{"id":117803,"date":"2023-08-18T12:08:30","date_gmt":"2023-08-18T10:08:30","guid":{"rendered":"https:\/\/www.velasolaris.com\/handbuch\/variable-speed-pump-controller\/"},"modified":"2025-10-21T13:40:11","modified_gmt":"2025-10-21T11:40:11","slug":"variable-speed-pump-controller","status":"publish","type":"handbuch","link":"https:\/\/www.velasolaris.com\/en\/handbuch\/polysun-designer\/controllers\/variable-speed-pump-controller\/","title":{"rendered":"Variable Speed Pump Controller"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\" id=\"h-variable-speed-pump-controller-for-fresh-water-stations\">Variable Speed Pump Controller for Fresh Water Stations<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The speed-controlled pump is the key to efficiently regulating the fresh water station in thermal systems. By adjusting the flow rate in the heating water circuit according to the hot water demand, it ensures a constant outlet temperature at the <a href=\"https:\/\/www.velasolaris.com\/en\/handbuch\/polysun-designer\/transfer-circuit\/hydraulic-components\/plate-heat-exchangers\/\">plate heat exchanger <\/a>that is tailored to the demand. The pump can be controlled either by a fixed setpoint temperature or by a variable setpoint temperature linked to the operating status of the system. This enables the fresh water station to supply hygienically safe hot water at all times while minimising energy losses and increasing user comfort.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-variable-speed-pump-controller\">Variable Speed Pump Controller<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The variable-speed pump controller is a two-channel controller regulating status and flow rate of the pump of the fresh-water station.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The controller has 4 (plus 2 optional) analogic inputs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The controller has 2 digital and analogic outputs.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"Block-Diagram\" style=\"font-size:30px\"><strong>Block Diagram<\/strong> of a Variable Speed Pump Controller for Fresch Water Station<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The block diagram shows the employed measuring and controlling values<\/p>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-7387b849 wp-block-group-is-layout-flex\">\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/10\/image202-2.png\" alt=\"\" class=\"wp-image-71699\"\/><figcaption class=\"wp-element-caption\">Figure: block diagram: measuring values of variable speed pump controller&nbsp;<\/figcaption><\/figure>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"Controller-Input-Mask-\u201cFixed-Temperature-Setting\u201c\" style=\"font-size:30px\"><strong>Controller Input Mask \u201cFixed Temperature Setting\u201c<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-7387b849 wp-block-group-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/10\/image203-1-1024x716.png\" alt=\"\" class=\"wp-image-71702\"\/><figcaption class=\"wp-element-caption\">Figure: controller input mask \u201cFixed temperature setting\u201c<\/figcaption><\/figure>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">With this setting the pump of the fresh-water station cuts in as soon as hot water is tapped. Pump speed is adjusted so that the output temperature on the secondary-side can reach 52\u00b0C. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"Controller-Input-Mask-\u201dVariable-Temperature-Setting\u201c\" style=\"font-size:30px\"><strong>Controller Input Mask \u201dVariable Temperature Setting\u201c<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-7387b849 wp-block-group-is-layout-flex\">\n<figure class=\"wp-block-image size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/10\/image204-1024x716.png\" alt=\"\" class=\"wp-image-71704\" style=\"width:761px;height:532px\"\/><figcaption class=\"wp-element-caption\">Figure: controller input mask \u201cVariable temperature setting\u201c<\/figcaption><\/figure>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">With this setting the pump of the fresh-water station cuts in as soon as hot water is tapped. Pump speed is adjusted so that the output temperature on the secondary-side is as high as the hot water demand temperature setting plus 5\u00b0C.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"Input-Values\" style=\"font-size:30px\"><strong>Input Values<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\" id=\"Inlet-Temperature-of-Primary-Side-[\u00b0C]\">Inlet Temperature of Primary Side [\u00b0C]<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The value shows the point where the inlet temperature of the primary side is measured. Enter pipe temperature immediately before the plate heat exchanger or, e.g., the temperature of the tank connection.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\" id=\"Inlet-Temperature-of-Secondary-Side-[\u00b0C]\">Inlet Temperature of Secondary Side [\u00b0C]<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The value shows the point where the inlet temperature of the secondary side is measured. Enter cold water temperature or pipe temperature immediately before the plate heat exchanger of secondary side.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\" id=\"Flow-Rate-of-Secondary-Side-[l\/h]\">Flow Rate of Secondary Side [l\/h]<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The value refers to the flow rate of the reference side. In fresh-water modules the value refers to the nominal flow rate of hot water withdrawal. <a><\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\" id=\"Second-Flow-Rate-of-Secondary-Side-[l\/h]\">Second Flow Rate of Secondary Side [l\/h]<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">As in flow rate of secondary-side a second flow rate may be entered. In case of the fresh-water station with circulation it is the circulation flow rate.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\" id=\"K*A-Plate-Heat-Exchanger-[W\/K]\">K*A Plate Heat Exchanger [W\/K]<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">This value refers to the heat transfer properties and the heat transfer surface of the heat exchanger. Data are defined by the manufacturer.<a><\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\" id=\"Variable-Temperature-Setting-[\u00b0C]-(Optional)\">Variable Temperature Setting [\u00b0C] (Optional)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The temperature that should be reached&nbsp; at the outflow of the plate heat exchanger, e.g. the temperature setting of the hot water demand.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"Description-of-Control-Parameters\" style=\"font-size:30px\"><strong>Description of Control Parameters<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\" id=\"Description\">Description<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The \u201cdescription\u201c value enables the user to assign controllers any name of number. Polysun assigns a consecutive number as a standard feature as different controllers are added chronologically in the hydraulic system.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\" id=\"Sign-of-Output\">Sign of Output<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The term \u201cNormal\u201c means that digital output signals are controlled as intended in the switching logics. (Example: if X3+X4&gt;0 the output of&nbsp; pump 1 is positive)<br>The term \u201cInverted\u201d that the digital output signals are multiplied -1.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\" id=\"Definition-of-Temperature-Setting\"><br>Definition of Temperature Setting<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fixed temperature setting<br>The components connected to the controller are adjusted so that the entered fixed temperature setting can be reached at the output of the plate heat exchanger on the secondary side.<\/li>\n\n\n\n<li>Variable temperature setting<br>The components connected to the controller are adjusted so that the entered variable temperature setting can be reached at the output of the plate heat exchanger on the secondary side allowing for the relevant temperature shift.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\" id=\"Definition-of-Temperature-Shift\">Definition of Temperature Shift<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>For example. 5 [K]<br>The temperature shift value enables to adjust temperature drops in the plate heat exchanger and&nbsp; pipe cooling after the plate heat exchanger. If the value is positive the outflow temperature will be increased by this value. If the value is negative the outflow temperature will be decreased by this value.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"Output-Values\" style=\"font-size:30px\"><strong>Output Values<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\" id=\"Pump-Status-[%]\">Pump Status [%]<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">This digital output refers to the pump to be controlled, e.g. the pump of the fresh-water station. Select the relevant pump from the list.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\" id=\"Pump-Flow-Rate-[l\/h]\">Pump Flow Rate [l\/h]<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">This analogic output adjusts the pump flow rate so that the desired temperature level can be reached on the secondary side of the plate heat exchanger. In the process the plate heat exchanger shows a temperature drop from the primary to the secondary side. This temperature drop may be corrected through the temperature shift.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The output is active only if the option &#8220;Flow rate setting&#8221; has been selected in the field &#8220;Flow rate controlled&#8221; for the pump to be controlled<\/strong>; otherwise pump settings will have priority over the analogic control outputs. Double click on the pump to change\/check the settings.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Select the relevant pump from the list.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"Overview-of-Control-Dependencies\" style=\"font-size:30px\"><strong>Overview of Control-Dependencies<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Table: Control-dependencies of the fixed and variable temperature settings<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>Outputs<\/td><td>Parameter<\/td><td>Tip<\/td><td>Inputs<\/td><td>Function<\/td><\/tr><tr><td rowspan=\"5\">Y1: Pump Status<br>Y2: Pump flow rate<\/td><td rowspan=\"5\">Fixed temperature setting<\/td><td rowspan=\"5\">Adjust&nbsp; pump to<br>&#8211; Flow rate settings &#8211;<\/td><td>X1: Primary-side inlet temperature [\u00b0C]<\/td><td rowspan=\"5\">Y1=0 if X3 + X4 = 0<br>Y1=1 if X3 + X4 &gt; 0 Y2= f(X1, X2, X3 + X4, X5)&nbsp;<\/td><\/tr><tr><td>X2: Secondary-side inlet temperature [\u00b0C]<\/td><\/tr><tr><td>X3: Secondary-side flow rate [l\/h]<\/td><\/tr><tr><td>X4: Second flow rate of secondary-side [l\/h]<\/td><\/tr><tr><td>X5: K*A Plate heat exchanger[W\/K]<\/td><\/tr><tr><td rowspan=\"6\">Y1: Pump Status<br>Y2: Pump flow rate<\/td><td rowspan=\"6\">Variable temperature setting<\/td><td rowspan=\"6\">Adjust pump to<br>&#8211; Flow rate settings &#8211;<\/td><td>X1: Primary-side inlet temperature [\u00b0C]<\/td><td rowspan=\"6\">Y1=0 if X3 + X4 = 0<br>Y1=1 if X3 + X4 &gt; 0 Y2= f(X1, X2, X3 + X4, X5, X6)<\/td><\/tr><tr><td>X2: Secondary-side inlet temperature [\u00b0C]<\/td><\/tr><tr><td>X3: Secondary-side flow rate [l\/h]<\/td><\/tr><tr><td>X4: Second flow rate of secondary-side [l\/h]<\/td><\/tr><tr><td>X5: Variable temperature setting [\u00b0C]<\/td><\/tr><tr><td>X6: K*A Plate heat exchanger [W\/K]<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"author":19748,"featured_media":0,"parent":117529,"menu_order":44,"comment_status":"closed","ping_status":"closed","template":"","class_list":["post-117803","handbuch","type-handbuch","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.0 (Yoast SEO v28.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Variable Speed Pump Controller for Fresh Water Stations Guide<\/title>\n<meta name=\"description\" content=\"Learn how the variable speed pump controller optimizes fresh water stations in thermal systems, ensuring efficient hot water delivery.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.velasolaris.com\/en\/handbuch\/polysun-designer\/controllers\/variable-speed-pump-controller\/\" \/>\n<meta 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