Danfoss VLT Series Operating Instructions Manual

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Danfoss VLT Series Operating Instructions Manual Manual pdf 34 page image

27-54 Alternate at Time of DayOption: Function:Alternate at Time of Day allows selecting a specific time of day for alternating pumps. The time isset in parameter 27-55. Alternation at Time of Day requires the real time clock to be set.[0] * Disabled[1] Time of Day27-55 Alternation Predefined TimeRange: Function:1:00* [00:00 – 23:59] Alternation Predefined Time is the time of day for pump alternation. This parameter is only availableif parameter 27-54 is set to Time of Day.27-56 Alternate Capacity is <Range: Function:0% (Off)* [0% (Off) – 100%] Alternate Capacity is < requires the lead pump to be operating below this capacity before time basedalternation will be allowed to take place. This feature ensures that alternation only takes place whenthe pump is running below a speed where interruption in operation will not affect the process. Thisminimizes the system disturbance caused by alternations. The value is entered as a % of the ca-pacity of pump 1. Alternate Capacity is < operation may be disabled by setting this parameter to0%.27-58 Run Next Pump DelayRange: Function:0.1s* [0.1s – 5s] Run Next Pump Delay is a delay between stopping the current lead pump and starting the next leadpump when alternating lead pumps. This provides time for the contactors to switch while bothpumps are stopped.1.8.8 Connections, 27-7*Parameters for configuring relay connections.27-70 RelayOption: Function:Standard Relay P27-70 is an array parameter used to setup the function of the option relays. Depending on whichoption is installed only the available relays will be visible. If Extended Cascade controller is installed,relay 10-12 will be visible. If Advanced Cascade controller is installed relay 13-20 will be visible. Inboth cases, the standard relays (Relay1 and Relay2) will be accessible as well as the relays in theB-option MCB-105 (if that option is installed in combination with advanced cascade).To setup the function of each relay, choose the specific relays and then choose the function. If thefunction option: Standard Relay is choosen, the relay can be used as general purpose relay and thewanted function can then be setup in parameter P5-4*.1 Extended and Advanced Cascade ControllerOption VLT® Operating Instructions34 MI.38.C3.02 - VLT® is a registered Danfoss trademark1