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.
1.4 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 5 Electromechanical Bypass
(EMB) Operation for additional details on the EMB and
6 Electronically Controlled Bypass (ECB) Operation for the
ECB.
Control Feature EMB(0) EMB1 EMB2 ECB
Safety Interlock X X X X
Common Start/
Stop
X X X
Automatic Bypass X X
Run Permissive in
Bypass
X X
Basic Fire Mode X X
Advanced Fire
Mode
X
Serial Communi-
cation
X
Table 1.2 Bypass Configurations
Illustration 1.2 Bypass Circuit with Options
Introduction Option Panel Operating Instructions
6 MG14I102 - VLT
®
is a registered Danfoss trademark
11
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