BENSHAW RSi H2 Series - Page 208

Parameter Descriptions
196
890053-00-02
10 seconds before the loss of the speed reference and
uses it as the speed reference.
4
Hold Output
The inverter calculates the average output value for
10 seconds before the loss of the speed reference and
uses it as the speed reference.
5
Lost Preset
The inverter operates at the frequency set at PRT- 14
(Lost Preset F).
PRT-15
AI Lost Level
PRT-13
Lst Cmd Time
Configure the voltage level and time delay for speed reference loss
detection when using analog input.
Setting
Function
0
Half of x1
Based on the minimum analog input values set at IN-
08 (V1), IN-12 (V1’), IN-38 (V2) and IN-53 (I2),
protection operates when the input signal is reduced to
half of the initial value of the analog input and after the
time (PRT-13) has expired.
Example: Set the speed reference to ‘5 (I2)’ at DRV-07,
and set IN-53 (I2 min.) to 4 mA. When the 4mA input
drops to less than half (2mA), the protective function is
activated after the set time (PRT-13).
1
Below of x1
The protective function operates when the analog input
signal falls below the minimum values set at IN-08
(V1), IN-12 (V1’), IN-38 (V2) and IN-53 (I2) and after
the time (PRT-13) has expired.
NOTE: If the minimum value of the analog input is ‘0’, the LostCmd function
does not operate.
PRT-14
Lost Preset F
To run at a fixed speed, set the operation mode (PRT-12 Lost Cmd Mode) to
‘5 (Lost Preset)’. When the protection function operates, this sets the
frequency for continued operation.
EX: Speed Ref Loss below 5V. Set IN-06 (V1 Polarity) to ‘Unipolar’ and IN-08 to ‘5 (V)’. Set PRT-
15 (AI Lost Level) to ‘1 (Below x1)’ and PRT-12 (Lost Cmd Mode) to ‘2 (Dec)’ and then set PRT-13
(Lost Cmd Time) to 5 seconds. Then the inverter operates as follows:
Note
When using communications or RS-485 for speed reference, if speed reference is lost the
protection operates based on the time set at PRT-13 (Lost Cmd Time).