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260 Unidrive M702 User Guide
Issue Number: 3
Inductance Inductance measurement out of range or motor saturation not detected
8
The drive has been enabled in RFC-S mode with RFC Feedback Mode (03.024) set for sensorless control, or for auto-
change over on position feedback loss, and the motor inductance will prevent the control algorithm from operating correctly.
The reason for the trip can be identified from the sub-trip number.
Inductor Too Hot The regen inductor has overloaded
93
In Regen mode, this trip indicates a regen inductor thermal overload based on the Rated Current (Pr 05.007) and the
Inductor Thermal Time Constant (Pr 04.015). Pr 04.019 displays the inductor temperature as a percentage of the maximum
value. The drive will trip on Inductor Too Hot when Pr 04.019 gets to 100 %.
Recommended actions:
• Check the load / current through the inductor has not changed.
• Ensure the Rated Current (Pr 05.007) is not zero.
I/O Overload Digital output overload
26
The I/O Overload trip indicates that the total current drawn from 24 V user supply or from the digital output has exceeded
the limit. A trip is initiated if one or more of the following conditions:
• Maximum output current from one digital output is 100 mA.
• The combined maximum output current from outputs 1 and 2 is 100 mA
• The combined maximum output current from output 3 and +24 V output is 100 mA
Recommended actions:
• Check total loads on digital outputs
• Check control wiring is correct
• Check output wiring is undamaged
Island Island condition detected in regen mode
160
The Island trip indicates that the AC mains is no longer present and the inverter would be on ‘islanded’ power supply if it
continued to operate.
Recommended actions:
• Check the supply / supply connections to the regen drive
Keypad Mode Keypad has been removed when the drive is receiving the speed reference from the keypad
34
The Keypad Mode trip indicates that the drive is in keypad mode [Reference Selector (01.014) = 4 or 6] and the keypad has
been removed or disconnected from the drive.
Recommended actions:
• Re-install keypad and reset
• Change Reference Selector (01.014) to select the reference from another source
Line Sync Synchronization to the power supply has been lost
39
The Line Sync trip indicates that the inverter has lost the synchronization with the AC supply in Regen mode.
Recommended actions:
• Check the supply / supply connections to the regen drive
Trip Diagnosis
Sub-trip Reason
1
The difference between Ld (05.024) and No-load Lq (05.072) is too small. (Lq-Ld)/Ld
must be greater than 0.2. Also Lq-Ld must be greater than K/Full Scale Current Kc
(11.061), K is related to the drive voltage rating as given in the table below. It is
recommended that the differences are larger than these minimum limits if possible.
2
A test is carried out to determine the direction of the flux in the motor which relies on
detecting motor saturation. If a change in motor saturation cannot be detected during this
test then this trip is initiated. This type of failure is unlikely in most normal motors.
3
During the stationary auto-tuning in RFC-S mode it is necessary to determine the
location of the flux axis. If a change in motor saturation cannot be detected during this
test then this trip is initiated. This type of failure is unlikely in most normal motors.
Drive rated voltage K
200 V 0.037
400 V 0.073
575 V 0.087
690 V 0.105
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