Bypass Platform Configurations; Bypass Circuit With Options; Bypass Configurations - Danfoss VLT Option Panel Instruction Manual

Run permissive in bypass. With run permissive
active, the drive sends a run request and waits for a
remote response to before notifying the motor to
start. The response indicates the system is safe to
operate.
Basic fire mode in bypass. This option switches
the panel to bypass whenever a remote fire mode
command 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 in emergency situations. The motor will
continue to run in bypass until fire mode is removed
or the drive or option panel fail. External safety
signals and motor overload are ignored when in fire
mode.
Advanced fire mode in bypass.
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 fire mode
section of the drive manual and support
materials for available options.
The advanced
Figure 1-2. Bypass Curcuit with Options
Overload protection. This thermally activated device
provides mechanical overload protection for the
motor(s) 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. It provides Class 20 motor protection.

Bypass Platform Configurations

The EMB is available in three platforms: EMB(0),
EMB1, and EMB2. The features available as options
with each platform are listed in Table 1-2. The ECB,
also listed below, has all option features available.
See Section 5 for additional details on the EMB and
Section 6 for the ECB.
Table 1-2. Bypass Configurations
Control Feature
Safety Interlock
Common Start / Stop
Automatic Bypass
Run Permissive in Bypass
Basic Fire Mode
Advanced Fire Mode
Serial Communication
EMB(0) EMB1 EMB2 ECB
X X X
X X
X
X
X
X
X
X
X
X
X
X
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