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Zenith Automatic Transfer Switch | new.abb.com/low-voltage
Position Indication for Automatic Transfer Switch -
Standalone ATS and Isolation ATS
READY STATUS
INDICATOR
CONTACT POSITION
INDICATOR
DESCRIPTION
PERMISSIBLE OPERATION*
“CLOSED”
Contact set is closed, connecting load to source
User may manually open the contact set by
pushing the Open Button
“OPEN”
Opposite source contacts are closed or
mechanism spring is not charged
Contact set is open
If opposite source contacts are open the user
may manually charge the mechanism spring by
inserting Charging Handle into Manual Charge
access point and rotating clockwise
“READY”
“OPEN”
Mechanism is charged
Contact set is open
User may manually close the contact set by
pushing the Source Close Button
Table T4-1: Position Indication Description for Standalone ATS & Isolation ATS
*Permissible operations are given for illustrative purposes only. Never attempt to manually close contacts with opposite source contacts closed
CHARGE STATUS LED
CONTACT POSITION
INDICATOR
DESCRIPTION
PERMISSIBLE OPERATION*
On
“CLOSED”
Mechanism closing spring is charged
Contact set is closed, connecting load to source
User may manually open the contact set by
pushing the Bypass Open Button
On
“OPEN”
Mechanism closing spring is discharged
Contact set is open
User may manually close the contact set by
pushing the Bypass Source Close Button
“CLOSED”
Mechanism closing spring is not charged
Contact set is closed, connecting load to source
User may manually charge the mechanism
closing spring by inserting Charging Handle
into Bypass Manual Charge access point and
rotating clockwise
User may manually open the contact set
“OPEN”
Mechanism closing spring is not charged
Contact set is open
User may manually charge the mechanism
closing spring by inserting Charging Handle
into Bypass Manual Charge access point and
rotating clockwise
Table T4-2: Position Indication Description for Standalone ATS & Isolation ATS
*Permissible operations are given for illustrative purposes only. Never attempt to manually close contacts with opposite source contacts closed
OPERATIONS
NUMBER OF CRANKS REQUIRED
Main spring charge
Approx. 13
Table T4-3: Stored Energy Mechanism Sequences of Operation
Position Indication for Automatic Transfer Switch - Bypass ATS