Grundfos vfd manual

Features such as automatic cascade control ensure the highest possible system energy efficiency. As the only system on the market, Control MPC knows exactly which — and how many — pumps to control, and will optimise performance and minimise energy consumption based on user-supplied pump curve data. With Control MPC, there are no communication barriers. Features such as standby pump allocation, forced pump changeover and dry-running protection help to increase your system reliability and decrease downtime and costly maintenance.

Choose from 25 toxic sensors, 3 PID sensors with a 9. The Professional Plus is the world's most versatile water quality meter. Interchangeable cables and multiple accessories allow a single instrument to be quickly changed for use in the field as a handheld meter, for low flow sampling, or in the laboratory.

Did you know that Equipco also sells environmental field supplies? The best way to start looking for problems in the system is to take a system-wide approach. This sounds a bit simplistic, but let's look at the approach.

When diagnosing fault tripping in a drive system, begin with the basic preventative maintenance overview. Laying out the steps of a good PM schedule is essential. These steps are as follows:. Check the system with a good visual inspection.

Look for running or dripping water, high humidity, excessive temperature extremes, excessive dirt or contaminant debris, and corrosive agents located near or under the equipment. Here's a good rule of thumb: If you would not place a television near the drive because of the physical environment, then the drive may have problems. If the drive does not have a sealed enclosure to handle rough environmental conditions, care must be taken to protect the drive assembly. Clean the drive of dirt, dust and corrosion.

Depending on the environment, there may be significant problems with contaminants. The drive should be relatively clean. Do not allow significant amounts of dirt to build up on the heatsink of the drive. This may prevent sufficient cooling of the drive semiconductors and may damage cooling fans and cause overtemperature problems.

Check all wiring connections for tightness. Loose connections in the wiring of the drive to the incoming power and to the motor are a major cause of drive failure.

As the drive performs day in and day out, the constant cycle of increasing in temperature and subsequent cooling can cause the connections to loosen over time. Depending on the manufacturer of the unit, the wire used may be highly stranded for flexibility. This type of wire may be difficult to keep tight. Loose connections can contribute to overcurrent trips, destroy IGBTs, cause input rectifiers to fail, and burn terminals on contactors and switches.

Current levels can differ a bit more from phase to phase without causing too much concern, but there is the possibility of finding one line completely dead.

Remember, most drives today can still run the motor with one phase of the incoming power missing. These are the basic first steps to determining the problem with any given drive. This process should be done on a periodic basis. If these procedures are followed, most problems can be eliminated and the drive should deliver trouble-free service for many years. Modern drives are amazingly reliable. With advances in semiconductor technology and increased buss capacitor performance, many of the problems that previously plagued drive manufacturers are all but gone.

All of the major drive manufacturers build a relatively sturdy and reliable drive. Minimum internal failures ever occur. Problems outside of the drive now contribute to a large number of drive failures and are a major cause of nuisance tripping.

So how does one look for the source of the problem? Think of your drive system as a group of areas working in harmony. When the system has a problem, divide the system into pieces to determine where to start looking. The major areas are as follows:. Problems with the input to the drive can cause a number of failures.