Omron SYSDRIVE MX2 SERIES, User Manual

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6 Vector Control and Applied Functions
Multi-function Compact Inverter 3G3MX2-V1 User’s Manual (I585-E1)
6-5 V/f
Con
tro
l wit
h
S
p
eed
Fee
dbac
k
6
6-
5-3 Pro
tective Detectio
n under
V
/f
Contro
l with S
peed Fe
edback
The V/f control with speed feedback performs the following protective detection based on the speed
feedback data.
Use these functions according to your application.
z Overspeed error detection
If the speed feedback value exceeds the value set in the Overspeed Error Detection Level (P026),
the inverter detects the E81.
(Overspeed error) and shuts off the output (trip). Set the detection
level appropriately depending on the maximum speed allowable for your application.
z Speed deviation excessive detection
If the deviation of the actual frequency from the frequency reference value exceeds the value set in
the Speed Deviation Excessive Level (P027), the inverter outputs the excessive speed deviation sig-
nal (DSE). Although the inverter outputs this signal, it does not shut off its output (trip).
In this case, set the Multi-function Output P1/P2 Selection (C021/C022), or the Multi-function Relay
Output (MA, MB) Function Selection (C026), to 22 (DSE: Excessive speed deviation). In addition,
construct such a sequence that stops the control if the inverter outputs the excessive speed devia-
tion signal (DSE).
z
Encoder disconnection detection
When the inverter outputs the frequency set in the Creep Speed Setting (P015) or higher, if the
speed feedback value does not reach the Starting Frequency (b082) within the Encoder Disconnec-
tion Detection Time (P077), the inverter detects the E80.
(Encoder disconnection error) and shuts
off the output (trip).
If the inverter falsely detects this error, for example, when it operates with a heavy load and is slow
to start, some adjustment is required. Use the Creep Speed Setting (P015) and Encoder Disconnec-
tion Detection Time (P077) to set speed and time values that allow the inverter to start stably in your
application.
6-5-3 Protective Detection under V/f Control with Speed Feedback
Parameter
No.
Function name Data
Default
data
Unit
P015 Creep Speed Setting Starting Frequency to 10.00 5.00 Hz
P026
Overspeed Error
Detection Level
0.0 to 150.0
*1
*1. Set this in units of percentage as 100% of the 1st Maximum Frequency (A004).
115.0 %
P027
Speed Deviation
Excessive Level
0.00 to 99.99
100.0 to 120.0
10.00 Hz
P077
Encoder Disconnection
Detection Time
0.0: Disconnection detection disabled
1.0 s
0.1 to 10.0
C021, C022
Multi-function Output P1,
P2 Selection
22: DSE (Excessive speed deviation)
− −
C026
Multi-function Relay Out-
put (MA, MB) Function
Selection
05
−