5
Electrical installation
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Operating Instructions – EDR..71 – 315, EDRN63 – 315
90
Encoder connection
When connecting the encoders to the inverters, observe the provided wiring diagrams
and the information in these operating instructions as well as the operating instruc-
tions/wiring diagrams of the respective inverter and the operating instructions/wiring
diagrams provided with the third-party encoder, if applicable. For the wiring diagram,
see the "Appendix" (→
221).
•
Maximum line length (inverter to encoder):
– 100 m with a capacitance per unit length core – shield ≤ 110 nF/km
– 100 m with a capacitance per unit length core – core ≤ 85 nF/km
•
Core cross-section: 0.20 – 0.5 mm
2
, recommendation ≥ 0.25 mm
2
•
Use shielded cable with twisted pair cores and apply shield over large area on
both ends:
– In the cable gland of the encoder connection cover or in the encoder connector
– To the inverter on the electronics shield clamp or to the housing of the D‑sub
connector
•
Install the encoder cables separately from the power cables, maintaining a dis-
tance of at least 200 mm.
•
Compare the operating voltage with the permitted operating voltage range on the
encoder nameplate. Deviations in the operating voltage may overheat and damage
the encoder.
•
Observe the clamping area of 5 to 10 mm of the cable gland of the connection
cover. If you use cables with a different cross section, you have to replace the
provided cable gland with another suitable cable gland.
•
The cable glands for the cable entry must meet the following conditions:
– Cramping area is suitable for the used cable(s)
– The IP degree of protection of the encoder connection is at least as high as the
IP degree of protection of the actual encoder
– Use is permitted according to the assignment to category/zone
– The operating temperature range matches the designated ambient temperature
range.
•
Check the flawless state and the proper seat of the connection cover gasket.
•
Tighten the screws of the connection cover with a tightening torque of 2 Nm.
5.17.7
Anti-condensation heating
If explosion-proof motors are operated at ambient temperatures below -20 °C, the use
of an anti-condensation heating is required.
Anti-condensation heating can optionally be used for applications operated at ambient
temperatures above -20 °C where moisture condensation is expected.
The strip heaters are controlled according to the following principle:
•
Motor switched off → anti-condensation heating activated
•
Motor switched on → anti-condensation heating deactivated
Observe the permitted voltage according to the nameplate and the enclosed terminal
assignment diagram.
25896334/EN – 06/2019