Yaskawa E7B Drive Bypass System - Manual (Page 43)

Yaskawa Electric America, Inc.
Installation Guide IG.E7B.02 Rev: 04-11
Date: 11-1-04 Page 41 of 46
BYPASS UNIT START UP PREPARATION
Note: These instructions assume that all jumpers and DIP switches are in the factory default position as defined by
schematic diagram E7B-10.
1. Review Bypass Technical Manual TM.E7B.01and any option instructions and schematics (E7B-10) 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 TM.E7B.01 Chapter 1, Physical Installation and
Chapter 2, Electrical Installation.
4. Inspect the security of the supply line power, ground connections and all control circuit connections as iden-
tified in TM.E7B.01 Chapter 2, Electrical Installation and “Control Wiring” in this document.
Double check all the power wires and motor wires.
Verify that the electrical supply power lines (L1, L2, L3) are connected to the input circuit breaker (CB1 on
the schematic E7B-10) and that the motor leads (T1, T2, T3) are connected to the output terminals of the
overload relay (S10 on the schematic E7B-10). Ensure that all connections are tight, loose wire connections
may cause intermittent problems or overheating. Factory connections sometimes come loose during ship-
ment.
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 TB1-9. No field pro-
gramming 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 _______________________________ Motor Rated Amps
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 or TM.E7.02 for programming details).
• Multi-function Digital Inputs
• Multi-function Digital Outputs
• Analog Outputs
• Differential PI control
10. Verify that the building automation system logic is ready for the start, stop and speed command functions.