Siemens G85139 - Manual (Page 8)

English 2. INSTALLATION
G85139-H1750-U049-B © Siemens plc 1997
26/09/97 8
2.3 Electrical Installation
The electrical connectors on the MICROMASTER are shown in Figure 3. Connect the cables to the power
and control terminal blocks in accordance with the information supplied in sections 2.3.1 - 2.3.4. Ensure that
the leads are connected correctly and the equipment is properly earthed as shown in Figure 3.
CAUTION
The control, power supply and motor leads must be laid separately. They must not be fed
through the same cable conduit/trunking.
Use screened cable for the control lead. Use Class 1 60/75 o C copper wire only (for UL compliance).
Tightening torque for the power (mains input and motor) terminals is 1.1 Nm.
To tighten up the power/motor terminal screws use a 4 - 5 mm cross-tip screwdriver.
2.3.1 Power and Motor Connections - Frame Size A
Ensure that the power source supplies the correct voltage and is designed for the necessary current (see
section 7). Ensure that the appropriate circuit-breakers/fuses with the specified current rating are connected
between the power supply and inverter
(see section 7).
Connect the power and motor connections as shown in Figure 3.
WARNING
Isolate the supply before making or changing connections.
Ensure that the motor is configured for the correct supply voltage. Single/three phase 230 V
MICROMASTERS must not be connected to a 400 V three phase supply.
When synchronous machines are connected or when coupling several motors in parallel, the
inverter must be operated with voltage/frequency control characteristic (P077= 0 or 2).