Beijer Electronics BFI-H2 V1.12 - Manual (Page 37)

User Guide Revision 1.12
37
The main selector switch selects between the following modes.

System Off : Drive is powered off; Bypass contactor is off

Bypass Control : Drive is powered off; Bypass contactor is on, motor running from bypass supply

Drive Control : Drive is powered on; Bypass or Drive Output contactor selection is controlled by the drive
When the Main Selector Switch is set to Drive Control, the drive input contactor is switched in such that the drive will power up. Selection of
the two motor output contactors is controlled by the drive dependent on the settings provided to the drive by the user. When drive control is
selected the drive can co-ordinate bypass or drive control based on the settings and running conditions of the drive.
The two drive control relays (relay 1 and relay 2) are automatically configured when Bypass Mode is enabled. Relay 1 is configured for bypass
control and is connected directly to the Bypass contactor. Relay 2 is configured for drive control and is connected directly to the Drive Output
Contactor. Under normal operation the drive will close relay 2, bringing in the Drive Output contactor, and operation of the motor will be as
per the logic and speed reference configuration of the drive.
The drive will switch off the Drive Output contactor (relay 2) and switch in the Bypass contactor (relay 1) if one of the bypass control functions
is enabled and the logic to trigger that function becomes true. Bypass control functions include:

Bypass on Fault Drive will switch to bypass if a trip condition prevents the drive from operating the
motor

Bypass on Fire Mode Drive will switch to bypass if the Fire Mode function is assigned to a digital input and
that input becomes true (can be open active or close active)

Bypass on Input Drive will switch to bypass if a digital input is assigned to bypass control (through
menu 9) and that input becomes true.
Note: A combination of bypass conditions is permitted.
Bypass on Fault.