
6
To be able to measure analog signals the control
module requires an optional module.
The functions of the three optional modules
available are as follows:
Module
Function
Measuring module SPTM 8A1
Rectifies three phase currents and three phase-to-phase
(optional module 1)
voltages.
Forms voltage signals of external mA-input signals.
Measuring module SPTM 6A2
Rectifies three phase currents and three phase-to-phase
(optional module 2)
voltages.
Forms using internal current and voltage signals the signals
corresponding to active and reactive power.
(Aron connection).
Measuring module SPTM 6A3
Rectifies three phase currents and three phase-to-phase
(optional module 3)
voltages.
Forms using one internal voltage signal and two current signals
the signals corresponding to active and reactive power.
The phase overcurrent relay module SPCJ 3C3
and the directional neutral overcurrent relay
module SPCS 3C4 are withdrawable Euro-size
(100 x 160 mm) modules.
The control module type SPTO 6D3, too, is
designed as a plug-in unit. This module includes
two PC boards: a CPU board and a front PC
board which are mechanically connected to
each other. The three I/O modules SPTR 4D_
and the optional measuring module are located
behind the module’s front PC board. The I/O
modules and the optional measuring modules
can be withdrawn after the control module has
been removed.
The input and output signals of the I/O module
U7 (SPTR 4D_) are all linked via the multi-pole
connector X3. In the same way the signals of I/O
module U8 are linked via multi-pole connector
X4 and the signals of I/O module U9 via multi-
pole connector X5.
In SPAC 531 C the power supply module
SPGU 240A1 or SPGU 48B2 and the I/O
module SPTR 6B11 are located behind the
system front panel. The modules can be with-
drawn after removal of the system panel.
In SPAC 631 C the power supply module
SPGU 240A1 or SPGU 48B2 is located behind
the leftmost front plate of the lower level of the
subrack. The I/O module SPTR 6B11 is located
behind the system front panel. The modules are
withdrawable.
The relay modules SPCJ 3C3 and SPCS 3C4 are
fastened to the case with two finger screws and
the control module SPTO 6D3 with four finger
screws. These modules can be pulled out of the
subrack after the finger screws have been loos-
ened.
Note !
Before a module is withdrawn from or inserted
into the subrack the auxiliary supply must be
switched off.