ABB PRO-33.0-TL Series, Service Manual

Page: 19 / 122

Program features 19
Grid monitoring
The PRO-33.0-TL inverter monitors the grid conditions with internal measurements. The
measured values are compared against the limits set in the parameter group
188 Grid
monitoring . If the measured value does not stay within the limit for a certain minimum
period of time, the inverter declares the grid as unstable. All grid monitoring settings are
reset when the country code is changed.
Notes :
•
If the grid monitoring settings are changed, do a parameter refresh with the parameter
188.05 Refresh .
•
Depending on the installation country, an external third party-certified grid monitoring
relay may be needed.

Nominal values
Note : The fault ride-through settings must be taken into account when defining grid
monitoring.
The inverter monitors either line-to-line voltages or line-to-neutral voltages. This is
selected with the parameter
188.06 Voltage source that can be set to Main or Phase ,
respectively. The settings for grid monitoring are set in relation to the nominal value.
Settings
188.02 Nominal LL voltage
188.03 Nominal phase voltage
188.04 Nominal frequency
188.06 Voltage source

Connection delays
Typically, it is required that the grid must be stable for some time before grid connection is
allowed. For this purpose there is a set of delays.
•
188.10 Initial connection delay defines the delay that must expire before the first grid
connection after a power-up can be made.
•
188.11 Reconnection delay defines the delay that must expire after a disconnection
before the following reconnection.
•
188.13 Quick reconnection delay is used if the grid is unstable for less than the value
defined in parameter 188.12 Quick disturbance limit . Thus a short unstable grid allows
a faster reconnection. If the parameter 188.12 Quick disturbance limit is set to 0 , quick
reconnection is not used.
Settings
188.10 Initial connection delay
188.11 Reconnection delay
188.12 Quick disturbance limit
188.13 Quick reconnection delay