1. Where are the ZDS products produced?
  2. What happens when you run a pump beyond the right-hand side of the curve?
  3. What happens when you run a pump on the left-hand side of the curve?
  4. How will the ZDS motor react to voltage fluctuations?
  5. Do ZDS motors have a maximum number of restarts built in before a manual reset is required?
  6. How reliable is the capacitor built in to the 2-wire motors?
  7. What is/causes water hammer?
  8. Can ZDS Pumps operate in a horizontal position?

 

1. Where are the ZDS products produced?

All ZDS products are produced and designed in Italy.

 

2. What happens when you run a pump beyond the right-hand side of the curve?

Operating a pump beyond the right-hand side of the performance curve is another way of saying that the pump is producing more flow than it is designed for. In other words, the pump is undersized for what the system actually requires. Operating a pump in this way can damage both the motor and pump end. A pump should be operated within its minimum and maximum flow limits at all times, and ideally as closely as possible to the optimum efficiency point to ensure its longevity and to minimize energy consumption.

 

3. What happens when you run a pump on the left-hand side of the curve?

Running the pump on the left hand side of the curve means that the pump is running at a high pressure and at a low or no flow condition. High pressure in the pump drives down the impeller stack and increases pressure on the motor bearings. In extreme conditions this will cause failure of both the motor and pump end. If the flow is less than the pump's minimum flow requirement, the fluid in the pump may overheat and damage the pump. A pump must be operated within its minimum and maximum flow limits at all times, and ideally the pump should be operated as close as possible to the best efficiency point to ensure long life of the product and minimize energy consumption.

 

4. How will the ZDS motor react to voltage fluctuations?

Nominal voltage can be read on the nameplate with these variations: - 10%/+6%. The motor will protect itself by shutting off below and above these limits, with automatic restart when the voltage gets within them again.

 

5. Do ZDS motors have a maximum number of restarts built in before a manual reset is required?

The motor will restart itself an unlimited number of times if a fault occurs. Once the fault condition clears it will operate normally

 

6. How reliable is the capacitor built in to the 2-wire motors?

The capacitor is guaranteed for a minimum of 30 000 hours of operation. Over the last 3-years ZDS Group has had a failure rate of less than 0,2% with the capacitor used in the 2-wire motors. Click here to see 2-wire Complete Solutions.

 

7. What is/causes water hammer?

Water hammer is a pressure surge caused by a rapid change of water velocity in a piping system. Water hammer is often accompanied by a sound comparable to a hammer hitting a pipe, hence the name. In water well systems, water hammer is typically caused when

 

a) the check valve installed in the drop pipe nearest the pump is more than 9 m above the standing water level, or

b) the check valve installed in the drop pipe leaks while the next check valve above holds.

 

In both situations a partial vacuum is created in the drop pipe. On the next pump start, water moving at very high velocity fills the vacuum and strikes the closed check valve and the stationary water in the pipe above it, causing a pressure surge and hydraulic shock. This shock can split pipes, break joints and damage the pump and/or motor. When discovered, the system should be shut down and the pump installer contacted to correct the problem.

 

8. Can ZDS Pumps operate in a horizontal position?

ZDS pumps with either a ZDS motor or a Franklin motor can operate in any position from horizontal through vertical. For your convenience, ZDS has specially designed The KIOS for horizontal use in water tanks. Click for more.