TECO-Westinghouse F510 Series, Instruction Manual

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- Monitor the DC voltage filter output by 12-20 (DC voltage filter value).
- Set the DC voltage filter decrease rate (11-34) to a greater value than the value of the DC voltage
filtering increase rate (11-33).
2) When the inverter is operation at a fixed output frequency, the OVP function will monitor the DC-bus
voltage to detect regenerative operation.
In case of a regenerative condition the inverter calculates the delta DC bus voltage value and multiplies
the value with parameter 11-36, the result is added to the frequency reference accelerating the motor to
prevent on an overvoltage condition.
When the regenerative energy decreases, the inverter output frequency will return to the actual frequency
reference. Deceleration rate is based on the DC voltage, as shown in Figure 4.3.80.c.
Figure 4.3.80.c OVP deceleration time
3) When the inverter is stopped, the deceleration rate can be set with parameter 00-15 (Tdec1). In case
the DC voltage is too high, the inverter will decelerate based on the OVP deceleration time as shown in
Figure 4.3.92.
- Set DC-bus voltage in parameter 11-38 (start voltage of OVP deceleration) and set OVP deceleration
rate in 00-22 (Tdec3).
- When the DC voltage reaches this level, it is necessary to decelerate rapidly in order to prevent the
delta DC voltage of becoming too large.
- When DC voltage reaches the setting of 11-39 (stop voltage of OVP deceleration), it will decelerate
based on the set value of 00-24 (Tdec4)
- Deceleration rate is linear based on the slope defined by the start point (11-38) and end point (11-39).
4). Enable the OVP function with parameter 11-40 set to 1 or 2. The following parameter default values will
be changed when the OVP function is enabled:
00-14(Tacc1)= 5.0 Sec(the frequency reference acceleration rate when DC voltage is too high.)
00-22(Tdec3)= 20.0 Sec(low setting point of OVP deceleration rate).
00-24(Tdec4)= 100.0 Sec(high setting point of OVP deceleration rate).
Note: S curve should be disabled when using the OVP function (11-04~11-07=0.0sec).
When 11-40=2: OV prevention Mode 2
OVP
Deceleration
Time
00-24
(Tdec 4)
00-22
(Tdec 3)
700V 750V
OVP
Deceleration
Start (11-38) OVP
Deceleration
Stop (11-39)
DC bus
voltage