Auxiliary modules
AUXILIARY MODULES
External Ballast resistors
4.
193
DDS
HARDWARE
Ref.1310
4.3 External Ballast resistors
External resistors are used to dissipate the excess of energy generated at
the power bus in a braking process of electrical motors and cannot be
dissipated by the internal resistor of the module (power supply or compact
drive). These resistors do not require external electrical supply.
ER+TH-x/x resistors with thermostat. Technical data
Independent resistors whose reference is ER+TH-/ are external elec-
trical resistors used with power supplies and compact drives that have an
internal or external thermostat.
NOTE. This manual uses two synonyms “external Ballast resistors” and
“Crowbar resistors” to refer to external braking resistors.
F. H4/4
External Ballast resistors:
A. with external thermostat, B. with internal thermostat.
T. H4/5 External Ballast resistor with external thermostat. Technical data.
With external
thermostat
ER+TH
-24/750
ER+TH
-24/1100
ER+TH
-18/1100
Resistor 24 24 18
Tolerance ± 5% ± 5% ± 5%
RMS power 650 W 950 W 950 W
Energy absorbed in
5" overloaded
37 kJ 55 kJ 55 kJ
Operating ambient
temperature
5 °C to 45 °C (41 °F to 113 °F)
Storage temperature - 20 °C to 60 °C (- 4 °F to 140 °F)
Relative humidity < 90 % non condensing at 45 °C (113 °F)
Operating vibration 0.5 G
Shipping vibration 2 G
Sealing degree IP 55
Approx. mass gr / lb 920 / 2.02 1250 / 2.75 1250 / 2.75
Note that the value for the rms power depends on the following condi-
tions: Resistor installed vertically with the connection cables at the bot-
tom and separated from the nearest surface at a distance of at least 10
cm (about 4 inches).
WARNING. Careful with the surface of these resistors. Remember that its
temperature may reach 400 °C (752 °F).
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