Asco 7000 Series - Maintenance Handle

Chapter 2 Installation And Operation 7
ASCO 7000 Series Medium Voltage Transfer Switch User Manual
4. Energizing procedure
 On Control Section, turn the Transfer Switch Auto-Man selector switch to the AUTO (automatic) position.
 On CB Section, turn the Normal source circuit breaker control switch to CLOSE position (red target
window).
 On CB Section, turn the Emergency source circuit breaker control switch to the CLOSE position (red
target).
 On Control Section, press the transfer controls Alarm Reset button. Normal source circuit breaker should
close.
The Normal source CB control switch should indicate that the circuit breaker is CLOSED (red light).
The ATS is now in an automatic (standby) operating mode. Proceed to transfer test.
2.2.3 Controller Settings for MV ATSs
Refer to the manual from the manufacturer of the metal-clad switchgear for section handling, installation, power
connections, and testing.
The Group 5 Controller is factory set for medium voltage operation. These are the special settings:
1. Controller Voltage Jumper Blocks
The control voltage is typically stepped down to 120V, so the eight jumper blocks are factory arranged
horizontally for 120 V input.
2. Controller Menu Settings
ATS Information Rating is 1200, 2000, or 3000 A. The ATS information rating setting is 1200A, 2000A, or 3000A.
ATS Information is Circuit Breaker Non Bypass. The ATS information type setting is BRKR NBPS.
3. Lock-Out Relay (optional)
If an optional protective relay (device) is ordered for the normal and/or emergency source circuit breaker, a
Lock-Out Relay (LOR) is provided on the appropriate circuit breaker compartment door. The LOR responds to a
signal from a protective relay and in turn trips the appropriate circuit breaker. The LOR locks out the circuit
breaker until the fault is cleared and the protective relay and LOR has been reset. A red light and orange window
shows tripped.
Figure 2-4 Lock-Out Relay
What to do if a circuit breaker trips
1. Check the protective relay and determine the cause of the trip. Refer to device’s instructions. After fault is cleared,
reset the protective relay.
2. Reset the Lock-Out Relay by turning it to RESET.
3. Turn the Breaker Control switch to CLOSE.
4. Press the Alarm Reset button. The circuit breaker should close if its connected source is selected by the controller
to serve the load.
Status window
black=ready to respond
orange=trip signal sent to CB
Lock-Out Relay status lights
green=ready to respond
red=trip signal sent to CB