GB - 18
Connection of the Power Unit
3.2.2.3 Cable-fed disturbances depending on the motor line length at AC supply
The maximum motor line length is depending on the capacity of the motor cable as well as
on the EMC emitted interference. The following data apply for operation under nominal rating
conditions.
Size
Max. motor line length shielded
max. leakage
current
(at fN≤100 Hz)
in accordance with EN 61800-3
Category C1 Category C2
Motor cable
(standard)
Motor cable
(low capaci-
tance)
Motor cable
(standard)
Motor cable
(low capaci-
tance)
13
25 m 50 m 50 m 100 m < 5 mA14
15
The line length can be extend signicant by using motor chokes or lters. KEB recom-
mends the use of motor chokes or lters for a line length upto 50 m. Motor chokes or
lters are absolutely necessary upto 100 m.
3.2.2.4 Motor cable cross-section
The conductor cross-section of the motor cable is dependent on the output current, the cable
according to manufacturer's data, as well as the VDE regulations.
3.2.2.5 Interconnection of the motor
The connecting-up instructions of the motor manufacturer are generally valid !
Protect motor
against voltage
peaks !
Inverters switch at the output with du/dt ≤ 5kV/µs. Voltage peaks
that endanger the insulation system at the motor can occur espe-
cially in case of long motor cables (> 15 m).
A motor choke, a dv/dt-lter or sine-wave lter can be used for
protection of the motor.
3.2.2.6 Terminal strip X1B motor connection
X1B Name Function Cross-section Tightening
torque
U, V, W Motor connection
0.2-16 mm²
AWG 26-6
2.3 Nm
20.5 lb-inch
PE,
Connection for pro-
tective earth
Screw M4 for
ring thimble
1.3 Nm
11 lb inch
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