Method in a milking system for creating a required vacuum level and computer program products

A method for creating a required vacuum level within a milking system, said milking system comprising at least two variable speed vacuum pumps, said method comprising:

• utilizing a first variable speed vacuum pump, of a plural vacuum pump system within said milking system, for creating the required vacuum level within said milking system,
• monitoring the vacuum level requirement within the milking system, and when the vacuum level requirement of the milking system is such that the speed of said first variable speed vacuum pump reaches a first speed threshold, then starting a second variable speed vacuum pump, said first speed threshold being less than a maximum speed of said first variable speed vacuum pump, and
• running said first and second variable speed vacuum pumps in parallel for creating the required vacuum level,
• wherein said running of said first and second variable speed vacuum pumps in parallel comprises running said first and said second variable speed vacuum pumps based on a common control signal with the common control signal maintaining said first and second variable speed vacuum pumps at an equal speed, the equal speed being variable while running the pumps in parallel to create the required vacuum level.