Danfoss VLT HVAC Basic Drive Programming Manual

Also see for VLT HVAC: Instructions Operating instructions Design guide Instruction Operating instructions

Contents

Danfoss VLT HVAC Basic Drive Programming Manual Manual pdf 70 page image

3.15 Main Menu - Application Functions -Group 223.15.1 22-4* Sleep ModeThe purpose of sleep mode is to allow FC101 to stop itself insituations where the system is satisfied. This will save energy,and keeps system from being over-satisfied (too highpressure, water cooled too much in cooling towers, buildingpressurisation problems). This is also important for a reasonthat some applications cannot allow the FC101 to adjustmotor down to low speed. This might damage pumps, causeinsufficient lubrication in gearboxes, and make fans unstable.Sleep controller has two important functions - ability to go tosleep at right time, and ability to come out of a sleep modeat right time. The goal is to keep FC101 in sleep mode aslong as possible to avoid cycling the motor on and offfrequently, and at the same time keep the controlled systemvariable in acceptable range.The sequence when running sleep mode in Open Loop:1. The motor speed is less than 22-47 Sleep Speed [Hz]and the motor has been running longer than22-40 Minimum Run Time.2. FC101 ramps the motor speed down to1-82 MinSpeed for Function at Stop [Hz].3. FC101 activates 1-80 Function at Stop. Thefrequency converter is now in sleep mode.4. FC101 compares the speed setpoint with22-43 Wake-Up Speed [Hz] to detect wake upsituation.5. The speed setpoint is greater than22-43 Wake-UpSpeed [Hz] and the sleep condition has last for morethan 22-41 Minimum Sleep Time. The frequencyconverter is now out of sleep mode.6. Go back to speed open loop control (ramp motorspeed up to the speed setpoint).The sequence when running sleep mode in Closed Loop:1. The motor speed is less than22-47 Sleep Speed [Hz]and the motor has been running longer than22-40 Minimum Run Time.2. FC101 activates the boost function (add the22-45 Setpoint Boost to the setpoint). The frequencyconverter is now in sleep boost mode.3. The new setpoint has been achieved or sleep boosthas been running for longer than 22-46 MaximumBoost Time)4. FC101 ramps the motor speed down to 1-82 MinSpeed for Function at Stop [Hz].5. FC101 activates 1-80 Function at Stop. Thefrequency converter is now in sleep mode.6. FC101 compares process setpoint (without boost)with feedback to detect wake up situation.7. The error (setpoint - feedback) is greaterthan22-44 Wake-Up Ref./FB Diff and the sleepcondition has last for more than22-41 MinimumSleep Time The frequency converter is now out ofsleep mode.8. FC101 goes back to closed Loop control.NOTESleep Mode will not be active when Local Reference is active(set speed manually by means of arrow buttons on theLCP).Does not work in Hand-mode. Auto set-up in open loopmust be carried out before setting input/output in closedloop.22-40 Minimum Run TimeRange: Function:10.0 s* [0.0 - 600.0 s] Set the desired minimum running time forthe motor after a start command (digitalinput or Bus) before entering Sleep Mode.22-41 Minimum Sleep TimeRange: Function:10.0 s* [0.0 - 600.0 s] Set the desired Minimum Time for stayingin Sleep Mode. This will override any wakeup conditions.22-43 Wake-Up Speed [Hz]Range: Function:10.0 Hz* [0.0 - 400.0 Hz]22-44 Wake-Up Ref./FB DiffRange: Function:10.0 %* [0.0 - 100.0%]Only to be used if 1-00 Configuration Modeis set for Closed Loop and the integrated PIcontroller is used for controlling thepressure.Set the pressure drop allowed inpercentage of set point for the pressure(Pset) before cancelling the Sleep Mode.Parameters VLT HVAC Basic Drive Programming GuideMG.18.B1.02 - VLT® is a registered Danfoss trademark 693 3