GEA Grasso - Page 103

Grasso
Refri
g
eration Division
GRASSO SYSTEM CONTROL
01.2003/0 638660E_chapter5.doc Kap.5 - 5
Figure 5.2: Interfaces C7-633, power supply and Author. connection
The individual users can also be fitted with a bus cable connector.
This connector is inserted directly in the bus interface (9-pin sub-D jack).
The incoming and outgoing bus cable is connected in the socket via 4 terminals. The line termination resistance
integrated in the bus cable can be connected via a switch. This is required at both ends of a network.
We recommend bus cable connectors with vertical outgoing feeder cables.
Figure 5.3: Bus cable connectors and PG junction box
A two core, double shielded bus cable is used as a connection cable between the individual bus users.
The MPI communication can be used by the customer for reading the following values out of the reciprocating
compressor package:
- All analogue values (pressures, temperatures, motor current etc.)
- Remaining waiting times
- Active warning and alarm messages
- Status messages
Furthermore, by sending control commands over the MPI communication remote control of the reciprocating
compressor package is possible.
Programming
interface for OP
Power supply and
authorisation input
line termination
resistance