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3.7 External Interlock
u
Remote Transfer to Bypass
Terminal TB2-4 is a programmable input with a default setting of "Remote Transfer to Bypass" operation. The function of
this terminal can be changed using bypass parameter Z2-04.
This function allows a contact closure from a BAS, between terminals TB2-4 and TB2-10, to transfer motor operation from
Drive mode to Bypass mode. An open contact allows operation in Drive mode and a closed contact allows operation in Bypass
mode.
u
Smoke Purge Operation
Terminal TB2-5 is a programmable input with a default setting of "Smoke Purge" operation. The function of this terminal can
be changed using bypass parameter Z2-05.
This function allows a contact closure between terminals TB2-5 and TB2-10 to transfer motor operation to bypass for smoke
purge operation. The motor overload and Safety Interlock circuit are overridden during smoke purge or in emergency fire/
smoke situations to place priority on personnel protection.
Note:
Smoke purge overrides all control inputs and bypass selector buttons. Smoke purge operation can only be terminated by opening the contact
closure at terminal TB2-5 or by opening the disconnect switch.
u
Spare Multi-Function Digital Inputs
Terminals TB2-6 and TB2-7 are spare programmable inputs. The bypass +24 V logic circuit is interconnected with the drive
multi-function digital inputs to allow a single customer interface to control both drive and bypass circuits. The function of
these terminals can be set using bypass parameters Z2-06 and Z2-07.
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YASKAWA SIEP YAIZ1D 01C Z1000U HVAC MATRIX Drive Bypass Technical Manual
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