29
Overview of 17S Internal Electronics, continued
Internal Power
Section The Internal power section of the 17S drive include s the following:
lPower input: A rectifier bridge directly connected to the three-phase earthed
supply system, integral power input filter and inrush current limiting circuit.
lMotor power output: PWM current-controlled voltage source IGBT - in v erter with
isolated current measurement
lRegen circuit: Dynamic distribution of Regen power between several drives on
the same DC Link circuit. An internal Regen resistor is standard; optional
external Regen resistors are available as required by your application.
lDC Link voltage: 300...700 Vdc, nominal (900 Vdc, intermittent) and can be
operated in parallel.
DC Link
Capacitor
Reconditioning
If the servo drive has been stored for longer than one year, then the DC Link
capacitors will have to be reconditionned as follows:
Integrated Safe
Electrical
Separation
The 17S drive ensures safe electrical separation (in accordance with EN 50178)
between the power input/motor connections and the signal electronics through the
use of appropriate insulation-creepage distances and electrical isolation. The drive
also provides soft-start characteristics, overvoltage and ov ertemperature d etection,
short-circuit protection and input phase-failure monitoring. When using BPH series
servo motors in conjunction with Schneider’s pre-assembled cables, the drive also
monitors the servo motor for overtemperature.
Keypad The operation of the keypad on the front panel of the 17S drive is described in
System Operation. These two keys can be used (as an al ternative to using the PC)
to enter the SERCOS address for the drive
Step Action
1 Ensure that all electrical connections to the drive are disconnected.
2 Provide 230 Vac, single-phase power to connector XOA (terminals L1/L2) on the
servo drive for about 30 minutes to recondition the capacitors.