Fagor DDS Series Hardware Manual page 284

   Installation
8.
310
DDS
HARDWARE
Ref.1912
· 284 ·
Ohm values
WARNING. The Ohm value of the external Ballast resistor must be the same
as that of the internal resistor of that module.
See the tables in section " RESISTOR MODULES " of chapter 4 that show
the compact drives and the possible external Ballast resistors associated
with them.
MANDATORY. On all compact drives (except those whose model is SCD-
NR x.xx), the external resistor supplied with the units. ACD/SCD/CMC 1.08
/1.15 models are also an exception.
On compact drives "ACD/SCD/CMC 1.08/1.15", as opposed to the rest of the
compact models, do not install any external Ballast resistor. The internal one
is enough, except on "SCD 1.15" models where it would be possible to install
the internal resistor ER+TH-43/350 if the application so required.
In general, on compact models "ACD/CMC 1.08/1.15" the internal dissipation
Ballast resistor will be enough, but if it is not in a particular situation, it is
possible to install an external resistor of the same Ohm value as the internal
one and greater dissipation power.
NOTE. Actually, the external resistor provided with the unit is considered
enough for most applications. If it is not enough, install one of the same
Ohm value and greater power.
On any compact drive whose model is SCD-...-NR x.xx no external Ballast
resistor will supplied with the unit. The user will place the order for the
external resistor required by the application with a FAGOR representative.
Remember that it must have the same Ohm value as the internal resistor of
the module.
Ballast resistor connection to the bus protection module,
BPM
Up to 3 resistors ER+TH-18/1100 may be connected in parallel to a BPM
module (depending on the requirements of the application) through the
screw-in type 6-pin (2 per resistor) plug-in connector located at the bottom of
the bus protection module, BPM.
This way, pins (R1-R1, R2-R2 and R3-R3) of the BPM module are used to
connect one, two or three (at most) external resistors ER+TH-18/1100 in
parallel.
WARNING. On top of the ER+TH modules, the air temperature can reach
values over 120°C/248°F. Therefore, the resistor should be mounted away
from the rest of the modules or even outside the electrical cabinet, always
vertically and away from cables and other temperature sensitive material.
WARNING. Never connect resistors other than ER+TH-18/1100. Ignoring this
warning may cause severe damage to the unit.
Chapter 4. AUXILIARY MODULES of this manual describes the technical
characteristics of the resistor ER+TH-18/1100 and of the external thermostat.
Their dimensions are shown in chapter 11. DIMENSIONS .