9.3.3.12
Stub protection STBPTOC
Main menu/Settings/Setting Group N/Current protection/Stub(PTOC,50STB)/
STB
Displays instances of STBPTOC with some settings per instance. These are
operation, base current settings, release mode, operate current level and time delay.
9.3.3.13
Thermal overload protection, one time constant LPTTR
Main menu/Settings/Setting Group N/Current protection/
ThermalOverload1TimeConst(PTTR,26)/THL
Displays available instances of LPTTR with a number of settings per instance.
Typical settings are the hysteresis for start temperature, pulse length for operate
output, ambient temperature settings and so forth.
9.3.3.14
Thermal overload protection, two time constants TRPTTR
Main menu/Settings/Setting Group N/Current protection/
ThermalOverload2TimeConst(PTTR,49)/TTR
Displays some instances of TRPTTR with several settable parameters per instance.
Typical settings are length of pulse for trip signal, reference current as a percentage
of the base system current and several other related settings.
9.3.4
Voltage protection
9.3.4.1
Overview
For Voltage protection there are settings for Under-voltage, Over-voltage, Residual
over-voltage and Overexcitation protection. There are three instances of parameters
in each category except in the case of Overexcitation which has two instances.
Each instance consists of a number of parameters that make it possible to switch
the function On or Off, set rated quantities or make other adjustments necessary for
the fine tuning of the function itself.
9.3.4.2
Loss of voltage check LOVPTUV
Main menu/Setting/Setting Group N/Voltage protection/LossOfVoltage(PTUV,
27)/LOV
Parameters for voltages and timers are set here.
9.3.4.3
Two step overvoltage protection OV2PTOV
Main menu/Settings/Setting Group N/Voltage protection/
OverVoltage2Step(PTOV,59)/TOV
Section 9
1MRK 511 188-UEN C
Read and change settings
56
Operator's manual
