KOLLMORGEN AKD-T00306-NBAN-0000 INPUT SERVO DRIVE
KOLLMORGEN AKD-T00306-NBAN-0000 INPUT SERVO DRIVE
Functional description
WhenSTOfunction(SafeTorqueOff)is not needed, thentheinput STOmust beconnecteddirectly with+24V.
Thefunction is thenbypassedandcannot beused. If theSTOfunctionis inuse, thentheinput STOmust becon
nectedtotheexit of asecurity control orasafety relay, whichat least meets therequirements of PLd, CAT 3
according to ISO13849(connectiondiagram: => p. 57). Possiblestates of thedrivereferringtoSTOfunction:
WhenSTOfunctionis engagedduringoperationby separatinginput STOfrom 24V, themotorslows downwith
out control andthedrive displays thefault F602
Signal diagram (sequence)
Thediagram below shows how touseSTOfunctionforasafedrivestopandfault freeoperationof thedrive.
1. Brakethedriveinacontrolledmanner(speedsetpoint = 0V).
2. Whenspeed=0rpm,disablethedrive(Enable= 0V).
3. ActivatetheSTOfunction(STO= 0V)
Control circuit (example)
Theexampleshowsacontrolcircuit withtwoseparatedwork areasconnectedtooneemergencystopcircuit
(mainssupply circuit:=> p.58). Foreachworkarea, “safestop” ofthedrivesis switchedby aprotectivescreen.
Thesafety switchgearsusedintheexamplearemanufacturedby Pilzandfulfillat leastthePLdaccordingtoISO
13849-1orSILCL2accordingtoIEC62061. Safetyswitchgears fromothermanufacturersmay alsobeused
First Method:
1. Stopdrive, withsetpoint 0V. Keepdriveenabled.
DANGER:Do notenter hazardous area!
2. ActivatetheSTOfunctionforexampleby openingprotectivescreen(voltageat X1/30V).
3. Thefault contact opens, thenet contactorreleases, andthedrivedisplays fault F602.
Second Method:
1. Stopall drives, withsetpoint 0V, disabledrive.
2. ActivatetheSTOfunction, forexample, by openingprotectivescreen(voltageat X1/30V)
3. Thedrivedisplays warningn602.
6.17.8.4 Mains supply circuit (example)
Corresponding control circuit => p. 57.
Shock-hazard Protection
6.18.1 Leakage Current
Leakagecurrent viathePE conductorresults from thecombinationof equipment andcableleakagecurrents.
Theleakagecurrent frequency patternincludes anumberof frequencies, whereby theresidual-current circuit
breakers definitively evaluate the 50 Hz current. Forthis reason, the leakage current cannot bemeasuredusinga
conventional multimeter.
As aruleof thumb, thefollowingassumptioncanbemadeforleakagecurrent onourlow-capacity cables at a
mains voltageof 400V, dependingontheclock frequency of theoutput stage:
I
leak = n x 20 mA + L x1mA/mat8kHzclockfrequencyattheoutput stage
leak = n x 20 mA + L x2mA/mata16kHzclockfrequencyattheoutput stage
(whereIleak=leakage current, n=numberof drives, L=lengthof motorcable)
At othermains voltageratings, theleakagecurrent varies inproportion to the voltage.
Example:2x drives + a25mmotorcableat aclock frequency of 8kHz:
2x 20mA+25mx1mA/m=65mAleakagecurrent.
Thefollowing measures canbeusedtominimizeleakagecurrents:
l Reducethelengthof theenginecable.
l Uselow-capacity cables (=> p. 40).
6.18.2 Residual Current Protective Device (RCD)
In conformity with IEC 60364-4-41–Regulations forinstallation andIEC 60204–Electrical equipment of machin
ery, residual current protective devices (RCDs) canbeusedprovidedtherequisiteregulations arecompliedwith.
TheAKDis a3-phasesystemwithaB6bridge. Therefore, RCDs whicharesensitivetoall currents must be
usedinordertodetect any DC fault current. Refertothechapterabovefortheruleof thumbfordeterminingthe
leakage current.
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