Moeller DF51 - Reduced Response Time (RDY)

Setting parameters
10/05 AWB8230-1541GB
142
Reduced response time (RDY)
The response time is the internal transmission time of a control
signal from the time it is issued to the application of voltage at the
inverter (motor connection). The mean response time of the DF51
is about 38 ms (for example for the start signal from digital input
1 (FWD) to application of motor voltage. It can vary, however,
depending on the signal path and program size. Table 36 provides
a few example values.
A large proportion of the response time is due to the power
transistors’ so-called critical hold-off interval and the associated
filter time constants. With PNU b151 you can activate the
transistors directly and minimize the filter time constants. This
reduces the response time. The frequency inverter then changes
directly to RUN mode (RUN LED lit).
Table 36: Example for typical response times to start signal FWD
To activate the RDY function through one of digital inputs 1 to 5,
assign the value 52 (RDY) (PNU C001 to C005) to the
corresponding control signal terminal.
When you activate the digital input configured as RDY, the
transistors in the inverter are activated, filter time constants are
minimized and RUN mode is called (RUN LED lit).
j
Dangerous voltage!
With PNU b151 = 01 the output transistors are activated.
Output terminals U-V-W carry dangerous mains voltage,
even if the enable signal (FWD/REV) was not yet issued.
h
With PNU b151 = 01, RUN mode is selected and access
to some parameters is disabled.
PNU Name RUN b031
= 10
Value Function DS
b151 Inverter,
reduce
inverter’s
response time
(RDY) to a
control signal
j j 00 OFF 00
01 ON
Transistors active
Caution: Dangerous voltage (U-V-W)
Signal source
Digital input 1 Modbus (RS 485) CANopen (DE51-NET-CAN)
RDY OFF ON OFF ON OFF ON
Minimum [ms] 33.8 14.4 38.6 17.4 38.2 16.0
Maximum [ms] 42.4 21.8 46.4 27.0 53.0 34.6
Mean value [ms]
38.3 18.1 42.2 22.5 45.3 25.4
Hysteresis [ms] 8.6 7.4 7.8 9.6 14.8 18.6
Figure 147:Digital input 1 configured as FWD (start/stop clockwise
rotating field) and digital input 3 as RDY (ready).
j
Dangerous voltage!
The output transistors are activated and dangerous mains
voltage is present at output terminals U-V-W, even if the
enable signal (here FWD at terminal 1) was not yet issued.
RDY
FWD
P2413
h
In RUN mode, access to some parameters is blocked.
Figure 148:Example: Start signal and output frequency (response time)
a Start signal through optional DE51-NET-CAN
b Output frequency f
2
(phase L1) after about 48 ms (without RDY)
1
a
b
2
Ch1 10.0 V Ch2 20.0 V H 10.0 ms
11.00 %
A
Ch1
5.80 V
D : 400 mV
@ : –1.60 V
D : 46.8 ms
@ : –400 ms
Ch1 Freq
– – – – .Hz
Tek Stop
T
T
T