Advanced Energy THYRO-AX, Руководство пользователя

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9. LOAD MONITORING
Load monitoring is the identification of a breakdown of one or more
resistors connected in parallel series at the time of an error. Therefore
the values of load resistance characteristic have to be in the device.
Those values are set or automatically determined regarding one of the
following approaches:
1. Automatic measurement of nonlinear load characteristic with
TeachIn feature
Via TeachIn feature (menu item TeachIn in main menu) the nonlinear load
characteristic will be measured automatically.
NOTE:
During TeachIn feature, the unit will be processed for approx. 20s with
power on to the connected load within the set limits for current, voltage
and power (I_Max, U_Max and P_Max) at default setting.
Thereby the upper and lower tolerance limit of load characteristic (Rmin
and Rmax) are determined and saved each for 10 zones.
The parameter RAutoTol (default setting: 10%) determines the tolerance
requirement during TeachIn feature, the parameter is changeable with
Thyro-Tool AX.
Through TeachIn feature the load monitoring is active.
2. Manual entry or change of nonlinear load characteristic with
Thyro-Tool AX
With Thyro-Tool AX, the 10 values can be set and changed manually in
menu LOAD CHARACTERISTIC for the upper and lower tolerance limits
of load characteristic (R
max
and R
min
).
Furthermore the load monitoring can be activated or deactivated sepa-
rately for the upper and lower tolerance limit (R
max
, R
min
) in menu
MONITORING of Thyro-Tool AX.
3. Manual entry of linear load resistor value via display
By using menu items SETTINGS -> MONITORING on the display, the
linear load resistor value R_Max can be entered manually.
R_Max shows at active load monitoring the arithmetic mean of 10 values
of the resistor characteristics.
At deactivate load monitoring, the value for R_Max is 0.
If R_Max is set (by pressing OK) to a value > 0 on the display, the appli-
cable existing nonlinear load resistor characteristic will be exchanged by
the defined linear resistor of R_Max and load monitoring will be active.
If R_Max is set to 0 on the display, the load monitoring will be deactiva-
ted.
Alternatively the TeachIn-function can be used for an automatically
adjustment of the parameter R_Max. TeachIn determines the value for
R_Max by measuring the current and voltage plus a variable addition
(parameter RAutoTol, default value: 10%, parameter RAutoTol can be
changed with Thyro-Tool AX). While TeachIn determines the value for
R_Max, the limits are still in use (I_Max, U_Max and P_Max).
NOTE
- Thyro-Tool AX can reactivate the load monitoring together with the
(nonlinear) load characteristic of the device.
- The adjusted monitoring value Rmax should be in the middle between
the resistance value without error and the resistance value at an error.
However, it should not fall below 15%.
- In the tables below attention should be paid to minimal load nominal
current (I-load-nominal / I-type controller) and minimal load nominal
voltage (U-load-nominal / U-type controller). If the values are by far
better as the ones in the tables, a better monitoring could be achie-
ved by more parallel load resistances.
Thyro-AX 1A, Thyro-AX 2A and Thyro-AX 3A (load with separate star
point without neutral conductor)
NUMBER OF
PARALLEL
LOAD RESIS-
TANCES I
LOAD NOMINAL
/
I
TYPE CONTROLLER
*
U
LOAD NOMINAL
/
U
TYPE CONTROLLER
*
RESISTANCE
CHANGE IN
FAULT** RECOM-
MENDED
SETTINGS
FOR R_MAX
1 20% 40% unlimited R
Load
+50%
2 20% 40% +100% R
Load
+50%
3 40% 40% +50% R
Load
+25%
4 40% 40% +33% R
Load
+18%
5 40% 40% +25% R
Load
+15%