Grundfos Cu301 Water Stops Then Starts Again
General
1. What is the SQ and SQE?
An SQ is a 3" submersible pump bench-marked against the best four" competitors and with a number of additional integrated protective features.
two. Why can't we just build a 3" stainless steel product similar to the Grundfos SPA?
There are three means in which the pressure level tin be increased in a centrifugal pump:
- larger diameter
- more than pump stages
- increased speed
When we want a iii" pump we cannot apply particular i. Particular 2 will make the pump extremely long. We have therefore called to increment the speed as the best solution to give higher pressure level to 3" pumps.
3. Does the standard SQ model incorporate a frequency converter?
Yes, the motor has a congenital-in frequency converter to requite the pump loftier speed, resulting in high performance.
4. What is the difference betwixt SQ and SQE?
The SQ is a single speed pump and the SQE is a variable speed pump which needs a control box to operate with variable speed and to monitor and suit its features.
five. What is the CU300 and CU301?
The CU300 and CU301 are both control boxes to monitor and adjust the features on the SQE.
The SQE together with the CU300 control box provides advanced features such every bit constant force per unit area, monitoring by modem, pump status read out, advanced force per unit area settings and more.
The SQE together with the CU301 control box and a small tank and pressure sensor, all bachelor in one package, provides an like shooting fish in a barrel to install and operate adaptable abiding pressure level system.
6. What is the R100?
The R100 is a remote control needed to operate the CU300 control box.
7. Can a SQE be installed without a CU300 or CU301 control box?
Yes, but the pump will then operate as a normal SQ single speed pump. At any time, a CU300 or CU301 can exist installed afterward in lodge to provide the client with boosted features.
Product Data
1. Which flow volumes will it handle?
Nominal flows upwardly to vii m3/h and max. flows upward to ix m3/h.
2. How many stops/starts can the pump make an hour in a normal working life?
There are no limitations, it can start immediately after stop.
3. Does SQ accept a max. number of restarts congenital in, before manual reset?
No, it has no max. number of restarts, and information technology will continue having automatic restart.
4. Is a non-return valve integrated in the SQ?
Yes, and it is also replaceable.
5. How many pressure/curve settings are at that place on SQE/SQE-NE?
Between min. curve (seven.000 rpm) and max. bend (ten.700 rpm) for the respective model, information technology can be adjusted at intervals of 100 rpm.
6. What is the minimum flow required?
Up to 30°C it works without any flow past the motor (free convection).
Up to 40°C information technology requires a menstruation of 0.15 grand/sec. past the motor.
7. What is the maximum number of starts/hour?
SQ has no limitations, it tin can restart immediately after cease, continuously.
Applications
ane. Can it be used with a generator?
SQ has been designed and tested for use with generators. Still, it should but be used with generators with a ability size which is min. 10% larger than the power consumption (P1) of the respective motors.
Grundfos recommends not to start the pump until the generator is running.
2. Is SQ mainly for calorie-free domestic applications?
SQ has been bench-marked against the best premium 4" pumps and motors and can be used for intermittent as well as continuous pumping without problems. There is even an AISI 316 version with special composite and safety for demanding industrial and environmental applications.
three. Exercise I notwithstanding have to utilise a pressure tank? If yes, what size?
You however need a force per unit area tank. The size tin can be adamant from your present experience with our iv" range.
Alternatively you lot can use SQE with CU300 or CU301 control box for constant force per unit area regulation, and an 8-litre tank volition be adequate.
4. Can yous guarantee that SQ can work in horizontal position? What near the heat created on the side touching the lesser of the tank or lake bed?
If you lot pump clean water and the side of the pump does not touch annihilation, a cooling sleeve is not required. If the h2o contains solid particles, we recommend to use a cooling sleeve in horizontal installations.
5. For dewatering, please explain how to employ the SQE feature for constant water level regulation.
We refer to our Product Information and Data Booklet which describe this in item.
Installation
1. Do I accept to utilize an R100 with SQ, SQE and SQE-NE?
No, not necessarily; SQE and SQE-NE could in principle function like an SQ, if you do not make special settings/changes by ways of a CU 300 or R100.
For SQ you lot cannot use R100.
2. What extra electrical protection is needed? Do I need a pulsating DC blazon of ELCB circuit breaker? - If yes, why? - Can Grundfos supply?
If the pump is continued to an electric installation where an globe-leakage circuit breaker (ELCB) is used for boosted protection, the type of excursion billow installed must trip when world fault currents with DC content (pulsating DC) occur. Other types could exist disabled by the SQ/SQE motor.
This is a component you get from the installer/wholesaler. Grundfos does not supply circuit breakers.
3. Does SQE have to be in water to set the pressure requirement?
If not, how is it done?
No, you lot can connect it to CU 300 and change parameters with R100, without starting the motor.
4. What happens if SQ is installed without "basis"?
"Ground" is important to people'due south safe, and a must to the pump.
5. What happens if SQ is installed without "neutral"?
In social club to pump, SQ must exist continued both to neutral and ane phase.
6. What should exist washed if SQ replaces an old 3-phase installation?
Make sure that neutral is available, and connect neutral and i of the three phases from the installation to the motor.
Protective features
one. How do I protect SQ against dry-running?
SQ pumps have built-in dry-running protection, without the use of a low level sensor. A preset power value ensures cut-out of the pump in case of lack of water in the well, thus preventing motor burnout.
The software merely checks the power consumption. When it becomes too low, information technology stops the pump for 5 minutes. After this period, automatic restart is attempted.
SQE will have the power cut-out value programmed by means of R100 during installation. The recommended values can be seen in the instruction manual. In instance of changed performance curve, a new cutting-out value must exist calculated by means of the PC program "SQE - variable speed calculation".
Service
1. Can SQ exist serviced?
SQ pumps and motors are fully repairable. A range of spare parts are available. No special tools are required for the replacement.
2. Tin can I exam the motor myself without whatever special equipment?
The motor must be loaded (east.g. coupled to a pump with counter pressure).
3. Does SQ have a replaceable motor plug?
Aye.
4. Is motor megging possible?
No, the congenital-in over-voltage protection volition brusque-excursion the megging voltage.
5. Is it possible to check the motor resistance (ohm)?
No, it is not possible, but the motor volition non be damaged by the voltage from the ohmmeter.
six. Are any special tools required to service SQ/SQE?
If yous want to be able to fill problem-shooting of SQE, you need a
CU 300 and an R100.
vii. You cannot measure the insulation/winding resistance!
No, there is a born over-voltage protection which will be brusk-circuited.
viii. Electronics in the well means pulling up the pump in example of problems. Any water leakage or moisture that gets into the electronics ways a pull!
The electronics are completely encapsulated in stainless steel, and tested at 15 bar ambient pressure. Electronics could mean that you don't have to pull up the pump, due east.k. to adapt it to changing well weather. Parameters can exist changed by means of R100 while the pump is in the well.
Reliability
1. Which cooling atmospheric condition utilize to SQ?
The cooling of SQ is excellent. In case of free convection, it will operate in liquid temperatures upward to xxx°C, horizontally too every bit vertically, without the need of a cooling shroud. At temperatures up to 40°C, a flow past the motor is required.
two. What is the life expectancy of SQ compared with a Grundfos SPA?
SQ has been bench-marked against premium 4" products, meaning that the pump has been designed so that its life is like to that of an SPA.
3. Is SQ a plastic pump with a stainless steel outer casing?
The complete motor is made of stainless steel. The pump has stainless sleeve and discharge. Inside information technology is made of polyamide with xxx% glass reinforcement. Each impeller is equipped with tungsten carbide/ceramic bearings, which makes it extremely resistant confronting sand vesture.
four. Is anything special done to bank check the reliability of the electronic module after it leaves the product line?
Reliability Stress Screening (RSS) is a procedure which is introduced at product startup in guild to fulfil the market (client) requirement for reliability in the field. See "Nordtest Method NE ELEC" and IEC 1163-1.
v. What about the EMC regulations, does SQ fulfil these?
Yes, SQ meets the EMC regulations regarding electric noise back on the mains, and radio noise to the surroundings.
six. How will SQ react on large voltage fluctuations?
Nominal voltage is 1 x 200-240 5, -x%/+6%, and it will protect itself by shutting off below 150 V and above 280 V, with automatic restart when the voltage gets within the limits once again.
7. Does SQ have soft start?
Yes, it has an integrated soft starter reducing the starting current and thus giving the pump polish and steady dispatch.
8. Electronics create racket in the mains supply!
SQ meets the EMC regulations concerning electrical racket back to the mains supply and radio noise to the surroundings.
9. What is the lifetime of the permanent magnets? Won't they derate speedily?
The lifetime of the motor is comparable with that of a conventional Ac motor. The magnets accept been tested to keep their ability for minimum 10 years at 120°C, and this temperature is clearly above what they will be exposed to in the motor. As well, the magnets are completely encapsulated in stainless steel.
Source: https://www.envisupply.com/environmental/Grundfos/FAQ.htm
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