Grundfos KJ1 GU02 User manual

r e v i s i o n 0.0
GU02 Manual
750-18, Jangnok-Dong, Gwangsan-Gu
Gwangju, Korea
Tel: [phone] (Re .)

Monitoring Unit – GU02
Prepared by.
Rev. No. Rev1.0
Date. 12-Nov-13
Page. 2 / 7
1. General
GU02 is complete monitoring unit, it can monitor the pump status by detecting motor overheating, high bearing
temperature, seal leakage and moisture in junction box and if there is any problem you can recogni e it by alarm
sound.
GU02 can detect
1) Moisture incursion into the junction box
2) Overheat of stator windings (U,V,W)
3) High temperature of bearing (Upper and Lower)
4) Seal leakage
GU02 can be mounted in MCC (motor control center) without the need for a power transformer since it has an
inbuilt voltage regulating device.
2. Sensors inside the Motor
The installed sensors are as following;
1) Thermal Protectors in Stator Windings
- For 90 kW(120 Hp) and above, three PT 100 ohm type thermal protection sensors are embedded in each
phase of stator windings to monitor the stator winding temperature.
- The three thermal protect devices can be connected in parallel (6 wires to connect to GU02) or in series (2
wires to connect).
- The setting temperature of GU02 can be adjusted easily without service technician; the recommended
temperature setting is 125 degrees C.
- For the 75kW (100Hp) and below motors, one bimetal type thermal protection sensor is installed in stator
winding and the inherent setting temperature of the bimetal is 125degree C.
- If three bimetal type sensors are required these can be installed as an option. It will be connected in series
so 2 wires will be connected to the GU02.
2) Leakage Sensor
- One electrode type seal leakage sensor is installed on the seal chamber.
- If the primary seal leaks and water penetrates into the oil chamber, the resistance of the
electrode changes to below 5 Kilo ohm.
- Under normal conditions, the resistance value of the electrode sensor is greater than
10 mega ohm.

Monitoring Unit – GU02
Prepared by.
Rev. No. Rev1.0
Date. 12-Nov-13
Page. 3 / 7
3) Bearing Temperature Sensor
- For 90 kW (120 HP) and above motors, a lower bearing temperature sensor is embedded as standard. An
upper bearing sensor can be embedded as an optional.
- The bearing temperature sensor is platinum transducer type. The temperature of bearing sensors can be
adjusted easily.
4) Moisture Sensor in Junction Box
- One electrode type moisture sensor is installed in the junction box to monitor any water entry into the
junction box.
In the event that the outer sheath of the cable is damaged, water may enter the junction box by capillary
action (wicking), causing drop of the motor insulation resistance drop.
If water enters into the junction box, the resistance value of the moisture sensor will drop to 5 kilo ohms.
3. Nomenclature
① Power switch
② Set button
③ Reset button
④ Temperature up key
⑤ Temperature down key
⑥ Stator winding temperature display window
⑦ Bearing Temperature display window
①
⑧
⑥ ⑦ ⑨
④
⑤
② ⑩
③

Monitoring Unit – GU02
Prepared by.
Rev. No. Rev1.0
Date. 12-Nov-13
Page. 4 / 7
⑧ Phase indication lamp for stator windings; R for U, S for V, T for W
⑨ Bearing indication lamp: H for upper bearing, L for lower bearing
⑩ Status indication lamp
4. Operating & Setup Sequence
GU02 unit is installed in the MCC(motor control center) and accordingly MCC manufacturer should prepare
the wiring in the panel for GU02 accordingly.
Therefore if the panel is not supply scope of Grundfos, it is strongly recommended to supply GU02 unit to
the selected MCC manufacturer.
The GU02 unit is sophisticated and sensitive instrument with many useful functions. It should be handled
the correct ways and connected in accordance with the instructions.
Please follow the below procedure to set up GU02.
1) First of all, check the input voltage to GU02 whether it is in the range of AC 90 ~ 240VAC, 50/60H ,
6W Max.
2) Follow the below procedure to set the parameters of operation.
① Turn on the power switch of GU02.
② Wait to disappear the value of basic SET Number on display window.
③ Press the 'Set' button for 5 seconds when the basic SET Number disappears. The basic SET Number
will be displayed on the left display window again.
④ Select new Set Numbers by using up/down key
⑤ Press the “SET” button.
⑥ Show “Cht_” (C with one digit number) on the screen.
⑦ Select the “Cht_” by using up/down key
⑧ Press the “SET” button and the set up procedure is complete.
* Remarks
The "C_" settings are a timing mechanism. The C1 means the thermals in each phase are checked separately
In every one second, C2 means every two seconds, C3 means every three seconds, etc.

Monitoring Unit – GU02
Prepared by.
Rev. No. Rev1.0
Date. 12-Nov-13
Page. 5 / 7
Input
Set Mode TP-B TP-R TP-S TP-T BS-H BS-L SS MS GS
SET-1 ○ ○
○ ○ ○
SET-2 ○ ○
○ ○ ○ ○
SET-3 ○ ○
○ ○ ○
SET-4 ○ ○
○ ○ ○ ○
SET-5 ○
○ ○
○
○ ○ ○
SET-6 ○
○ ○ ○
○
○ ○
SET-7 ○
○ ○ ○ ○ ○ ○ ○
SET-8 ○
○ ○
○
○ ○
SET-9 ○
○ ○ ○
TP(B) : Thermal protection (Bimetal type sensor)
TP(R) : One thermal protection device (PT100 ohm thermistor) in one of the stator windings
TP(R,S,T) : Three thermal protection devices (PT100 ohm thermistor) one in each phase of the stator
windings
BS(L) : Bearing temperature detector (Lower bearing)
BS(H) : Bearing temperature detector (Upper bearing)
SS : Seal leakage detector
MS : Moisture detection sensor in junction box
GS : Pressure detector for gear oil pressure in gear box(Where gear box is used)
3) After setting the mode, set the temperature for thermal protection sensor and follow the below
procedure for the bearing temperature
① Press 'Set' key, and then signal lamp for TP(R), TP(S), TP(T), BS(H), BS(L) will blink in turn.
② Select the sensor what you want to set and press the 'Set' key once again.
③ Select the required temperature by using the up/down keys.
④ After select the temperature, press the 'Set' key to complete the temperature set up.
⑤ Repeat the above procedure for the sensors to complete the temperature setting.
4) Connect all sensor wires to the right position of terminal.
There is identification mark on the terminal block of GU02 to connect in right ways.
5) Turn on the bu er switch to provide an audio alarm on signal failure.
Then set up procedure is complete.
6) Turn on the main power switch of MCC to start operation of pump.
7) If one of the sensors is activated, the bu er will give alarm sound and the operator can find which sensor
is activated by observing which lamp is blinking.
After hear the alarm sound, switch off MCC and correct the fault. If the cause of fault is not completely
removed, the alarm bu er will keep give alarm sound and the warning signal of the bu er wouldn’t be
disappeared.

Monitoring Unit – GU02
Prepared by.
Rev. No. Rev1.0
Date. 12-Nov-13
Page. 6 / 7
The bu er will stop only when the fault is corrected. After that the signal will be restored to the correct
level.
8) Press reset button of GU02 when the fault is rectified completely.
All conditions will go return to the original condition.
5. Connection
1 2 43 65 7 8 10 911 12 13 1514
2625 27 28 3029
TP-R TP-S TP-T BS-H BS-L COM COM TP-B GS COM MS SS
Input 1(PT-100 Sensor)
16 191817 20 21 22 23 24
Input 2(Contact) Input 3(Electrode)
TP-R BS-L
4~20mA Analog Output Alarm Output(Digital,Normal:Open)
TP BS SS MS GS COM Total Alarm
(4~20mA=>0~250 C) (Relay Contact 2A/250VAC) (Relay Contact 2A/250VAC)
(50~60Hz)
(AC90~240V)
POWER
F.G
Normal:Open
6. Dimension
168
158
63 69
170
168
158
63 69
170

Monitoring Unit – GU02
Prepared by.
Rev. No. Rev1.0
Date. 12-Nov-13
Page. 7 / 7
7. Panel Cut Out

GRUNDFOS A/S
DK-8850 Bjerringbro . Denmark
Telephone: [phone]
www.grundfos.com
993829670314
ECM: 1223585
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