control panel retrofit & replacement of DOL startersSometimes small changes can make a big difference. Here one of our customers was using star delta starters to control water flow. The starters worked flat out all the time, which didn't offer any level of control and so wasn't energy efficient. By modifying the panel with relays, the operation can now be controlled by VSDs. This not only offers an exact level of control, but will vastly reduce energy costs - and pay back the costs of the drives and modifications - continuing to make savings for as long as the inverters are in operation.