Emotron EMX-D, Instruction Manual

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16 Control Connections Emotron AB 01-5016-01r0
4.4.1 Cables
The standard control signal connections are suitable for
stranded flexible wire up to 1.5 mm
2
and for solid wire up to
2.5 mm
2
.
Fig. 12 Connecting the control signals and PTC
4.4.2 Types of control signals
Always make a distinction between the different types of sig-
nals. Because the different types of signals can adversely
affect each other, use a separate cable for each type. This is
often more practical because, for example, a control signal
may be connected directly to the variable speed drive.
We can distinguish between the following types of control
signals:
Analogue inputs
Voltage or current signals, (0-10 V, 4-20 mA) normally used
as control signals for speed.
Analogue outputs
Voltage or current signals, (0-10 V) which change slowly in
value or only occasionally. In general, these are measurement
signals.
Digital
Voltage or current signals (0-10 V, 0-24 V, 0/4-20 mA)
which can have only two values (high or low) and only occa-
sionally change in value.
Relay
Relay contacts (0-250 VAC) can switch highly inductive
loads (auxiliary relay, lamp, valve, brake, etc.).
4.4.3 Screening
For all signal cables the best results are obtained if the
screening is connected to both ends: the VSD side and at the
source.
It is strongly recommended that the signal cables be allowed
to cross mains and motor cables at a 90

angle. Do not let
the signal cable go in parallel with the mains and motor
cable.
NOTE: The screening of control signal cables is neces-
sary to comply with the immunity levels given in the EMC
Directive (it reduces the noise level).
NOTE: Control cables must be separated from motor and
mains cables.
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Control signal cables
Screen connection
of signal cables
Connection
of PTC
Signal
type
Maximum wire size
Tightening
torque
Cable type
Analogue Rigid cable:
0.14-2.5 mm
2
Flexible cable:
0.14-1.5 mm
2
0.5 Nm
Screened
Digital Screened
Relay Not screened