Woodward 2301E, Инструкция по установке и эксплуатации, Страница: 132 / 182

2301E Digital Control Manual 26641
122 Woodward
The Phase Correction Procedure requires that the prime mover be shut down
many times to disconnect the current transformers or short the current
transformers. Figure 5-1 is a typical recommended connections for current
transformers.
HIGH VOLTAGE
—The current transformers can develop dangerously
high voltages. Do not disconnect a current transformer while the
prime mover is running unless temporary 0.5 A, 20 W resistors are
installed as shown in Figure 5-1, and all load is removed.
Figure 5-1. Temporary Wiring for Transformer Phase Correction
If the shorting terminal block is not used, the prime mover MUST be shut down in
addition to removing the load in the following procedure.
Monitor the load sensor output in this procedure by connecting an external
computer and entering the Control Assistant menu
T**KW INPUT
CALIBRATION** or the 2301E Toolkit Service Tool. Observe 03 Gen Output
(READ KW) Load Sensor calibration and monitoring. Since the kW calibration
cannot be completed until the phasing is correct, the value shown is for reference
only. The Load Sensor of the 2301E will only read a small negative value.
1. Shut down the prime mover.
HIGH VOLTAGE
— The current transformers can develop
dangerously high voltages. Do not disconnect a current transformer
while the current is flowing through it, unless a temporary short is
installed across the current transformers.
2. Label each CT wire with the phase and polarity that you think it should be.
Even though this identification may prove to be incorrect, this step is
necessary so that the individual wires can be identified during the description
of the procedure.
3. Using the Shorting Terminal block, screw in the screw that shorts the phase
B phase CT wires from terminals 6 and 7. Remove the wires on terminals 6
and 7 on the 2301E.
4. Using the Shorting Terminal block, screw in the screw that shorts the phase
C phase CT wires from terminals 8 and 9. Remove the wires on terminals 8
and 9 on the 2301E.