Setting 1: Continue Operation with Reduced Frequency Reference
The drive will continue operation at the frequency reference value set in parameter L4-06. When the external frequency
reference value is restored, the operation is continued with the frequency reference.
n
L4-06: Frequency Reference at Reference Loss
Sets the frequency reference level the drive runs with when L4-05 = 1 and a reference loss was detected. The value is set
as a percentage of the frequency reference before the loss was detected.
No.
Name
Setting Range
Default
L4-06
Frequency Reference at Reference Loss
0.0 to 100.0%
80.0%
n
L4-07: Speed Agreement Detection Selection
Determines when frequency detection is active using parameters L4-01 through L4-04.
No.
Name
Setting Range
Default
L4-07
Speed Agreement Detection Selection
0 or 1
0
Setting 0: No Detection During Baseblock
Setting 1: Detection Always Enabled
n
Notes on Controlling the Brake for the Hoist Application
• The frequency detection function is used for controlling the brake.
When an external Baseblock command is present while a Run command is active, the frequency reference will be kept
as long as the Run command is active. To avoid improper brake operation make sure that frequency detection is set so
that the brake does not open during Baseblock (L4-07 = “0”, default).
Brake Open/Close
Brake Activation Level
Function
Parameter
Signal
Parameter
Frequency
Detection
Conditions
L4-07 = 0
Frequency Detection Level
L4-01 = 2.0 to 3.0 Hz
<1>
Frequency
Detection 2
H2-01 = 5
Frequency Detection Width
2.0 Hz (fixed)
<1>If the load slips during stop, make it greater than E1-09 or 2.0 Hz until the load no longer slips.
2.0 Hz (fixed)
L4-01
OFF
ON
Time
Output
Frequency
Frequency
Dectection 2
Figure 5.84 Frequency Detection 2
• The braking sequence should be designed as follows:
• A normally open signal (N.O.) should be used to control the brake so that it is released when terminal MA-MC closes.
• An external circuit should be added to ensure the brake is fully applied in case of a fault or emergency condition.
• An additional external circuit should also be added to ensure the brake releases properly when an Up/Down Command
is entered.
• When changing the speed using an analog signal, make sure that the source of the frequency reference is assigned to the
control circuit terminals (b1-01 = 1).
• A sequence to open and close the holding brake appears in the diagram below.
Time
UP
S1-SC
OFF
d1-03
d1-01 (Enabled when b1-01 = 0)
L4-01
b4-01
OFF
DC Injection braking
ON
ON
MA-MC
Holding brake
Output frequency
0
Frequency Detection 2
(H2-01=5)
Closed
Closed
Open
b6-02
b6-01
Output
Figure 5.85 Holding Brake Time Chart
5.8 L: Protection Functions
198
SIEP C710606 20 OYMC AC Drive - V1000 User Manual
7/16/2008-13:23