NORDAC PRO (SK 500P) – Users Manual for Frequency Inverters
40 BU 0600 en-2319
2.5.3.1 Electromechanical brake
Power supply for an electro-mechanical brake
Connection of an electro-mechanical brake to the motor terminals may cause destruction of the brake
or the frequency inverter.
• Only provide the power supply for an electro-mechanical brake (or its brake rectifier) via the mains
or mains voltage.
An electro-mechanical brake (holding brake) can be connected via one of the two multi-function relays
(K1 / K2) to control terminal X5. In particular, take special note of parameters P107, P114 and P434.
2.5.3.2 Mains connection (PE, L1, L2/N, L3)
No special safety measures are required on the mains input side of the frequency inverter. It is
advisable to use the normal mains fuses (see technical data) and a main switch or circuit breaker.
Frequency inverter data Permissible mains data
Voltage Power 1 ~ 230 V 3 ~ 400 V
230 V AC 0.25 + 2.2 kW X
Connections
L/N = L1/L2 L1/L2/L3
Isolation from or connection to the mains must always be carried out for all the poles and
synchronously (L1/L2/L2 or. L1/N).
Adaptation to IT networks
Unexpected movement in case of mains faults
In case of a mains fault (short circuit to earth) a frequency inverter which is switched off may switch
on automatically. Depending on the parameterisation, this may cause the drive unit to start
automatically and therefore cause a risk of injury.
•
Secure the system against unexpected movement (block, decouple mechanical drive, provide
protection against falling, etc.)
Operation in IT networks
If a mains fault (short-circuit to earth) occurs in an IT network, the link circuit of a connected frequency
inverter may become charged, even if it is switched off. This results in destruction of the link circuit
capacitors due to overcharging.
• Connect a braking resistor to dissipate excess energy.
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