Q2 Q2A, Technical Manual

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12.8 L: PROTECTION
760 SIEPYEUOQ2A01G AC Drive Q2A Technical Manual
Figure 12.118 Example: Protection Circuit Configuration to Connect More than One Motor to One Drive
NOTICE: When one drive is operating more than one motor at the same time or when the rated current of the motor is much
larger than rated current of a standard motor, you cannot protect the motor with electronic thermal protection. To protect each
motor, set L1-01 =1 [Motor Cool Type for OL1 Calc = VTorque], configure the circuits, then add thermal relays to each motor.
The magnetic contactor installed for motor protection cannot be switched ON/OFF during run. Failure to obey can cause motor
failure.
1 : VTorque
Use this setting for general-purpose motors with a 60 Hz base frequency.
The overload tolerance decreases as motor speed decreases because the cooling fan speed decreases and the ability
of the motor to cool decreases in the low speed range.
The overload tolerance characteristics of the motor change the trigger point for the electronic thermal protector.
This provides motor overheat protection from low speed to high speed across the full speed range.
Load Tolerance Cooling Capability
Overload Characteristics
(at 100% motor load)
This motor is designed to operate with commercial line
power. Operate at a 60 Hz base frequency to maximize
the motor cooling ability. If the motor operates at frequencies less than 60 Hz, the
drive will detect
oL1 . The drive triggers a fault relay
output and the motor coasts to stop.
2 : CT 10:1 Speed Range
Use this setting for drive-dedicated motors with a speed range for constant torque of 1:10.
The speed control for this motor is 10% to 100% when at 100% load. Operating slower than 10% speed at 100%
load will cause motor overload.
Load Tolerance Cooling Capability
Overload Characteristics
(at 100% motor load)
This motor is designed to withstand increased
temperatures during continuous operation in the low
speed range (10% base frequency). The motor operates continuously at 10% to 100% base
frequency. Operating slower than 10% speed at 100%
load will cause motor overload.
3 : CT 100:1 SpeedRange
Use this setting for vector motors with a speed range for constant torque of 1:100.