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Instruction Booklet
Page 6 Effective: April 2004
ATC-300 Automatic
Transfer Switch
Controller
35. Pre-Transfer Signal
This feature provides a signal to a remote device prior
to a re-transfer operation. It provides one Form “C”
contact (NO/NC) for interface with other equipment
(typically elevator controls). The contacts close/open
on a timed basis prior to transfer in either direction.
After TDNE/TDEN times out, this relay closes and the
Pre-transfer Timer (TPRE) starts timing. After the
TPRE times out, the transfer proceeds by starting the
TDN timer if enabled. The pre-transfer relay opens
after the transfer is complete.
Adjustable 0 - 120 Seconds
35A. Pre-transfer Signal with 1 N.O. and 1 N.C. Contacts
This feature provides pre-transfer signal and includes
1 N.O. and 1 N.C. contact.
1.5.2.2 Optional Features
The following is a list of the optional features of the ATC-300
Controller.
5. Source 2 Monitoring and Protection
This feature provides monitoring and protection based
on the Source 2 voltage and/or frequency setpoints. All
Feature 5 functions are “failsafe” operations.
5C. 1-Phase Overvoltage/Overfrequency
Adjustable Overvoltage:
Dropout: 105 - 120% of nominal
Pickup: (Dropout –2%) - 103% of nominal
Adjustable Overfrequency:
Dropout: 103 - 110% of nominal
Pickup: (Dropout -1Hz) - 101% of nominal
5D. 1-Phase Undervoltage
Adjustable Undervoltage:
Dropout: 50 - 97% of nominal
Pickup: (Dropout +2%) - 99% of nominal
5E. 1-Phase Overvoltage
Adjustable Overvoltage:
Dropout: 105 - 120% of nominal
Pickup: (Dropout –2%) - 103% of nominal
5F. 3-Phase Undervoltage
Adjustable Undervoltage:
Dropout: 50 - 97% of nominal
Pickup: (Dropout +2%) - 99% of nominal
5G. 3-Phase Overvoltage
Adjustable Overvoltage:
Dropout: 105 - 120% of nominal
Pickup: (Dropout –2%) - 103% of nominal
5H. Phase Reversal
For a 3-phase source, this feature monitors the phase
sequence of the sources. If both sources do not have
the same ABC or CBA sequence, the source that is not
connected will be considered “Unavailable”.
5K. 3-Phase Overvoltage/Overfrequency
Adjustable Overvoltage:
Dropout: 105 - 120% of nominal
Pickup: (Dropout –2%) - 103% of nominal
Adjustable Overfrequency:
Dropout: 103 - 110% of nominal
Pickup: (Dropout -1Hz) - 101% of nominal
5L. Source 2 3-Phase Source 2 Voltage Unbalance/Loss
For a 3-phase source, this feature monitors phase volt-
age ratios. Voltage unbalance (%) is calculated as the
difference between the maximum and minimum phase
voltage, divided by the minimum phase voltage. User-
selectable setpoints are available for dropout and pickup
unbalance settings (minimum 2% differential). Dropout
is adjustable from 5 to 20%. Pickup is adjustable from 3
to (Dropout –2%). A setpoint for user-selectable time
delay from 10 to 30 seconds is provided. The factory
default setpoints are: 5% dropout, 3% pickup, and 30
seconds time delay. A user-selectable setpoint for
enable and disable is also provided.
When an unbalance condition is detected on Source 2,
the Unbalance Timer (TD UNBAL) starts timing. After
TD UNBAL times out, Source 2 is declared “failed”.
12. Power Source Annunciation
This feature provides LEDs to give switch position and
power source availability indications.
Overcurrent Trip Indication
Available only with integral Overcurrent Protection
(Feature 16). (Shown on Automatic Transfer Controller
Display.)
12L. Source 1 Tripped (Requires Feature 16) Via ATC-300
LDC-Based Display
The Automatic Transfer Controller LCD display will
read “Lockout” if the Source 1 circuit breaker is in the
“tripped” position.
12M. Source 2 Tripped (Requires Feature 16) Via ATC-300
LDC-Based Display
The Automatic Transfer Controller LCD display will
read “Lockout” if the Source 2 circuit breaker is in the
“tripped” position.
This feature provides Form “C” relay auxiliary contacts.
14. Relay Auxiliary Contacts
This feature provides Form “C” relay auxiliary contacts.
14G. Source 1 Present 1NO/1NC
This feature provides two NO and two NC contacts.
The relay is energized only when the Source 1 power
source is available.
14H. Source 2 Present 1NO/1NC
This feature provides two NO and two NC contacts.
The relay is energized only when the Source 2 power
source is available.
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