Yaskawa E7B Drive Bypass System - Manual (Page 12)

Yaskawa Electric America, Inc.
Installation Guide IG.E7B.02 Rev: 04-11
Date: 11-1-04 Page 10 of 46
Remote Transfer to Bypass
Terminal TB1-4 on the Control PCB A2 is a dedicated terminal for “Remote Transfer” to Bypass operation.
This function allows a contact closure from a BAS, between terminals TB1-4 and TB1-9, to transfer motor operation
from Drive mode to Bypass mode. This remote transfer to Bypass function overrides the Drive Select manual button.
An open contact causes operation in Drive mode and a closed contact results in Bypass mode.
Smoke Purge Operation
Terminal TB1-5 on the Control PCB A2 is a dedicated terminal for “Smoke Purge” operation.
This function allows a contact closure between terminals TB1-5 and TB1-9 to transfer motor operation to Bypass for
a maximum capacity smoke control function. When in smoke purge mode, during emergency fire/smoke situations,
the motor overloads and safety interlock circuit are overridden to shift the priority to protecting people rather than
equipment. [Note: Smoke purge overrides all other control inputs and selector buttons. Smoke purge operation can
only be terminated by opening the contact closure at terminal TB1-5 or by opening the circuit breaker (CB1 on sche-
matic E7B-10).]
Multi-Function Digital Inputs
The Bypass 120 VAC logic circuit is interconnected with the Drive multi-function digital input terminals to allow a
single customer interface to control both Drive and Bypass circuits.
As a result, only Drive digital input terminals S6 and S7 are available for other uses. Drive Terminals S6, S7 and SN
have been brought out to TB5-5, TB5-4 and TB5-2 respectively. See Appendix A and Chapter 5 in TM.E7B.01,
parameter H1-04 and H1-05 for programming instructions.