Installation Instructions

Chapter 5 - Control Unit
Battery Installation for Real Time Clock (RTC)
62 | 82
Siemens Industry, Inc.
Smart Infrastructure
Siemens BT300 HVAC Drive
Installation Instructions
DPD01148
2019-05-29
Option Board Type
Board Description
Insertable in
Slots
BT300-OPT-B9-V
I/O expansion board with one relay output and five 42 to 240 VAC digital inputs (1x RO, 5x DI
[42 to 240 Vac])
C, D, E
BT300-OPT-BF-V
I/O expansion board with one analog output, one digital output, and one relay output (1x AO, 1x
DO, 1x RO)
C, D, E
BT300-OPT-BH-V
I/O expansion board with three individual temperature measurement channels (NI100 Sensor
Card)
C, D, E
For more information about the installation and operation of the option boards, see
the Siemens BT300 Option Boards User Manual (DPD01158).
Battery Installation for Real Time Clock (RTC)
To enable the Real Time Clock (RTC) functions, a battery has been installed in the
Siemens BT300 HVAC Drive.
Use a 1/2 AA battery with voltage of 3.6V and capacity of 1000 to 1200 mAh (for
example, Panasonic BR-1/2 AA or Vitzrocell SB-AA02). The battery will last
approximately ten years.
The place for the battery can be found in all frames left to the control keypad (see
the figure in the Control Unit section on page [➙ 50]).
Detailed information on the functions of the Real Time Clock (RTC) can be found in
the Siemens BT300 HVAC Drive Operator's Manual (DPD01809).
Galvanic Isolation Barriers
The control connections are isolated from line voltage potential and the GND
terminals are permanently connected to ground. See the following figure.
The digital inputs are galvanically isolated from the I/O ground. The relay outputs
are additionally double-isolated from each other at 300 Vac (EN-50178).