Installation Instructions

Chapter 5 - Control Unit
Installation in Corner-Grounded Network
50 | 82
Siemens Industry, Inc.
Smart Infrastructure
Siemens BT300 HVAC Drive
Installation Instructions
DPD01148
2019-05-29
Chapter 5 - Control Unit
The control unit of the AC drive consists of the control board and additional boards
(option boards) connected to the slot connectors of the control board.
Figure 37: Location of Control Unit Components.
A
Control terminals for the standard I/O connections
B
Ethernet connection
C
Relay board terminals for 3 relay outputs or 2 relay outputs and a thermistor
D
Optional boards
E
DIP switch for RS485 bus termination
F
DIP switch for signal selection of Analog Output
G
DIP switch for isolation of the digital inputs from ground
H
DIP switch for signal selection of Analog Input 2
I
DIP switch for selection of Analog Input 1
J
Status indicator of the Ethernet connection.
K
Fan (only in IP54 of MR4 and MR5)
L
RTC battery
M
Default position of the Safe Torque Off (STO) jumper
When delivered from the factory, the control unit of the drive contains the standard
controlling interface—the control terminals of the control board and the relay
board—unless otherwise specifically ordered. On the next pages you will find the
arrangement of the control I/O and the relay terminals, the general wiring diagram
and the control signal descriptions.
The control board can be powered externally (+24 Vdc, 100 mA, ±10%) by
connecting the external power source to terminal #30; see the figure in the Control
Terminals and DIP Switches section on page [➙ 51]. This voltage is sufficient for
parameter setting and for keeping the control unit active. Note however, that the