2-20 Parameter Descriptions
7000-TD002A-EN-P – September 2007
Current Sensor Fault Code [Cur Sens FltCode]
Linear Number: 764
Access Level: Service
Read/Write: Read Only
This parameter in Diagnostic group helps in understanding why the drive tripped with a Current Sensor
fault. This feature is active only in inverter short circuit test modes and open-loop mode. The options are:
Bit Enum Text Description
0 HECS/CTError DC current measured from HECS and estimated from CT do not match
1 CT Phase Seq CT Phase Sequence is different from measured voltage sequence
2 CT Phs/Alpha Firing angle does not agree with phase angle of the rectifier current
3 Cap/CT Error Error in the measured and estimated line current
4 Motor HECS Motor HECS
5 Unused
6 Unused
7 Unused
8 Unused
9 Unused
10 Unused
11 Unused
12 Unused
13 Unused
14 Unused
15 Unused
Detailed explanation is as follows:
Drive compares the measured dc current feedback with the estimated dc current feedback from the line
current (capacitor compensation done on PWMR) and creates the fault Current Sensor if there is a large
difference (HECS/CTError bit in fault code). This protects the drive when starting (in test modes) with the
DC HECS unplugged, or backwards.
The phase sequence of the CT feedback (forward/reverse) is compared with the phase sequence of the
voltage feedback and a Current Sensor fault is generated if they are different (CT Phase Seq bit in fault
code).
When dc current is flowing, the drive compares the firing angle with the angle of the estimated rectifier
current and generates a Current Sensor fault if there is a large difference (CT Phs/Alpha bit in fault code).
On PWMR drives, when not gating (in short circuit and open-loop test modes) the drive compares the
measured capacitor current and expected capacitor current and generates a Current Sensor fault if there
is a large difference (Cap/CT Error bit in fault code).
In open-loop test mode, the drive compares the motor current feedback to the dc current feedback and
generates a Current Sensor fault if there is a large difference (Motor HECS bit in fault code).
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