Siemens SENTRON Manual page 117

Functions of the inputs for the power supply and voltage measurement of the motor operator
Inputs 101-102 and 201-202
Inputs 101-102 and 201-202 are used for supplying power to the electronic module and the
transfer switching equipment. This must be between the following ranges:
● 208 – 277 V AC ± 20 % (166 – 332 V AC)
● 45 – 65 Hz
Current input:
● 100 mA (standby mode)
● 15 A max. (transfer mode)
Overvoltage protection:
● 4.8 kV - 1.2 / 50 µs
Inputs 103-106 and 203-206
Inputs 103-106 and 203-206 are used for voltage and frequency measurements. The voltage
and frequency measurements are implemented using additional accessories. For more
information, see the section titled Connecting the inputs and outputs of the electronic module
(3KC8 only) (Page 89).
Using these accessories, the electronic module can monitor both sources. The
corresponding default must be selected on the DIP switches for this purpose. For more
information, see the section titled Automatic mode - programming of the electronic module
(3KC8 only) (Page 132). The results of the voltage measurement have a direct effect on the
display of source availability and on automatic mode of the transfer switching equipment.
The following parameters can be monitored:
● Phase rotation: To determine the phase rotation, both sources I and II must be available.
● Frequency within defined limits: Compliance with the frequency limits refers either to the
nominal frequency (default "Auto Conf" on potentiometer 1) or the default via
potentiometer 1 in conjunction with the limits of potentiometer 2.
● Loss of the neutral conductor: In three-phase 4-wire networks with neutral (default of DIP
switch 1 at position A and DIP switch 2 at position C), the loss of the neutral conductor is
detected for most loads. The loss is only established under load.
● Loss of the main or alternative source supply: Loss of the main or alternative source
depends on the rated voltage and the frequency in conjunction with the limits set by
potentiometer 2. The source supply is regarded as not available when the timer for the
delay on loss of the supply has expired (potentiometer 3).
● Return of the main or alternative source supply: The return of the main or alternative
source depends on the line voltage and the frequency in conjunction with the limits set by
potentiometer 2. The source supply is regarded as available when the timer for the delay
on return of the supply has expired (potentiometer 4).
Manual, 08/2017, L1V30368969104A-02
7.2 Functions of the inputs and outputs
Operation
117