Yaskawa P7B Drive Bypass - Manual (Page 85)

Start Up and Operation 4 - 3
BYPASS START UP PREPARATION
! 1. Review this Bypass Technical Manual and any option instructions and schematics shipped with the Drive and Bypass
unit.
! 2. Verify that the model numbers and voltage ratings are as specified in the purchase order by matching the nameplate
data for each unit to the purchase order.
! 3. Verify that the unit has been installed in accordance with Chapter 1, Receiving and Mechanical Installation and
Chapter 2, Electrical Installation.
! 4. Inspect the security of the supply line power, ground connections and all control circuit connections as identified in
Chapter 2, Electrical Installation.
Double check all the power wires and motor wires.
Verify that the electrical supply power lines are connected to the input circuit breaker and that the motor leads are
connected to the output terminals of the overload relay. Ensure that all connections are tight, loose wire connections
may cause intermittent problems or overheating. Factory connections sometimes come loose during shipment.
! 5. Review the installer’s “as wired” schematic. Determine if a driven motor “safety circuit” is connected. This is a series
circuit of NC contacts from devices such as a smoke/fire sensor, freeze-up thermostat or high static pressure limit
switch. Verify that these customer emergency contacts are properly terminated in the Bypass safety shutdown circuit.
These contacts should be wired between terminal TB1-1 and TB1-2. No field programming is required.
Verify that all other field installed wires are correctly terminated (included the shields).
! 6. Verify that the motor is wired for the application voltage. Record the motor nameplate information:
Voltage _____________________________ Full Load Amps (FLA) _________________________________
(or Rated Load Amps (RLA)
! 7. Verify that the input voltage matches the Bypass unit rating.
! 8. Verify that the motor rated full load amps (FLA) does not exceed the rated output current of the Drive and Bypass
controlling it. When multiple motors are simulaneously operated by the Drive, the sum of all motor FLA values must
be less than or equal to that of the Drive and Bypass controlling them.
! 9. Record any other connections to the Bypass unit, by terminal number to determine if special programming of any of
the following is required. (see Chapter 5 for programming details).
• Multi-function Digital Inputs
• Multi-function Digital Outputs
• Analog Outputs
• Differential PI control
! 10. Verify that the customer supplied logic is ready for the start, stop and speed command functions.