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Doc N°
Mod.
Apparatus
Scale
Page No
1SDH000587R0002
3.10.1.4. Dielectric strength tests
To perform the dielectric tests, it is obligatory to disconnect Measuring module PR330/V, as described below and in document
1SDH001193R0001.
If dielectric tests are performed on the auxiliary circuits of the circuit-breaker:
1. If the circuit-breaker is the withdrawable type, it must be brought to the withdrawn position.
2. If the circuit-breaker is the fixed type, disconnect the circuits in the terminal box.
If dielectric tests are performed on the main circuits:
1. In the case of a fixed circuit-breaker and module PR330/V with external voltage taps, remove the voltage taps of the module
(T1,T2,T3,T4) from the terminal box. In the case of module PR330/V with internal voltage taps, follow sequence A-B-C-D-E and
comply with the instructions in document 1SDH001193R0001, i.e. remove the escutcheon plate from the circuit-breaker, con-
nector 1 and connector 2 for the internal voltage taps.
If the external neutral is present, also remove the relative connection T1 in the terminal box
2. If the circuit-breaker is the withdrawable type, it must be brought to the withdrawn position.
NOTE: check the relative S/N to find out whether a measuring module has internal or external voltage taps: if the last letter is A
or B, the module has external voltage taps. If the last letter is C or D, the module has internal voltage taps.
3.10.2. Module PR330/D-M - COM
Power led
Communication
led
Communication module PR330/D-M is dedicated to connecting the protection
release to a Modbus network for remote supervisory and control activities for the
circuit-breakers.
The module also allows you to:
- Read certain states of the CB, with reference to the springs and to the position
if the CB is withdrawable.
- There are contacts for managing CB opening and closing commands by means
coils YO and YC.
The module functions with Vaux present.
The module has a “Power” led, which indicates that it is on, and two “Tx“ and
“Rx“ communication led to indicate data reception/transmission.
The menu in the protection release allows various different parameters to be
adjusted:
- Protection release configuration (local/remote)
- Communication parameters (baudrate, address, parity)
The communication function with PR330/D-M - COM responds to the Modbus RTU protocol, using a physical interface of the
RS485 type.
All the information required for correct management of the communication with PR330/D-M is given in the Modbus System In-
terface for PR122-3 and PR332-3 (1SDH000556R0001).
3.10.2.1. PR330/D-M parameters
All the communication parameters can be adjusted in the Settings-Modules menu.
Parameter
Values
Notes
Local/remote
Local/remote
Local: all changes to the parameters must be made via the menu in the
protection release. Only supervision is allowed in the remote mode.
Remote: all changes to the parameters must be made in the remote
mode. Only supervision and modification of the Local/Remote parameter
can be performed via the menu in the protection release.
Serial address
1...247; step 1
To avoid conflict in a communication network, it is important to ensure
that the unit is not configured with the same address.
Baudrate
9600 / 19200bit/s
Physical protocol 8,E,1 - 8,0,1 - 8,N,2 - 8,N,1
Addressing
Modbus standard ABB
The parameters can also be edited by means of the PR010/T, BT030-USB and Ekip T&P units.
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