Forward Rotation Signal (Fwr) (C021,C026); Reverse Rotation Signal (Rvr) (C021,C026); Major Failure Signal (Mja) (C021,C026) - Hitachi NES1-004SB Quick Reference Manual

Chapter 7 Explanation of Functions
7.8.19 Reverse rotation signal (RVR)
The inverter continues to output the forward rotation (RVR) signal while it is driving the motor for reverse
operation.
The RVR signal is turned off while the inverter is driving the motor for forward operation or stopping the
motor.
Item
Terminal function
Alarm relay terminal function
Output frequency (Hz)
Forward rotation signal
Reverse rotation signal
7.8.20 Major failure signal (MJA)
The inverter outputs the major failure (MJA) signal in addition to an alarm signal when it trips because of
one of the errors listed below.
No.
Item
Terminal function
Alarm relay terminal function
Function code
C021
C026
Error code
1 E08.* Memory error
Current detection error
2 E10.*
3 E11.* CPU error
4 E14.* Ground-fault protection
5 E19.* Inverter thermal detection system error
Function code
C021
C026
Data or range of data
52
Description
Data or range of data
53
7 - 74
Description
RVR: Reverse rotation signal
Description
MJA: Major failure signal