DIGIVEX Little Drive Servoamplifier
23
PVD 3530 GB 01/2005
4. ELECTRICAL CONNECTIONS
4.1 General Wiring Requirements
4.1.1 Appliance handling
Please refer to the safety instructions given at the beginning of this booklet. It is strongly
recommended that personnel wait for the 7-segment display, situated on the front panel, to go off
before undertaking any intervention of the servoamplifier or servomotor.
4.1.2 Electromagnetic compatibility
EARTHING
Comply with all local safety regulations concerning earthing.
Utilize a metal surface as an earth reference plane (e.g. cabinet wall or assembly grid). This
conducting surface is termed the potential reference plate. All the equipment of an electrical
drive system is connected up to this potential reference plate by a low impedance (or short
distance) link. Ensure the connections provide good electrical conduction by scraping off any
surface paint and using fan washers. The drive will then be earthed via a low impedance link
between the potential reference plate and the earth screw at the back of the DIGIVEX Little
Drive. If this link exceeds 30 cm, a flat braid should be used instead of a conventional lead.
CONNECTIONS
Do not run low-level cables (resolver, inputs/outputs, NC or PC links) alongside what are termed
power cables (power supply or motor). Do not run the power supply cable and the motor cables
alongside one another otherwise mains filter attenuation will be lost. These cables should be
spaced at least 10 cm apart and should never cross, or only at right-angles.
Except for the resolver signals, all low-level signals will be shielded with the shielding connected
at both ends. At the DIGIVEX Little Drive end, the shielding is made continuous by the Sub-D
connector mechanism.
The motor cables are limited to the minimum functional length. The yellow and green motor
cable lead must be connected to the box or front panel terminal block with the shortest possible
link.
This usually means shielded motor cable is not required. Chokes may also be inserted into the
motor phase leads.
OTHER MEASURES
Self-inducting components must be protected against interference: brakes, contactor or relay
coils, fans, electro-magnets, etc.
This manual was downloaded on www.sdsdrives.com
+44 (0)117 938 1800 - [email protected]
