Asco 7000 Series - Trouble-Shooting

6 Chapter 2 Installation And Operation
ASCO 7000 Series Medium Voltage Transfer Switch User Manual
2.1.6 Auxiliary Circuits
Connect auxiliary circuit wires to appropriate terminals on terminal block TB as shown on the wiring diagram provided
with the automatic transfer switch.
2.2 Operation
2.2.1 Configuration of Shipped ATS
The MV ATS is shipped with the circuit breakers and controls in the following state:
 SOURCE 1 SECTION, check these items
 Normal source circuit breaker (CBN)
In the OPEN position with the closing spring discharged.
 Normal source circuit breaker control switch (53CBN)
In the NAT (normal after trip) position (green target displayed on control switch if the power of control circuit
energized)
 SOURCE 2 SECTION, check these items
 Emergency source circuit breaker (CBE)
In the OPEN position with the closing spring discharged.
 Emergency source circuit breaker control
switch (53CBE)
In the NAT (normal after trip) position
(green target displayed on control switch
if the power of control circuit energized)
 LOAD SECTION, check this item
 Transfer Switch Auto-Man selector switch
(53AM) in the MAN (manual) position.
Figure 2-2 Location of control switches
Figure 2-3 Control switches
2.2.2 Energizing the Normal Source, Setting Automatic Operation Mode
After the MV ATS is installed, the Normal source can be energized. Then the controls can be set for automatic
(standby) operation. The Normal and Emergency sources must be available. Follow this procedure:
1. LOAD SECTION – Controls, check these items
 The transfer control indicator lights Normal Source Accepted and TS Locked Out should be on.
 The controller display should show that the transfer switch is Locked Out.
2. SOURCE 1 SECTION - Circuit Breakers, check these items
 Normal source circuit breaker control switch should indicate that the circuit breaker is OPEN (green light).
3. SOURCE 2 SECTION - Circuit Breakers, check these items
 Emergency source circuit breaker control switch should indicate that the circuit breaker is OPEN (green
light).
Green
Red
Breaker control
target indicator
Green=tripped
Red=closed
Emergency source
circuit breaker
control switch
Normal source
circuit breaker
control switch
Transfer Switch
Auto-Man selector
switch