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FAULT: this relay output signal is closed when any
system fault condition is detected. To detect the
type of failure the serial protocol is needed (see
the para. "RS232-485 Comunication Description").
SET POINT: this relay output signal is enabled
when the reference quantity chosen (frequency, cur-
rent or time) is higher than the set threshold. The
signal can be "active close", or "active open". More-
over, if the reference quantity is the frequency or the
current drawn, it is possible to set the hysteresis (in
% of the threshold value) to avoid bouncing.
For example:
- reference quantity: frequency (window 101=0)
- threshold: 500 Hz (window 102=500)
- hysteresis: 1% (window 103=1)
- activation type: "active close" (window 104=1)
The set point output stays open until the frequency
becomes higher than 505 Hz (that is 500 Hz + 1%
of 500 Hz), then the output goes closed and stays
colsed until the frequency becomes lower than 495
Hz (that is 500 Hz – 1% of 500 Hz).
It is possible to mask the set point checking for a
programmable mask time (window 103).
The SET POINT signal has the following default
settings:
- reference quantity: controller status
- thereshold: not relevant
- hysteresis: not relevant
- activation type: active close (NO)
- delay time: 0 second
NOTE
The Navigator Software ver. 3.0 (optional) or any
user developed serial communication software
(according to RS 232-485 Communication Proto-
col) allows the operator to set all the programma-
ble feature.
When no external input-output device is available
the J1 connector must be closed with the supplied
mating connector that short-circuits the START
and INTERLOCK inputs with the GROUND input.
Electrical connections examples:
•
Start-Stop or Interlock
Instead of switch is possible to use transistor.
•
Soft Start, Speed Setting, Purge, Vent
75
TECHNICAL INFORMATION
87-900-968-01(C)
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