Emb Safety Interlock; Emb Fire Mode - Danfoss VLT Option Panel Instruction Manual

EMB Safety Interlock

General Information
The safety interlock feature prevents the drive
or bypass from operating. For operation in
drive or bypass, the safety interlock input
contact must be closed. Only a fire mode
command to run in bypass overrides this
function.Safety inputs include, but are not
limited to, high and low pressure limit
switches, fire alarm, smoke alarm, high and
low temperature switches, and vibration
sensors.
Operation
When an external safety input closes, the
option panel is in operational mode. When
open, power is interrupted to all contactors
and relays and the bypass ignores all run
commands except for fire mode operation,
when enabled. When power is interrupted in
drive mode, the drive display indicates an
external fault, meaning the problem is exter-
nal to the drive. In some instances, a fault can
be caused by a failure within the option
panel, which will still be reported as an exter-
nal fault from the drive. A factory installed
jumper allows the unit to operate when no
safety input is connected. This jumper must
be removed when connecting in a safety
interlock circuit.
Safety Interlock Function Setup
• For EMB1 and EMB2, remove
factory-installed jumper between
terminals 5 and 6 on connector X55.
• Wire safety input to terminals 5 and 6
on connector X55.
• For EMB(0), wire safety input to
connector TB1, terminals 1 and 2.

EMB Fire Mode

General Information
The fire mode function is built-in. Fire mode
runs the motor at full speed in bypass and is
intended to ignore common safety, overload,
and bypass switch inputs in emergency
situations. The motor will continue to run in
bypass until fire mode is removed or the unit
fails.
Prior to Enabling Fire Mode
• Complete the start-up procedure to
verify motor rotation direction in
bypass is correct and that the system
is ready in all respects for continuous
full speed operation in bypass.
Operation
• Activation of fire mode is accom-
plished by closing connector X55,
input terminals 7 and 8.
• When activated, a relay overrides the
safety circuit, motor overload, and
bypass switch (SW1) position.
• Fire mode is deactivated only when
removed or fuses blow.
• Fire mode status can be reported
through connector X55, terminals 9
and 10, a normally open dry contact
that closes when fire mode is active.
Fire Mode Function Setup
• Wire fire mode input to connector
X55, terminals 7 and 8.
• Wire fire mode status output to con-
nector X55, terminals 9 and 10.
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