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3.6 Capacitor module with 4.1 mF or 20 mF Description Capacitor modules are used to increase the DC link capacitance. This allows brief power failures to be buffered and the braking energy can be stored. The modules differ as follows: module with 4.1 mF ––> is used as dynamic energy storage device module with 20 mF ––> is used to buffer power failures The capacitor modules have a ready display, which is lit above a DC link voltage of approx. 300 V. This also allows an internal fuse failure to be identified. However, the charge status cannot be reliably monitored. The 4.1 mF module does not have a pre–charging circuit, and, as it is directly connected to the DC link, it can absorb dynamic energy and thus be used as a dynamic energy storage device. The charge limits of the line supply modules must be taken into account for these modules. The pre–charging for 20 mF modules is realized via an internal pre–charging resistor in order to limit the charging current and to de–couple the module from the central pre–charging. For this module, no energy can be dynamically absorbed, as the pre–charging resistor limits the charge current. If the power fails, a diode couples this capacitor battery to the system DC link so that the capacitors buffer the DC link. Note The capacitor modules may only be used with the SIMODRIVE 611 supply infeed modules. The modules are suitable for internal and external cooling. Siemens AG 2001 All Rights reserved SIMODRIVE 611 (PJ) 6SN1197–0AA00 Ausgabe 02.2000 (vorab 30.01.01) 02.01 3.6 Capacitor module with 4.1 mF or 20 mF LED “READY” operating display, is lit from VDC link > 300 V Capacitor module 100 mm wide or 300 mm wide P600 VDC link M600 PE Fig. 3-1 Capacitor module Siemens AG 2001 All Rights reserved 6SN1197–0AA00 Ausgabe 02.2000 (vorab 30.01.01) SIMODRIVE 611 (PJ) 02.01 3.6 Capacitor module with 4.1 mF or 20 mF Technical data Table 3-1 Technical data of the capacitor modules Designation Module 4.1 mF Calculation examples 20 mF Order No. 6SN1 112–1AB00–0BA0 6SN1 112–1AB00–0CA0 Voltage range VDC 350 to 750 V Storage capacity w = 1/2 x C x U2 VDC steady–state (examples) 600 V ––> 738 Ws 680 V ––> 948 Ws Temperature range 0 C to +55 C Weight approx. 7.5 kg approx. 21.5 kg Dimensions WxHxD 100 x 480 x 211 [mm] WxHxD 300 x 480 x 211 [mm] VDC steady–state (examples) 600 V ––> 3 215 Ws 680 V ––> 4 129 Ws Note: As a result of the internal pre– charging resistor, the voltage at the capacitors is only approx. 0.94 x VDC. The storage capacity in dynamic operation and for regenerative braking is calculated as follows: w = ½ x C x (V2DC link max – U2DC link n) Formula: Assumptions for the example: Capacitance of the capacitor battery C = 4.1 mF Nominal DC link voltage VDC link n = 600 V Max. DC link voltage VDC link max = 695 V ––> w = ½ x 4.1 x 10–3 F x ((695 V)2 – (600 V)2) = 252 Ws For the storage capacity of the capacitors when the power fails, the following applies: w = ½ x C x (V2DC link n – V2DC link min) Formula: Assumptions for the example: Capacitance of the capacitor battery C = 20 mF Nominal DC link voltage VDC link n = 600 V Max. DC link voltage VDC link max = 350 V ––> w = ½ x 20 x 10–3 F x ((567 V)2 – (350 V)2) = 1990 Ws The storage capacity increases to 2904 Ws for a DC link voltage of 680 V. ! Important VDC linkmin must be 350 V . At voltages below 350 V, the switched–mode power supply for the electronics shuts down. Siemens AG 2001 All Rights reserved SIMODRIVE 611 (PJ) 6SN1197–0AA00 Ausgabe 02.2000 (vorab 30.01.01) 02.01 3.6 Capacitor module with 4.1 mF or 20 mF The possible buffer time tÜ is calculated using the output DC link power PDC link as follows: tÜ = w / PDC link Dynamic energy The DC link capacitors should be considered as battery. The capacitance and the storage capacity are increased by the capacitor module. The energy flow should be determined in order to evaluate the capacitance required for a specific application. The energy flow depends on the following: all of the moved masses (weights) and moments of inertia velocity, speed (and its change, acceleration, deceleration) efficiencies, mechanical system, gearbox, motor, inverter (driving/braking) duration of the buffer time, bypass DC link voltage and the permissible change, output value upper/lower limit value. In practice, often, there is no accurate data available about the mechanical system. If the mechanical system data are determined using approximate/rough calculations or estimated values, the capacitance of the DC link capcitors required can only be determined by making the appropriate tests during the commissioning phase. The energy for dynamic operations is obtained as follows: The following applies for a drive braking or accelerating within time Tv from one speed/velocity to another: w = ½ x P x tV for rotating drives, with MMot x (nMot max – n Mot min) P = ––––––––––––––––––––––––– x ηG 9 550 for linear drives, with P= FMot x (VMot max – VMot min) x 10–3 x ηG with ηG: Braking ηG= ηM x ηWR Acceleration ηG = 1/(ηM x ηWR) w [Ws] Energy P [kW] Motor output tV [s] Duration of the operation MMot [Nm] Max. motor torque when braking or accelerating FMot [N] Max. motor force with braking or accelerating nMot max [RPM] Max. speed at the beginning or end of the operation nMot min [RPM] Max. speed at the beginning or end of the operation Siemens AG 2001 All Rights reserved 6SN1197–0AA00 Ausgabe 02.2000 (vorab 30.01.01) SIMODRIVE 611 (PJ) 02.01 3.6 Capacitor module with 4.1 mF or 20 mF vMot max [m/s] Max. velocity at the beginning or end of the operation vMot min [m/s] Min. velocity at the beginning or end of the operation ηG Efficiency, overall ηM Efficiency, motor ηWR Efficiency, inverter The torque M and the force F are dependent on the moved masses, the load and the acceleration in the system. If there is no accurate data about these factors, then generally the nominal/rated data is used Engineering information It is preferable that the capacitor module is mounted at the righthand end of the system group. It is connected through the DC link busbars. Module with 20 mF (width: 300 mm) E/R LT LT 100 Module with 4.1 mF (width: 100 mm) Fig. 3-2 Capacitor module mounting slot Several capacitor modules can be connected in parallel depending on the line supply infeed used. For 4.1 mF capacitor modules, the charging limit of the line supply infeed should not be exceeded as sum. Literature: Table 3-2 NC 60 Section, engineering information Application possibilities of the capacitor modules Infeed unit Capacitor modules which can be connected UE 5 kW None UE 10 kW / I/R 16 kW max. 1 x 4,1 mF and additional max. 3 x 20 mF UE 28 kW / I/R 36–120 kW max. 4 x 4,1 mF and additional max. 3 x 20 mF Siemens AG 2001 All Rights reserved SIMODRIVE 611 (PJ) 6SN1197–0AA00 Ausgabe 02.2000 (vorab 30.01.01) 02.01 3.6 Capacitor module with 4.1 mF or 20 mF Charge–up, discharge times, discharge voltage Before carrying–out any commissioning or service work, it should be checked that the DC link is in a no–voltage condition. Table 3-3 Charge–up/discharge times, discharge voltage Capacitor module Charge–up, each module Discharge time, for each module to 10 % of the DC link voltage at 750 V DC 4.1 mF As for the power modules approx. 24 min 20 mF approx. 2 min approx. 30 min If there is a pulsed resistor in the system, in order to shorten the discharge time for a DC link fast discharge, the line supply voltage can be disconnected through terminals X221:19 and 50 (jumpers). ! Important In order to avoid damage to the infeed circuit of the NE modules, when energizing X221, terminal 19/50, it must be ensured that terminal 48 of the NE module is de–energized (electrically isolated from the line supply). The checkback (feedback) contact from the main contactor of the NE module must be evaluated to check that this has really dropped–out (X161 terminal 111, terminal 113, terminal 213). Siemens AG 2001 All Rights reserved 6SN1197–0AA00 Ausgabe 02.2000 (vorab 30.01.01) SIMODRIVE 611 (PJ)