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the option panel door can be opened. (Bypass
panel only.)
•
Disconnect without fuses. For user-supplied fuses
option. (Bypass panel only.)
•
Main circuit breaker. A thermal/ magnetic current
interrupt device using an ON/TRIP/OFF/RESET
switch. When in the ON position, a trip fault
removes power from the drive/bypass circuit and
the switch moves to the TRIP setting. The switch
must be moved to the RESET position
momentarily after the fault has been cleared to
reset the circuit breaker. (Bypass panel only.)
•
Main Disconnect with drive fuses. Non-bypass
panel two-position (ON/OFF) rotary switch that
disconnects the main AC line power to the drive
only.
1.6.2 Mode Selector Switch
The mode selector switch is used for 3-contactor bypass
on EMB2 units. The selector switch allows the operator to
select from four modes of operation.
Drive mode: When drive mode is selected, the M1 and M2
contactors are closed allowing power to flow in and out of
the drive to the motor.
Off mode: This mode opens all contactors removing any
power to the motor.
Bypass mode:When bypass mode is selected, the M3
contactor closes and allows the motor to run directly from
the input line power.
Test mode:Test mode closes the M1 and M3 contactors
and allows the motor to be powered by the input line
power. This also allows the drive to power up without
being connected to the motor. Refer to Figure 1.2.
Introduction
1-4 BAS-SVX49A-EN