Converter Operation; Maximum Peak Voltage At The Motor Terminals; Table 6-6 Maximum Peak Voltage At The Motor Terminals - Siemens SIMOTICS FD 1LH1 Operating Instructions & Installation Instructions

Electrical connection
6.5 Connecting the auxiliary circuits
6.5.5

Converter operation

The following chapter is relevant only if the machine has been ordered for converter operation.
Note
The order number shows whether the machine was ordered for converter operation. In this
case, digits 1, 2, 3 or 4 is located at the 6th position of the order number.
Dangerous voltage via the converter
As long as the feeding converter is switched on, or the DC link of the converter is not
discharged, there can be a voltage at the motor terminals even when the rotor is not moving.
The voltage is up to 1000 V, depending on the converter type.
Ensure that the five safety rules (Page 15) are followed before working on the motor.
6.5.5.1

Maximum peak voltage at the motor terminals

The maximum peak voltage values at the motor terminals are listed in the table as limit values
for the insulation system:
Table 6-6
Rated motor voltage [V]
≤ 500 V
> 500 to 690 V
NOTICE
Insulation damage caused by cable reflections
Cable reflections can double the voltage load at the motor or at the terminals. This can
damage the insulation system and result in complete destruction of the machine.
94
WARNING
Maximum peak voltage at the motor terminals
Maximum peak voltage at the motor terminals Û
Conductor - conductor
1500 V
Rise time 0.5 μs
2250 V
Rise time 0.4 μs
Conductor - ground
1100 V
Rise time 0.5 μs
1500 V
Rise time 0.4 μs
Operating Instructions 04/2016
max
DC link
750 V
1125 V
SIMOTICS FD 1LH1