Inspection Of Cable Connection; Input Power Source Specifications - Okuma VTM-200 Operation & Maintenance Manual

4-1.

Inspection of Cable Connection

Connect the power wire in the correct phase order.
The hydraulic pressure will rise to the setting value (6.0 MPa [870.61 psi]) with the correct phase
order.
CAUTION
1) Connect the ground wire to the external protective earth terminal (PE) in the control
box.
2) Do not connect the power cord and the grounding wire in serial; if attempted, it will give
adverse affect to other equipment or cause malfunctioning of the leak breaker, etc.
3) When a leak breaker is used, select the one meeting the following rating.
•
For inverter circuit use
•
Sensitive current of 100 mA or more
•
Middle-sensitivity high-speed inverter type
4) Check that the momentary voltage variation rate is 15% or less as shown in 6-3. Mea-
suring the Momentary Voltage Fluctuation Ratio.
If the momentary voltage variation rate exceeds 15%, the acceleration/deceleration time
of the spindle may be lengthened or the protection circuit of the servo power unit may
be activated.
5) For further information on instantaneous power regulation and power source induc-
tance, please inquire at your Okuma representative.
6) To furnish the power supply line in the machine, pull the cable under the control cabi-
net where is advantageous for the dust and water prevention. Apply the protection
against dust and water to the cable. The protection measurement is required also when
pulled over the cabinet.
In addition, hold the power supply cable appropriately so that the tension wire will not
hang on to the connection part of the main breaker of the power supply line.
4-2.

Input Power Source Specifications

If the nominal rated voltage is other than 200 V, use a transformer to convert it to 200 V.
- Nominal rated voltage
- Allowable voltage range
- Frequency
- Allowable frequency range : 49 to 61 Hz
- Power source inductance
CAUTION
A large inductance of power source will cause acceleration/deceleration time of the spin-
dle to be elongated. In addition, it may cause the protective circuit of the DC power supply
unit to operate.
Output rating is guaranteed in the operation under nominal voltage rating. If input voltage
varies, output rating may not be obtained even if the voltage is within the permissible
range.
SECTION 2 TRANSPORTATION AND INSTALLATION
: 200 V
: 180 to 220 Vrms (Includes voltage fluctuation caused by load)
: 50/60 Hz
: Coefficient of momentary voltage fluctuation at the maximum
output shall be within 15%. (Voltage fluctuation must be within
the allowable range of the voltmeter.)
5699-E P-8