Chapter 6 – Parameters
ACH 500 Programming Manual
6-31
PRE SPEED7
The ACH 500 drives the motor at a preset speed selected with Parameter
10.3.8 (Preset Speed 7) when in external mode.
Note: If the selected control location is Keypad, the ACH 500 stops in case of
serial communication fault.
2 AI < MIN FUNCTION
This parameter allows you to select the preferred operation in case Analog
Input (1 or 2) (whichever is being used at that time) signal drops below the
minimum setting, provided the minimum is set at 0.3 V/0.6 mA or above
(“living zero”).
NO
No activity wanted.
WARNING
Warning indication on display.
FAULT
Fault indication on display and the drive stops according to the setting of
Parameter 20.2.3 (Stop Function).
PRE SPEED7
Fault indication on display and the output frequency goes to the value set by
Parameter 10.3.8 (Preset Speed 7).
LAST SPEED
Fault indication on display and the output frequency goes to the last speed
(average over the last 10 seconds).
3 MOT TEMP FLT FUNC
This parameter defines the operation of the motor thermal protection function.
NO
No activity wanted.
WARNING
Warning indication is displayed when the motor temperature reaches the
warning level (95 percent of the nominal value).
FAULT
Displays a warning indication at warning level. Displays a fault indication and
stops the ACH 500 when the motor temperature reaches 100 percent level.
The motor connected to the ACH 500 can be protected from overheating by
motor thermal protection. The ACH 500 calculates the temperature rise of the
motor using the following assumptions:
•
The ambient temperature is 104
°
F (40
°
C).
•
The motor is at ambient when power is applied to the ACH 500.
•
When stopped, the motor cooling time is four times the cooling time when
running.
