Analog Speed Reference - YASKAWA VS-626M5 Instruction Manual

4.2 Analog Speed Reference

This section proves detailed information on the analog speed reference signal for stand-alone drives M5A.
SCOM (Analog Speed Reference Input)
J
Connector number: 6CN
Pin number: 3
The rated input voltage is ±10 VDC. Set the motor speed at the rated input voltage (i.e., a 100% speed
D
reference) in C1-26 (S100), the rated speed setting constant.
If the motor speed at the rated input voltage does not reach the maximum speed, adjust the motor speed
D
in C1-12 (S
The maximum permissible input voltage is ±12 VDC. The voltage is, however, limited to a maximum
D
of 105% or 110% reference in the Controller. Therefore, the speed of the motor will reach 105% or
110% of the rated speed. The speed limit level is selected with bit 5 of selection signal C1-38 (SEL3).
The level is set to 105% when bit 5 is turned OFF and 110% when bit 5 is turned ON.
The SCOM signal has an input impedance of 50 kΩ.
D
The speed together with the rotating direction is determined by the SCOM signal and operation signal
D
as shown below.
Operation signal
The SCOM signal will be enabled and the motor will rotate when the FWD or REV signal is turned
D
ON.
The motor may not come to a stop with the SCOM signal set to 0 V while the FWD or REV signal is
D
being input. To stop the motor, turn OFF both the FWD and REV signals. The motor current will flow
while the FWD or REV signal is ON.
Use a shielded cable to wire the SCROM signal to improve noise immunity.
D
The SCOM signal can be manually set to the reference voltage (+15 V) of the Controller provided that
D
the current flow is 10 mA or less.
), the motor speed adjustment constant.
ADJ
105%
Rated speed
[REV]
−10.5V
−12 V
0
[FWD] [REV]
105%
Reverse
Speed Reference
[FWD]
[REV]
3
Setting resistor
2
2 kΩ
1 W min.
1
4 -9
105%
Forward
[FWD]
10.5 V
[SCOM]
12 V
105%
+
CCW (Forward)
CW (Reverse)
VS−626M5
6CN
1
+15 V
3
[SCOM]
4
0 V
4.2 Analog Speed Reference
−
CW (Reverse)
CCW (Forward)
4