Figure 11 Controller status information
1. Standby speed increase button
2. RS485 / RS232 switch
3. Controller connector socket
4. Standby speed reduce button
5. Alarm LED
6. Status LED
7. Normal LED
1. Standby speed increase button
2. RS485 / RS232 switch
3. Controller connector socket
4. Standby speed reduce button
5. Alarm LED
6. Status LED
7. Normal LED
CAUTION: PUMP GROUND CONNECTION
Risk of damage to equipment. When you connect the pump to a PC, the 0 V pin on
the RS232 connector can be connected to the ground through the PC. Make sure that
the 0 V rail of the 24
‑
48 V d.c. supply is not connected to the ground at other point
(example, at the power supply). If the 0 V rail of the 24
‑
48 V d.c. supply will not be
connected to the ground at the PC, use an opto-isolated interface to the PC.
The pump can connect to the RS485 or RS232 serial input on the control equipment or a
PC as shown in
Figure: Logic interface connections - RS232 serial control on page 43
Figure: Logic interface connections - RS485 serial control on page 43
. In given
configuration, the PC is the serial link master and the pump is the slave. The distance
over which the serial link will work is dependent on the difference in voltage between
the 0 V at the sending and receiving end. If the 0 V reference at the receiving end is in
0.3 V of the 0 V control reference pin on the pump control connector, then the serial link
has to be capable of to operate at a distance up to 6 m. For longer distance, an interface
circuit external to the pump can be necessary.
The software in the pump can operate with the other pumps connected to a single serial
link master. This is a multi-drop mode. The RS485 option is recommended for the multi-
drop mode. When the RS232 option is selected, more hardware is necessary to link
number of pump units to a single serial link master. A concept drawing of one possible
arrangement is shown in
Figure: Conceptual diagram for multi-drop connection using
. When the RS485 option is selected, it is easy to connect
Page 42
B85200880_D - Installation
