5 Installation at Site
20 of 44
UPAchrom
If no earth conductor is provided, the operator shall be responsible for earthing
the motor externally. (Core cross-section corresponding to phase conductor, min.
4 mm
2
)
5.
Connect the shield of shielded extension cables to the earth conductor. 3-core
motor leads as described in paragraph 4 must be earthed externally; connect the
shield of the extension cable to the earth conductor.
6.
Transfer the core identification of the motor lead to the cores of the extension
cable. Make sure the colour codes match when connecting the cores.
The core codes depend on the wiring type of the motor:
Table 5:
Core codes
Motors for DOL starting with 1 cable
U
V
W
Motors for star/delta starting with 2 cables
U 1
V 1
W 1
U 2
V 2
W 2
Motors for DOL starting with 2 parallel cables
U1 - 1
V1 - 1
W1 - 1
U1 - 2
V1 - 2
W1 - 2
5.1.4 Measuring the insulation resistance
DANGER
Hazardous voltage during and after measurement
Danger of death from electric shock!
▷
Do not touch the contact points during and immediately after measurement.
▷
Insulation resistance measurement must be effected by a trained electrician
only.
Measure the insulation resistance prior to installation and prior to connection to the
power supply.
Insulation resistance measurement must be effected by a trained electrician only.
Prior to the measurement, ensure compliance with the operating instructions of the
insulation resistance measuring device.
ü
An insulation resistance measuring device with a measuring voltage of 1000 V DC
is available.
ü
The contact points are clean and dry.
1.
Measurement period: 1 minute
4)
2.
Recommendation: insulation value at 20 °C - 30 °C: > 200 MOhm
5)
4)
The measured value must be steady; a longer measurement period might be needed for larger cable cross-sections.
5)
The insulation resistance depends on the cable type and length.
