ABB RELION 620 Series Technical Manual page 318

Section 4
Protection functions
312
GUID-D9822D90-528D-418D-8422-25F5D2A4637B V1 EN
Figure 157: Effective start value or voltage slope characteristic
To achieve the voltage slope characteristics, Voltage high limit must
always be set to a value greater than Voltage low limit.
If Voltage high limit is lower than Voltage low limit, the voltage step
characteristic is active with Voltage low limit being the cutoff value.
The value of the setting Start value should always be greater than the
setting Start value low. Otherwise, Start value low is used as the
effective start value.
External input control mode
The External input control mode is used to enable voltage control from an external
application. If Control mode is set to the "Input Control" mode, the effective start
value for all phases is influenced by the status of the binary input ENA_U_MULT.
If ENA U MULT isTRUE
_ _
Effective start value Start value low
=
GUID-CDFA5EFC-64BA-4E12-8A08-67356410C452 V1 EN
If ENA U MULT is FALSE _ _
Effective start value Start value
=
GUID-496C64F4-80A6-4CC9-AB67-A1F89B62379C V1 EN
:
:
1MRS757644 F
(Equation 8)
(Equation 9)
620 series
Technical Manual