GE Industrial Solutions MX350 Instruction manual - Manual (Page 82)

5–8 MX350 AUTOMATIC TRANSFER CONTROL SYSTEM – INSTRUCTION MANUAL
CONFIGURATION SETPOINTS CHAPTER 5: SETPOINTS
Common ATS setpoints
Several setpoints are dependent on the chosen ATS type. The setpoints shown below are
common for all ATS types. They are accessible as Modbus registers as well as through the
Setpnt/Config/ATS screen.
ATS name
Range: Up to 20 alphanumeric characters
Default: ATS
This setpoint specifies a name for the ATS. This name will appear with the actual values,
sequence of events record, and other reports
Load control type (for up to 6 loads - LC1 through LC6)
Range: Not Set/Elevator Pre-Signal (T3/W3)/Load Disconnect
Default: Not Set
Load control signals are used to protect certain loads during a transfer of the switch
from one active source to the other. The following picture shows the screen that is used
to activate load control outputs
.
Elevator Pre-Signal (T3/W3) contacts open prior to transfer in either direction. The user can
specify the time period during which the signal is activated. It can range from 0 seconds to
60 minutes on the Setpoints\Operation\Timers screen. Load Control outputs selected as
‘Pre Elevator Signal’ will only be activated when both sources are available.
Load Control outputs selected as type Load Disconnect will close a contact prior to the
load transfer. The operator can specify the time period during which the signal is activated
by entering the desired value as ‘Pre Load Control x (LCx) Timer’. Unlike the Elevator Pre-
Signal, Load Disconnect signals will stay active after the load transfer has occurred for the
time specified as ‘Post Load Control x (LCx) Timer’. Timer presets are selected for each
load on the Setpoints\Operation\Timers screen and can range from 0 sec to 60 minutes.
When one or more Load Control outputs have been activated, the following will happen
during a transfer sequence with both sources available (e.g. load test):
•
Immediately after the W or T timer expires, the Load Control output is energized.
• If several Load Control outputs have been selected by the user, the Load Control with
the longest ‘Pre Load Control x (LCx) Time’ is activated, followed by the one with the
second longest Pre Load Control Time, etc.
• All load control pre-timers expire at the same time. When that happens, the controller
transfers the ATS from S1 to S2 or S2 to S1.
• The Load control outputs selected as ‘Pre Elevator Signal’ are de-energized
immediately after the transfer.
• Load Control outputs for each Load Control output selected as ‘Load Disconnect’
remain energized for the time specified as ‘Post Load Control Time’ for the respective
load.