SMA SC 4000 UP, Service Manual

4  Power-Generating Unit Protection Test

SMA Solar Technology AG

Service Manual for Installers

15

SC-UP_SCS-UP_EZE-SG-en-10

Formula Symbol

Unit

Explanation

TrfVolExHi**

V

Voltage on the high-voltage side of the external transformer (parame-
ter)

* This parameter takes the level of the medium voltage into account. For

VolRtg

, the voltage at the grid feed-in point as contractually agreed

with the grid operator, must be entered for 

VRtg

.

** These parameters take the transformation ratio of the tap changer of the medium-voltage transformer into account. During commissioning,

the tap changer is adjusted in such way that the terminal voltage of the medium-voltage transformer matches the nominal voltage of the
inverter as closely as possible.

4.3

Saving the Test Parameters

The inverters have 6 relevant parameter pairs each for voltage increase protection and voltage drop protection and 1
relevant pair of parameters for frequency increase protection and frequency drop protection.

Test parameters

Set value / disconnection time

Voltage increase protection

1st level: V> / t

V>

VCtl.Hi1Lim / VCtl.Hi1LimTm

2nd level: V>> / t

V>>

VCtl.Hi2Lim / VCtl.Hi2LimTm

3rd level: V>>> / t

V>>>

VCtl.Hi3Lim / VCtl.Hi3LimTm

4th level: V>>>> / t

V>>>>

VCtl.Hi4Lim / VCtl.Hi4LimTm

5th level: V>>>>> / t

V>>>>

VCtl.Hi5Lim / VCtl.Hi5LimTm

6th level: V>>>>> / t

V>>>>

VCtl.Hi6Lim / VCtl.Hi6LimTm

Voltage drop protection

1st level: V< / t

V<

VCtl.Lo1Lim / VCtl.Lo1LimTm

2nd level: V<< / t

V<<

VCtl.Lo2Lim / VCtl.Lo2LimTm

3rd level: V<<< / t

V<<<

VCtl.Lo3Lim / VCtl.Lo3LimTm

4th level: V<<<< / t

V<<<<

VCtl.Lo4Lim / VCtl.Lo4LimTm

5th level: V<<<<< / t

V<<<<<

VCtl.Lo5Lim / VCtl.Lo5LimTm

6th level: V<<<<< / t

V<<<<<

VCtl.Lo6Lim / VCtl.Lo6LimTm

Frequency increase protection

1st level: f> / t

V>

HzCtl.Hi1Lim / HzCtl.Hi1LimTm

Frequency drop protection

1st level: f< / t

V<

HzCtl.Lo1Lim / HzCtl.Lo1LimTm

Access to parameters

The parameters needed for the power-generating unit protection test are only accessible after the installer
password has been entered. The installer password is changed during the initial installation. You can obtain the
changed installer password from the PV system operator.

Procedure:

1. Log into the user interface as an 

Installer

.

2. In the main navigation, select   and select 

Parameter

 from the drop-down list.

3. Save the test parameter values.