3 Installation
3.5 Electrical installation
DB1 variable frequency drive
11/20 MN040031EN
Eaton.com
68
Figure 38: Four-core, shielded motor supply cable
a
Cu screen braid
b
PVC outer casing
c
Flexible wire (copper strands)
d
PVC core insulation, 3 x black, 1 x green–yellow
e
Textile and PVC fillers
If there are additional sub-assemblies in a motor feeder (such as motor con-
tactors, overload relays, motor chokes, sine filters or terminals), the shielding
of the motor cable can be interrupted close to these sub-assemblies and con-
nected to the mounting plate (PES) with a large area connection.
Free, i.e. non-shielded connection cables should not be any longer than about
300 mm (max. 500 mm).
3.5.2 Connection to control section
Push-in terminals are used to connect the control section.
b
a
e
d
c
ESD measures
Discharge yourself on a grounded surface before touching the
control signal terminals and the circuit board to prevent damage
through electrostatic discharge.
WARNING
Do not connect an external voltage source to control signal
terminal 1 (+24 V)!
￫
The relay contact (terminals with the contact) may have been
wired to a higher-level control circuit that has a dangerous
voltage (e.g. 110 V AC, 230 V AC) even when the variable
frequency drive is de-energized.
￫
When using more than one control voltage, we recommend
using separate cables.
Example
24 V DC at control signal terminals 1, 2, 3, 4, 6, and 8 and
110 V AC or 230 V AC at the relay contact.