4.2 Analog Speed Reference
4
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4.2 Analog Speed Reference
This section proves detailed information on the analog speed reference signal for stand-alone drives M5A.
J
SCOM (Analog Speed Reference Input)
Connector number: 6CN
Pin number: 3
D
The rated input voltage is
±
10 VDC. Set the motor speed at the rated input voltage (i.e., a 100% speed
reference) in C1-26 (S100), the rated speed setting constant.
D
If the motor speed at the rated input voltage does not reach the maximum speed, adjust the motor speed
in C1-12 (S
ADJ
), the motor speed adjustment constant.
D
The maximum permissible input voltage is
±
12 VDC. The voltage is, however, limited to a maximum
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.
D
The SCOM signal has an input impedance of 50 k
Ω
.
D
The speed together with the rotating direction is determined by the SCOM signal and operation signal
as shown below.
Rated speed
Forward
Reverse
105%
105%
[SCOM]
[FWD] [REV]
[FWD]
[REV]
−
10.5V
−
12 V
12 V
10.5 V
105%
105%
0
Speed Reference
+
−
Operation signal
[FWD]
CCW (Forward)
CW (Reverse)
[REV]
CW (Reverse)
CCW (Forward)
D
The SCOM signal will be enabled and the motor will rotate when the FWD or REV signal is turned
ON.
D
The motor may not come to a stop with the SCOM signal set to 0 V while the FWD or REV signal is
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.
D
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
the current flow is 10 mA or less.
Setting resistor
2 k
Ω
1 W min.
3
2
1
VS
−
626M5
3
4
1
+15 V
0 V
[SCOM]
6CN
4
Summary of Contents for CIMR-M5 Series
Page 12: ...Notes for Motor xi...
