Bypass Options; Common Run/Stop With Bypass; Automatic Bypass; Run Permissive In Bypass - Trane VLT AQUA Drive FC 202 VLT AutomationDrive FC 301 Instruction Manual

Introduction
Contactor Drive Mode OFF
1 1
M1 Closed
M2 Closed
M3 Open
Table 1.1 Contactor Operation
INPUT
POWER
Figure 1.1 Basic Non Bypass Circuit

1.3 Bypass Options

1.3.1 Common Run/Stop with Bypass

Allows a remote signal to initiate operation in either drive
control or bypass depending upon the position of the
bypass selector switch.

1.3.2 Automatic Bypass

This feature automatically transfers the motor from drive to
bypass without operator intervention when a fault
condition trips the drive, after a programmable time-out
period. The VFD's internal fault circuitry controls this
action. The time delay permits all automatically resettable
faults to clear prior to transfer to bypass. Run permissive or
safety circuit signals override the auto bypass function and
may prevent or delay bypass operation.

1.3.3 Run Permissive in Bypass

With run permissive active, the drive sends a run request
and waits for a remote response before commanding the
motor to start. The response indicates the system is safe to
operate.
1-2
Vertical Bypass/Non Bypass Panel
Bypass
Mode
Open Open
Open Open
Open Closed
DRIVE
DISCONNECT
1L1
L1
1L2
L2
L3 1L3
DS1
MG.13.A1.22 - VLT
Test Mode
Closed
Open
Closed
VFD
2L1
L1/91
Fuse
TYPE 1 ENCLOSURE
2L2
L2/92
Fuse
2L3
L3/93
Fuse

1.3.4 Basic Fire Mode in Bypass

This option switches the panel to bypass whenever a
remote fire mode signal is given to the VFD through the
input terminals. In either drive or bypass, fire mode is
intended to ignore common safety and overload inputs for
emergency situations. The motor will continue to run in
bypass until fire mode is removed or the drive, panel, or
motor fails. External safety signals and motor overload are
ignored when in fire mode.

1.3.5 Advanced Fire Mode in Bypass

The advanced fire mode allows for a variety of
programmable responses to an external fire mode
command signal. Bypass options are programmed through
the drive's fire mode parameters. See 6.1.13 ECB Advanced
Fire Mode.

1.3.6 Overload Protection

This thermally activated device provides mechanical
overload protection for the motor while in bypass
operation. It measures motor current and is set to the full
load amps (FLA) of the motor. A 1.2 x FLA service factor is
built-in and maintained, meaning that should the motor
current increase above that value, the overload will
calculate the level of increase to activate timing for the trip
function. The higher the current draw, the quicker the trip
response. The overload provides Class 20 motor protection.
®
is a registered Danfoss trademark
CUSTOMER SUPPLIED
AC MOTOR.
U/96
T1
V/97
T2
T3
W/98
EARTH
GROUND