Yaskawa Varispeed-656 DC5 Converter - Manual (Page 14)

VS-656DC5 User’s Manual
12 - 20
6. Notes on PWM Converter Application
6.1 Total Load
The total load should be within the rated output of the converter.
6.2 Inverter Sequence Wiring
An interlock is necessary between the VS-656DC5 and the inverter to stop the inverter
using a VS-656DC5 fault signal. It is also necessary to ensure the restart timing when
restarting the inverter after a momentary power loss.
Ensure the timing using the “Running” (set value = 00) signal output from the control ter-
minal of the VS-6556DC5. When the “Running” signal is “Open”, use the inverter exter-
nal base block input, etc. as the inverter output termination signal.
[Interlock Examples]
(1) When not Restarting After Momentary Power Loss (Coast to stop after momen-
tary power loss)
Insert the converter “MC Running” output into the inverter “External Error” input.
Assume the inverter “External Error” input to be the b contact input, and select
“Accept external errors only while running” to prevent external error operation while
power is ON.
(2) When Restarting as a System After Momentary Power Loss
Insert the converter “MC Running” output into the inverter “External BB” input.
Select “momentary power loss ride through” on the inverter side, and select either
free-run lead-in mode or speed search mode. Select the b contact input for the inverter
“External BB” input.
6.3 Voltage Selection Jumper Settings (Tap Change PCB)
The power voltage selection jumper must be selected according to the main supply voltage
level. Insert the connector at the position corresponding to the supply voltage used. The
jumper is located on the tap change PCB (ETX00333X).
Pout (kW)
1
η INV η M ×
-------------------------- P MI
… P
MN + +
( ) η INV –
η M P
MI '
… P
MN ' + +
( ) × ≥
{ {
Power Regen
P
OUT
: Converter Rated Output (kW)
P
MI
~P
MN
’ : Motor Output (kW)
η
M : Motor Efficiency 0.9 (Typical)
η
INV : Inverter Efficiency 0.95 (Typical)