Manta MTS-1700 SERIES, Руководство по эксплуатации и справочник

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RS-232C INTERFACE - Section 6
6-14 MTS-1700 SERIES OPERATION AND REFERENCE MANUAL
MANTA TEST SYSTEMS
CU A002 15A
6.2.7 Phase Control
These phase commands set the phase angle between the monitored voltage and current (Except in I1&I2
current mode, the phase between I1 and I2 is changed). Note these quantities change depending upon the
current mode and fault mode.
For everyday users, the MTS-1710 simplifies phase angle settings down to the phase angle of primary
interest. When the MTS-1710 is turned on, the phase angle setting is set to zero. In most cases, the PHS#,
PFI#, PFF#, and PPO# commands will intelligently set the phase angle to the desired value between the
voltage and current of interest (as selected by the fault mode).
However, in special cases, such as a
Φ
-
Φ
fault with unbalanced prefault voltages, there will be a constant
difference between the setting specified and the actual phase angle (as measured by the MTS-1710). The
PRP command is provided to allow resetting of the internal reference. This is similar to the tare concept on
a scale.
In general, if the phase setting isn’t acting as expected, send the PRP command while current and voltage
are on, and a valid phase reading is displayed. Then resend all the PHS#, PFI#, PFF# and PPO# settings.
This should correct the phase setting to the desired values.
6.2.7.1 COMMANDS.
Command Description
PRP Preset Phase
•
Presets the internal phase reference to the presently monitored voltage.
•
This command should be sent each time the fault mode or current mode is
changed.
•
Current must be flowing, and a valid phase reading present, before this
command is sent.
PHS# Prefault Phase
•
Sets the prefault phase angle
•
Valid values are -360.0 to 360.0 (degrees)
•
Note that changing the value of the prefault phase changes the absolute value of
the fault initial, fault final, and postfault phase settings. The relative values
between fault initial and prefault, fault final and prefault, and postfault and
prefault, stay unchanged.
As a result, it may be necessary to reprogram the fault initial, fault final and
postfault phase using the PFI, PFF and PPO commands if the prefault phase is
changed.
•
Note that for I1-LOW, I1-HIGH, I3, I3-PARALLEL, I3-WYE, I1-LOW-AUX,
I1-HIGH-AUX and I3-AUX current mode, the value for the setting is always
the number of degrees by which the voltage leads the current (The phase display
mode may be set differently and read a different value).