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IB140012EN
Instructional Booklet
Page
44
Effective: March 2021
Operation and Maintenance Manual,
Automatic Transfer Switch Controller, ATC-900
*3.5. Function Code 05 – Write Single Coil
(Programmable Outputs and Operation Commands)
Function code 05 executes a Write Coil Command to control the
programmable output relays of the ATC-900 by sending the Coil
Value (FF00 for coil ON, 0000 for coil OFF) to the appropriate reg-
ister address.
Note:
The programmable output must be mapped to “Remote I/O” (via
Group 5 setpoints), otherwise the command is ignored and the ATC900
responds with an exception code (01 – ILLEGAL FUNCTION).
Note:
S2 Permit (Input), S2 Request (Output), and TDIRF (Timer) are used
on a private switch, please see switch instruction booklet for information
on operation of each.
35C
O
Pre/Post Transfer Signal
Provides a signal prior to the transferring of the load. Will not transfer until the programmable delay set point in the controller is reached. If
both sources are not available, this option will ignore the time delay set in the controller. The time delay is programmable for 0-120 second pre
transfer and 0-120 seconds post transfer.
45A-L
O
Load Sequencing Contacts
Provides the capability for sequential contact closure of up to 10 contacts after a transfer. A single adjustable time delay between each of
the relay closures is provided. Operates using the configurable output contacts (form-c). Adjustable 0-120 seconds.
45L
O
Selective Load Shed
Provides an output contact that opens to shed a customer load if the measured kW value exceeds the Load Shed kW setpoint value. The load
will be picked up if the Load Restore setpoint is attained. The DCT module is required for current measurements. User to set kV and time
values.
81A
O
General Alarm Indication
contact
Provides remote indication that an alarm condition exists on the ATC-900. Remains on until all alarms are resolved and reset at the controller.
81B
O
Monitor Mode
Provides remote indication that the ATS is not in automatic mode. When Monitor Mode is released, the ATS will be in normal or automatic
operation.
81C
O
ATS in Test
Provides remote indication that the ATS is currently running a test. The test could be initiated by the device panel engine test pushbutton or
automatically using the programmed engine excersier.
81D
O
Engine Test Aborted
Provides remote indication that an engine test has been aborted. If during engine test, if either S1 or S2 is removed, the output will be enabled.
The ATC-900 event log contains detailed event information that can help assess the reason the test was aborted
81E
O
Cooldown in Process
Provides remote indication that an engine cooldown is in progess
81F
O
Gen Start Status (1 & 2)
Provides remote indication that the engine start contact is calling for the generator to start. There is a separate Output for each S1 and S2.
81G
O
LOAD SHED - S2 Inhibit On
Provides remote indication that the emergency inhibit is on .
81GL
O
LOAD SHED - S2 Inhibit On
w/white indicating light
Provides a 30mm pilot light on the transfer switch device panel to indicate that S2 Inhibit is on.
81H
O
ATS on Bypass
Provides remote indication that the bypass switch is carryling the load.
81M
O
Load Bank Control
The load bank control output is turned on when an unloaded engine test is in process and the load is connected to the source that is not under
test. It is off at all other times. If, while an engine test is in process, the non-test source fails (i.e. Source 1), the test is aborted which will
cause load bank control relay to turn off in anticipation of transferring load to the generator.
81N
0
Health
Provides a remote indication that an alarm condition or loss of control power exists on the ATC-900. Remains on until an alarm condition
occurs or control power is lost.
90A
O
Primary Control
The ATC-900 Primary/Secondary controller functionality provides the user with the ability to use two independent transfer switches in three
source systems consisting of a utility and two generator sources. In a three-source system, the Primary ATS controls the engine starting and
stopping of the Secondary ATS. The Secondary input receives the engine start signal from the Primary controller.
--
O
Remote I/O
Uses Modbus control to set an Output relay. See the ATC-900 Modbus Communications Guide IB140006EN for more information.*
--
I
Remote I/O
Enables logging of input change events for customer-specific applications.
TYPE
I/O
I/O DEFINITIONS
SUMMARY
