Nx Networks NX series - Manual (Page 81)

Commissioning 81(86)
8
8. COMMISSIONING
8.1 Safety
Before commissioning, note the following directions and warnings:
1 Internal components and circuit boards of the frequency converter
(except for the galvanically isolated I/O terminals) are live when the NX is
connected to mains potential. Coming into contact with this voltage is
extremely dangerous and may cause death or severe injury.
2 The motor terminals U, V, W and the DC-link/brake resistor terminals –/+
are live when the NX is connected to mains, even if the motor is not
running.
3 The control I/O-terminals are isolated from the mains potential. However,
the relay outputs and other I/O-terminals may have a dangerous control
voltage present even when the NX is disconnected from mains.
4 Do not make any connections with the frequency converter connected to
the mains.
5 After having disconnected the frequency converter from the mains, wait
until the fan stops and the indicators on the keypad go out (if no keypad
is attached see the indicator through the keypad base). Wait 5 more
minutes before doing any work on the NX connections. Do not even open
the cover before this time has expired.
6 Before connecting the frequency converter to mains make sure that the
NX front cover is closed.
8.2 Commissioning of the frequency converter
1 Read the safety instructions in Chapter 1 and above and follow them.
2 After the installation, pay attention to:
- that both the frequency converter and the motor are grounded.
- that the mains and motor cables comply with the requirements given in Chapter 6.1.1.
- that the control cables are located as far as possible from the power cables (see
Chapter 6.1.2, step 3), the shields of the shielded cables are connected to protective
earth . The wires may not touch the electrical components of the frequency
converter.
- that the common inputs of digital input groups are connected to +24V or ground of the
I/O terminal or the external supply.
3 Check the quality and quantity of cooling air (Chapter 5.2, and Table 5-7).
4 Check the inside of the frequency converter for condensation.
5 Check that all Start/Stop switches connected to the I/O terminals are in Stop-position.
6 Connect the frequency converter to mains.
WARNING