IMO Jaguar CUB, Instruction Manual

Page: 106 / 170

5-34
E20, E27
Status Signal Assignment to [Y1], [30A], [30B] and [30C]
E20 and E27 may assign output signals to terminals [Y1] (transistor switch) and
[30A], [30B] and [30C] (mechanical relay contacts) which are general-purpose
programmable output terminals.
These function codes may also switch the logic system between normal and
negative to define how the inverter logic interprets either ON or OFF status of each
terminal.
Terminals [30A], [30B], and [30C] are mechanical relay contacts. In the normal logic,
if an alarm occurs, the relay will be ordinarily excited so that [30A] and [30C] will be
short-circuited, signaling an occurrence of the error to external equipment. On the
other hand, in the negative logic, the relay will cut off the excitation current to open
[30A] and [30C]. This may be useful for the implementation of fail-safe power sys-
tems.
When negative logic is active, the inverter switches all output signals to
the active side (for example, the alarm side). To avoid system malfunc-
tions caused by this, interlock the signals to keep them on using an
external power source.
Since terminals [30A/B/C] are mechanical relay contacts, they cannot
withstand frequent on/off operations. If frequent signal outputs are ex-
pected e.g., assigning any current limiter signal and activating the current
limiter actively, then use [Y1]. For rare signal outputs, e.g., for inverter
protection purpose, use [30A/B/C].
The service life of a mechanical relay contact is 200,000 on/off operations
at one-second intervals.
To keep explanations as simple as possible, the examples shown below are all
written for the normal logic system.
„
Inverter running (Speed > 0)--(RUN)
(Function code data = 0)
㩷
This output signal is used to tell the external equipment that the inverter is running
at a speed higher than 0. It switches on when the inverter output frequency exceeds
the starting frequency of the motor. It switches off when it is less that the starting
frequency or the inverter is DC-braking the motor.
„
Frequency equivalence--(FAR)
(Function code data = 1)
㩷
This signal is turned on when the difference between the output and set frequencies
comes into the allowable error zone (prefixed to 2.5 Hz).
„
Frequency detection--(FDT)
(Function code data = 2)
㩷
This signal is turned on when the output frequency of the inverter comes into the
frequency detection level specified by function code E31. It is turned off when the
output frequency drops lower than the detection level for 1 Hz (hysteresis band of
the frequency comparator: prefixed at 1 Hz).