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68 E300 Design Guide
Issue Number: 1
N
Any signal cables which are carried inside the motor cable i.e. motor thermistor), will pick up large pulse currents via the cable capacitance. The
shield of these signal cables must be connected to ground close to the point of exit of the motor cable to avoid noise current spreading through the
control system.
N
The Safe Torque Off (STO) Drive enable terminal is a positive logic input only. It is not affected by the setting of Input Logic Polarity (F02)
N
The common 0 V from analog signals should, wherever possible, not be connected to the same 0 V terminal as the common 0 V from digital signals.
Terminals 3 and 11 should be used for connecting the 0V common of analog signals and terminals 21, 23 and 30 for digital signals. This is to prevent
small voltage drops in the terminal connections causing inaccuracies in the analog signals.
The control circuits are isolated from the power circuits in the drive by basic insulation (single insulation) only. The installer must ensure
that the external control circuits are insulated from human contact by at least one layer of insulation (supplementary insulation) rated for
use at the AC supply voltage.
If the control circuits are to be connected to other circuits classified as Safety Extra Low Voltage (SELV) (e.g. to a personal computer), an
additional isolating barrier must be included in order to maintain the SELV classification.
If any of the digital inputs (including the drive enable input) are connected in parallel with an inductive load i(.e. contactor or motor brake)
then suitable suppression (i.e. diode or varistor) should be used on the coil of the load. If no suppression is used then over voltage spikes
can cause damage to the digital inputs and outputs on the drive.
Ensure the logic sense is correct for the control circuit to be used. Incorrect logic sense could cause the motor to be started unexpectedly.
Positive logic is the default state for the drive.
When reading a parameter set from a SMARTCARD, SD card to the drive during setup this can result in the control I/O firstly defaulting
and then changing to the configuration on the SMARTCARD,SD card. Ensure during this process all control terminals are removed from
the drive and any SI-I/O module to prevent uncontrolled operation of external devices and the risk of damage to the system.
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