Introduction
Single axis devices
12
192-
120102N23 2016-04
2.7.3.
Current on the mains PE (leakage current)
This product can cause a direct current in the protective lead. If a residual current
device (RCD) is used for protection in the event of direct or indirect contact, only
a type B (all current sensitive) RCD is permitted on the current supply side of this
product . Otherwise, a different protective measure must be taken, such as
separation from the environment by doubled or enforced insulation or separation
from the mains power supply by means of a transformer. Respect the supplier's
instructions.
Mains filters do have high leakage currents due to their internal capacity. An
internal mains filter is usually integrated into the servo controllers. Additional
discharge currents are caused by the capacities of the motor cable and the motor
winding. Due to the high clock frequency of the power output stage, the leakage
currents do have high-frequency components. Please check if the FI protection
switch is suitable for the individual application.
If an external mains filter is used, an additional leakage current will be produced.
The figure of the leakage current depends on the following factors:
Length and properties of the motor cable
Switching frequency
Operation with or without external mains filter
Motor cable with or without shield network
Motor housing grounding (how and where)
Remark:
The leakage current is important with respect to the handling and usage safety of
the device.
A pulsing leakage current occurs if the supply voltage is switched on.
Please note:
The device must be operated with effective grounding connection, which must
comply with the local regulations for high leakage currents (>3.5 mA).
Due to the high leakage currents it is not advisable to operate the servo drive with
an earth leakage circuit breaker.
2.7.4.
Supply networks
This product is designed for fixed connection to TN networks (TN-C, TN-C-S or
TN-S). Please note that the line-earth voltage may not exceed 300VAC.
When grounding the neutral conductor, mains
voltages of up to 480VAC are permitted.
When grounding an external conductor (delta
mains, two-phase mains), mains voltages (external
conductor voltages) of up to 240VAC are
permitted.
Devices which are to be connected to an IT network must be provided with a
separating transformer. Then the devices are operated locally as in a TN network.
The secondary sided center of the separating transformer must be grounded and
connected to the PE connector of the device.