install the following earth-leakage detection device: BENDER RCMA 470LY with external
current transformer.
• Network type TT:
In case of TT-systems, safety regulations mostly impose the use of an earth-leakage circuit
breaker (e.l.c.b). In combination with frequency converters, type B residual current operated
protective devices should be used. It is advised to install the following earth-leakage
detection device: BENDER RCMA 470LY with external current transformer.
Note
It is strongly recommended not to connect the neutral conductor from the power supply
to the compressor unit. The exposed conductive parts of the installation have to be
earthed locally (EN 60204-1 par.: 7.2.3).
1. Provide an isolating switch in the voltage supply line. Before starting any maintenance,
adjustments or repair, this switch must be opened to switch off the voltage to the
compressor.
2. Check that the motor cables and wires inside the electric cabinet are clamped tight to their
terminals.
3. Check the fuses and the setting of the circuit breakers. See section Settings of overload
relay and fuses
4. Connect the power supply to the terminals of contactor (K21). Connect the earth conductor
to connector (PE). Consult section Electric cable size.
Electrical diagram
The electrical diagram is supplied with the compressor and is shipped inside the electric cubicle.
The tables below list the typical components and their abbreviations as used in the diagrams:
Reference Compressor
B1 Electronic water drain, intercooler
B2 Electronic water drain, aftercooler
M1 Compressor motor
M2 Fan motor (air-cooled units only)
M3 Cubicle fan (HAT versions only)
PDT02 Pressure transducer, Δp air filter
PT 18 Pressure transducer, intercooler
PT 29 Pressure transducer, delivery air
PT45 Pressure transducer, oil
TT11 Temperature sensor element, LP outlet
TT18 Temperature sensor, HP inlet
TT21 Temperature sensor element, HP outlet
TT29 Temperature sensor, delivery air
TT45 Temperature sensor, oil
TT11 Temperature sensor element, LP outlet
TT51 Temperature sensor, cooling water inlet (water-cooled compressors)
TT58 Temperature sensor, cooling water intercooler out (water-cooled compressors)
TT59 Temperature sensor, cooling water aftercooler out (water-cooled compressors)
Instruction book
API797429 49
To Next Page
Loading...
