EQ7 Series Instruction Manual - TECO-Westinghouse Motor Company

E64
Saving of Digital Reference Frequency
E64 specifies how to save the reference frequency specified in digital formats by the / keys on the keypad
as shown below.
Data for E64
0
1
Function
Automatic saving when the main power is turned OFF
The reference frequency will be automatically saved when the main power is turned OFF.
At the next power-on, the reference frequency at the time of the previous power-off applies.
Saving by pressing key
Pressing the key saves the reference frequency. If the control power is turned OFF
without pressing the key, the data will be lost. At the next power-ON, the inverter uses
the reference frequency saved when the key was pressed last.
E65
Reference Loss Detection (Continuous running frequency)
When the analog frequency command (setting through terminal [12], [C1], or [V2]) has dropped below 10% of the
reference frequency within 400 ms, the inverter presumes that the analog frequency command wire has been
broken and continues its operation at the frequency determined by the ratio specified by E65 to the reference
frequency. Refer to E20 through E24 and E27 (data = 33).
When the frequency command level (in voltage or current) returns to a level higher than that specified by E65, the
inverter presumes that the broken wire has been fixed and continues to run following the frequency command.
In the diagram above, f1 is the level of the analog frequency command sampled at any given time. The sampling is
repeated at regular intervals to continually monitor the wiring connection of the analog frequency command.
- Data setting range: 0 (Decelerate to stop), 20 to 120%, 999 (Disable)
Avoid an abrupt voltage or current change for the analog frequency command. An abrupt change may be
interpreted as a wire break.
Setting E65 data at "999" (Disable) allows the REF OFF signal ("Reference loss detected") to be issued,
but does not allow the reference frequency to change (the inverter runs at the analog frequency
command as specified).
When E65 = "0" or "999," the reference frequency level at which the broken wire is recognized as fixed is
"f1 0.2."
When E65 = "100" (%) or higher, the reference frequency level at which the wire is recognized as fixed is
"f1 1."
The reference loss detection is not affected by the setting of analog input adjustment (filter time
constants: C33, C38, and C43)
4-103