is either disconnected from the load or the coupling mechanism is faulty. If the motor is
allowed to run in this condition, it may aggravate the fault in the coupling mechanism or
harm the personnel handling the machine. Therefore, the motor has to be disconnected
from the power supply as soon as the above condition is detected.
37M detects the condition by monitoring the current values and helps disconnect the
motor from the power supply instantaneously or after a delay according to the
requirement.
When the motor is at standstill, the current will be zero and it is not recommended to
activate the trip during this time. The minimum current drawn by the motor when it is
connected to the power supply is the no load current, that is, the higher pickup value
current. If the current drawn is below the lower pickup value current, the motor is
disconnected from the power supply. 37M detects this condition and interprets that the
motor is de-energized and disables the function to prevent unnecessary trip events.
4.1.7.6 Signals
Table 293: 37M Input signals
Name Type Default Description
I_A SIGNAL 0 Phase A current
I_B SIGNAL 0 Phase B current
I_C SIGNAL 0 Phase C current
BLOCK BOOLEAN 0=False Block all binary outputs by resetting timers
Table 294: 37M Output signals
Name
Type Description
TRIP BOOLEAN Trip
PICKUP BOOLEAN Pickup
4.1.7.7 Settings
Table 295: 37M Group settings (Basic)
Parameter
Values (Range) Unit Step Default Description
Pickup value low 0.01...0.50 xIn 0.01 0.10 Current setting/Pickup value low
Pickup value high 0.01...1.00 xIn 0.01 0.50 Current setting/Pickup value high
Trip delay time 400...600000 ms 10 2000 Trip delay time
1MAC059074-MB A Section 4
Protection functions
615 series ANSI 291
Technical Manual
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