Eaton MVX9000 - Group 70: Protective Functions

Group 70 — Protective Functions
5-54 MVX9000 User Manual
Descriptions of
Parameter Settings
Group 70 — Protective Functions
70.01
Over-Voltage Stall
Prevention
Range: Default: 01
00 Disable Over-Voltage Stall Prevention
01 Enable Over-Voltage Stall Prevention
During deceleration, the AC drive’s DC bus voltage may
exceed its maximum allowable value due to motor
regeneration. When this function is enabled, the AC drive will
stop decelerating, and maintain a constant output frequency.
The drive will resume deceleration when the voltage drops
below the factory-preset value.
Note: With moderate inertia loads, over-voltage during
deceleration will not occur. For application with high inertia
loads, the AC drive will automatically extend the deceleration
time. If deceleration time is critical for the application, then a
dynamic braking resistor should be used.
Figure 5-47: Over-Voltage Stall Prevention
70.02
Over-Current Stall
Prevention during
Acceleration
Range: Default: 150%
00: disable
20 to 200%: enable
Unit: 1%
A setting of 100% is equal to the Rated Output Current of the
drive.
Under certain conditions, the AC drive output current may
increase abruptly, and exceed the value specified by 70.02.
This is commonly caused by a rapid acceleration or excessive
loading on the motor. When 70.02 is enabled, the AC drive
will stop accelerating and maintain a constant output
frequency. The AC drive will only resume acceleration when
the current drops below the value set in 70.02.
DC Bus Voltage
Time
Over-Voltage
Detection
Level
Output
Freq.
Time