Yaskawa DSD 406 - Manual (Page 24)

2 Installation and Start-Up
20 Using of An Analog Tachometer
3/21/96
❏ Inspect all equipment for signs of damage, loose connections, or other
related problem areas.
❏ Ensure the three phase line voltage is within +10% of the nominal input
voltage range of 230/460 VAC. Also verify that frequency is correct for the
drive system. Note that the drive is not sensitive to phase sequence. Input
power specifications are contained on the drive nameplate or the drive
system Schematic Diagram.
❏ Remove all shipping devices and relay wedges. Manually operate all
contactors and relays to ensure that they move freely.
Pre-Power
Check
CAUTION
To prevent damage to the drive, the following checks must be
performed before applying the input power.
IMPORTANT
In order to produce output to a motor, the power cube may also
need input and output signal connections for Local I/O. See
Schematic and/or Interconnection Diagrams for specific
connections.
The DSD 406 / 412 has provisions for an analog tachometer input at TB1
terminals 22 and 23. Either a DC or AC tachometer may be used as selected in
the PAC program. The hardware circuitry is designed for 75-120 volts DC or
50-85 volts AC of nominal input at rated top speed. For best performance, it is
recommended that a 50 volts per 1,000 rpm DC tachometer be used with 1750 or
2300 rpm motors.
If higher tachometer voltages are required, add an external resistor in series with
the tachometer wiring signal at terminal 23. Use 107 Kohms (±1%, 1/2 watt) for
each additional 100 volts expected signal. [ For example, add a 107 Kohm, 1%,
1/2 watt resistor in series with the tachometer wire at terminal 23 if a 100 volts
per 1,000 rpm DC tach is used with 1750 or 2300 rpm motors. ]
Use of An
Analog
Tachometer
CAUTION
The analog tachometer input channel may saturate if input
voltages exceed 150 volts DC or 106 volts AC at terminal 23.
This may cause loss of drive control and a drive speed run-
away or component damage.