pos. 1 and the four screws pos. 2 in the stator housing, see Fig. 1.
2. Turn the stator housing pos. 3 to the position required.
If the stator housing has been prised/lifted off the pump housing, continue with point 2 in 2.1.2 Replacing
the stator unit including the rotor unit.
3. Fit the four screws and the inspection screw.
Fig. 1 Changing the position of the terminal box
2.1.2 Replacing the stator unit including the rotor unit
1. Remove the inspection screw pos. 1 and the four screws pos. 2 in the stator housing, see Fig. 1.
2. Lift off the stator housing pos. 3.
3. Remove the rotor and the O-ring from the pump housing or stator housing.
4. Check that the O-ring pos. 6 is intact. If the O-ring is damaged, it must be replaced.
5. Fit the rotor and the O-ring on the pump housing.
6. Put a tee key or a long screwdriver through the stator and hold the rotor while fitting the stator on the
pump housing. See Fig. 2.
The purpose is to protect the O-ring, as otherwise the magnetic force will cause the rotor to jerk up in the
stator.
Fig. 2 Holding the rotor
7. Turn the stator housing pos. 3 to the position required.
8. Fit the four screws and the inspection screw.
TM02 5506 3402TM02 5507 3402
2
3
1
5
4
6

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3. Fault correction
3.1 Fault finding
Fault finding should always start with a check that the external conditions for correct function are OK. This is
done by checking:
• that the mains supply is in accordance with the data on the nameplate,
• that the installation was carried out according to the installation and operating instructions,
• that the external on/off switch has been connected correctly,
• that the desired setpoint signal is available,
• that the requested sensor signal is available.
3.1.1 Printing of data registers
The Grundfos R100 remote control enables the printing of status for the data registers by means of a Hewlett
Packard infrared printer.
The purpose of this is to ensure that the service technician can print out the data registers before starting the
fault finding so that this print stating the original fault information can be enclosed, in case the product is re-
turned to Grundfos.
The pump must be serviced by a qualified person.
Service must be carried out in accordance with local regulations and accepted codes of good practice.

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The following figure shows an example of a print of MAGNA Series 2000 pump data registers.
3.1.2 Fault log
MAGNA Series 2000 pumps feature a fault log function:
• The fault log function memory can recall the five latest faults.
• The fault log can be read out via R100.
• The faults log cannot be reset.
• States the type of fault, code and time since the fault arose.

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3.1.3 Fault reading via R100
Possible fault and log can be read via R100 in the GENI menu and/or in the OPERATION menu.
Fault indications
The following fault indications can appear:
• Pump blocked.
• Internal fault
•Undervoltage
•Overvoltage
•Overtemperature
• Module fault (fault in the module fitted (GENI, LON...))
• Fault in module communication.
The fault indication can also be reset in this display. If the fault has not disappeared when attempts are made
to remove the fault indication, the indication will return in the display when communicating with the pump.
Alarm log
The alarm log shows the fault code, the fault indication and for how many minutes the pump has been con-
nected to supply voltage since the fault arose. The five last fault indications are shown in the alarm log.
List of fault code priority, see 3.3 Fault indications via R100 fault log.
Fig. 3 If the pump is faulty, the cause will appear in the display.
Fig. 4 Example of alarm log
Time since the fault arose
Fault
code
Fault

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3.2 Fault correction procedure
The following fault correction procedure is based on indications by the green and red indicator lights on the
terminal box of the MAGNA Series 2000 pump. The next two pages give a complete overview of the possible
signal lights combinations. Remedy for some of the situations is further elaborated on the three next pages (
A1, A2, B1, B2, B3, C1, C2).
Legend for signal lights:
= signal light is off.
= signal light is permanently on
= signal light is flashing
Signal lights
Description Explanation Remedy/reference
Green Red
Pump is not running. Voltage supply to pump has been cut off. Re-establish correct volt-
age supply.
Normal operation
Pump is running. 1. Normal operational state. The pump is keeping up
the pressure according to the setpoint set.
–
2. Pump is running but not as the expected pump type.
Cause: Configuration error
Check the automatic con-
figuration of the terminal
box.
See A1.
3. Pump is running but making noise.
Cause may be:
- Air in the pump
- Inlet pressure too low.
Vent the pump.
Increase the inlet pressure.
4. Pump is running at too low or high pressure. • Is the pressure set cor-
rect?
• Check the external 0-
10 V signal.
See A2.
Normal operational stoppage
Pump is not running. Pump has been stopped...
-by means of the operating button -
-viaR100 -
- via Grundfos GENIbus -
- by the pump start/stop function.
(Input on terminals STOP - is open meaning that
5 VDC can be measured across the terminals.) -
Pump is not running. Pump has been stopped due to:
1. Supply voltage outside specified range - automatic
restart.
Re-establish correct volt-
age supply.
2. Pump blocked or overloaded - manual restart. Remove blockage/reduce
load.
3. Frequent restarts -
manual restart after stop.
The pump starts and stops at short intervals until it
stops permanently. Replace the terminal box.
4. Fatal fault -
Cause may be:
- Terminal box defective
- Stator winding defective
Automatic and manual restart have been factory-set.
- Replace the terminal box.
- Replace the stator.

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Normal operation + indication of fault
Pump is running at nor-
mal performance.
Pump has been stopped due to fault and has restarted
automatically.
1. GENI module (if installed)
Max., min., 0-10 V inputs do not react. Fault in internal communi-
cation to the module, see
B1.
2. LON module (if installed).
Pump does not react to changes from the LON input. Fault in internal communi-
cation to the module, see
B1.
3. Setpoint changes cannot be stored. See B2.
4. No signal is registered from the HALL sensor in the
stator.
See B3.
Normal operational stoppage + indication of fault
Pump is not running. Pump has been stopped...
-by means of the operating button
-viaR100
- via Grundfos GENIbus
- by the pump start/stop function.
Pump can run, however, even if there has previously been
a fault.
1. GENI module (if installed).
Max., min., 0-10 V inputs do not react. Fault in internal communi-
cation to the module, see
B1.
2. LON module (if installed).
Pump does not react to changes from the LON input. Fault in internal communi-
cation to the module, see
B1.
3. Setpoint changes cannot be stored. See B2.
4. No signal is registered from the HALL sensor in the
stator.
See B3.
Legend for signal lights:
= signal light is off.
= signal light is permanently on
= signal light is flashing
Signal lights
Description Explanation Remedy/reference
Green Red

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A1
A2
Description Pump is running but not as the expected pump type.
Explanation Configuration error
In case the terminal box cannot identify the stator type, the pump will run default as a 40-120 or a 65-120.
Check/remedy Check by means of R100 which pump type the terminal
box has registered:
1. Switch R100 to service mode.
2. Go into the GENI menu in the display on the right.
3. Enter code 13.
R100 will now show which pump type the terminal box has registered. Check that the indication corresponds to
the actual pump type.
In case of error in the stator coding, the indication will be "ERR".
Is the pump type correct?
YES:
NO:
Fault is not due to a configuration error, but
possibly to a setting error or a system fault.
Check the stator coding according to the
drawing.
See C2.
In new R100 software updates the pump type can be read in the start-up display.
Description The twin-head pump does not control its performance optimally.
Explanation Configuration error
The terminal box uses a wrong set of parameters.
Check/remedy As the right and the left pump head do not have the same hydraulic performance, there are a right and left set of
parameters.
Correct configuration is carried out by means of the GENI modules where the Master module must always be fit-
ted on the right pump head. (Terminals X and Q are short-circuited.) The modules must be product number
605945VO1 or higher.
If no GENI modules are used on the twin-head pumps, the configuration can be carried out by means of R100
Turbo.
Description Pump is running at too low or high pressure.
Explanation Setpoint setting is incorrect.
Check/remedy 1. Is an external setpoint signal connected?
NO:
YES:
Set setpoint according to system specifications.
Check the connection to the GENI module and the external setpoint signal. Note that the termi-
nals MIN - must be closed for the setpoint setting to work.
2. Does the pump speed vary (listen to the pump) according to the input signals on terminals 10 V - ?
YES:
NO:
Pump is OK.
Proceed to point B1.