Danfoss VLT AQUA Operating Instructions Manual

Also see for vlt aqua: Instructions Design guide Instruction manual Operating instructions Design guide

27-7* Connections Example27-70.0 Relay 1 [1] Drive 2 Enable27-70.1 Relay 2 [2] Drive 3 EnableTable 6.7 Master Drive Settings, 27-7* Connections6.1.3 Follower Drive SettingsFollower drives must be configured for open loopoperation with basic settings as described in 6.1.1 BasicSettings.Configure only one of the followers and to copy thesettings by using the LCP.Open Loop Settings (Follower) Example/Remarks1-00 Configuration Mode [0] Open Loop3-02 Minimum Reference 03-03 Maximum Reference 50 (Hz)3-15 Reference 1 Source [7] Pulse Input 29Table 6.8 Open Loop Settings (Follower)The terminal 29 is used as a pulse input for the referencesignal and must be scaled.5-** Digital In/Out (Follower) Example/Remarks5-02 Terminal 29 Mode [0] Input5-13 Terminal 29 Digital Input [32] Pulse Input5-50 Terminal 29 Low Frequency 0 (Hz)5-51 Terminal 29 High Frequency 5000 (Hz)5-52 Term. 29 Low Ref. Value 05-53 Term. 29 High Ref. Value 50 (Hz)5-10 Terminal 18 Digital Input StartTable 6.9 5-** Digital In/Out (Follower)6.1.4 Sleep ModeThe following describes how to configure the frequencyconverter for de-staging the last variable speed pump inapplications with more than one frequency converter.The necessary steps for the configuration are:1. Set parameter 27-34.01 higher than the minimumspeed in 4-11 Motor Speed Low Limit [RPM]/4-12 Motor Speed Low Limit [Hz] to enable sleepfunction (setting it to zero will disable thefunction).2. Set 27-21 Override Limit to wake up theapplication.After wake up the pump with the least running hoursstarts.NOTICEIf the master drive does not wake up properly, thefrequency converter is not able to reach its de-stagingspeed and the delays in parameter group 27-** have tobe adjusted.Stage ON [Hz] Stage OFF [Hz]Stage 1 48.5 (i.e. parameter 2732.1) 30 (i.e. parameter 2734.1)Stage 2 48.5 (i.e. parameter 2732.2) 40 (i.e. parameter 2734.2)Stage 3 - (i.e. parameter 2732.3) 42 (i.e. parameter 2734.3)Table 6.10 Example Settings for 27-3*, 3 Pumps withSleep Mode Enabled• “Stage X” refers to the stage the cascade isrunning in (stage 1 ⇒ cascade is running in stage1, only 1 pump is running)• Pumps 2 and 3 are started on 48.5 Hz• Pump 3 is stopped on 42 Hz, Pump 2 is stoppedon 40 Hz and Pump 1 is stopped on 30 Hz• It might be necessary to fine adjust the stageon/off speeds to optimise the energyconsumption, if not auto tuned. It isrecommended to use Auto Tune Staging Speedsby enabling the feature in 27-30 Auto TuneStaging Speeds.NOTICEParameter 2732.3 is irrelevant in this case, because thereis nothing left to stage on in stage 3.Configuration Examples VLT® AQUA Drive MCO 101/MCO 10242 MI38C402 - VLT® is a registered Danfoss trademark66