ABB ACS 502 Series, Инструкция по установке и запуску

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Chapter 2 – Overview of the ACS 502/504
2-18 ACS 502 Installation & Start-up Manual
Bypass Options
The Bypass Options are:
• Manual Bypass,
• Manual Bypass with Service Switch,
• Automatic Bypass, and
• Automatic Bypass with Service Switch.
Manual Bypass
The Manual Bypass option is a selector switch which transfers the motor to
line power and allows the motor to operate at full speed.
Note: If motor overload is not provided, one must be installed external to the
drive and sized in accordance with NEC.
The Manual Bypass option has two contactors, electrically interlocked and
controlled by a three position, door-mounted switch. Switch positions are
NORMAL, TEST, and BYPASS. In the NORMAL position, the Bypass
contactor is open, the Output contactor is closed, and the Normal indicator
light is illuminated. In the TEST position, both contactors are open. In the
BYPASS position, the Output contactor is open, the Bypass contactor is
closed, the drive is disabled, and the Bypass indicator light is illuminated. A
circuit breaker protects the motor in the Bypass mode.
An External Fault indicator light is included. The External Fault indicator
light illuminates if any of the safety interlocks (FREEZE, FIRE, SMOKE)
open, or if the Thermal Motor Overload Relay trips.
CAUTION: When changing from Bypass to Normal, place the Bypass
Switch in the TEST position for five seconds before selecting Normal. Failure
to do so could result in damage to the ACS 502.
Note: The ACS 502 is disabled when BYPASS is selected. If the drive is to be
run while in BYPASS, a connection must be made between TB1:42 and
TB1:43. This should be done by a qualified service technician only.
CAUTION: Remove the jumper before switching from BYPASS to
NORMAL. Failure to do so could result in damage to the ACS 502.
Note: The Output contactor opens when the drive receives a stop command,
which will cause the motor to coast to a stop. If ramp to a stop is
required by the application, it will be necessary to install wires from
TB1:25 to TB1:40 and from TB1:26 to TB1:41. This will cause the
Output contactor to remain closed until the output frequency reaches
0 Hz when a stop command is received.
CAUTION: If BYPASS is selected, and the motor is not running because a
stop command is given, the motor will start when the drive is started.