Alpha Technologies INEX 100A STS Module and MBS+PDU - Manual (Page 26)

Argus Technologies Ltd. 019-061-C0 Rev A WC
Printed in Canada. © 2009 Argus Technologies Ltd. ARGUS is a registered trademark of Argus Technologies Ltd. All Rights Reserved. Page 16 of 26
6 Operation
The operation mode of STS is closely linked with the position of MBS.
MBS has two main connectors and three assistant connectors. The signal generated by three assistant
connectors are passed to DSP for position detection. Once an assistant connector is closed, the signal generated
is logic 0, in reverse, the signal will be logic 1, the combination of logic 0 and 1 forms eight kinds of status, there
are five kinds of valid status.
SW1/SW2/SW3 are the logic level signals detected by CPU, the five kinds of valid status are shown as follows:
6.1 MBS Position (0—Low, 1—High)
Contacts Signals
S
W
1
S
W
2
S
W
3
P1 0 1 1 Mains Bypass
Mains
Bypass
Inverter
Static SW
Normal Mains
Static SW
Inverter
Bypass
P2 0 0 1 Inverter
Maintenance
Mains
Bypass
Inverter
Static SW
Normal Mains
Static SW
Iverter
Bypass
P3 0 0 0 Normal Operation
Mains
Bypass
Inverter
Static SW
Normal Mains
Static SW
Inverter
Bypass
P4 1 0 0 Mains Maintenance
Mains
Bypass
Inverter
Static SW
Normal Mains
Static SW
Iverter
Bypass
P5 1 1 0 Inverter Bypass
Mains
Bypass
Inverter
Static SW
Normal Mains
Static SW
Inverter
Bypass
The STS Module will continuously detect the position of MBS in order to decide the transferring action between
different modes. At the time when STS is powered on, STS will judge whether the present position of MBS is
valid.
If the status is invalid, STS will consider MBS not well connected, and it won’t enter any operation mode, and the
red LED will blink at 5Hz. At the same time, “MBS abnormal” alarm will be sent to controller. This phenomenon
won’t disappear until the detection signal becomes normal.
If MBS is changed when STS runs at one of the five valid positions, and this change happens between two
adjacent positions, then STS will transfer to different mode based on current status; otherwise, STS won’t take
any action. For example, if MBS is at P3, STS will take action when MBS is turned to P2 or P4.