Auxiliary modules
4.
AUXILIARY MODULES
External Ballast resistors
200
Ref.1912
DDS
HARDWARE
· 186 ·
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.
Outside look
Independent resistors whose model is ER+TH-/ are external electrical
resistors used with power supplies and compact drives that have an internal
or external thermostat.
Technical data
NOTE. This manual uses two synonyms “EXTERNAL BALLAST
RESISTORS” and “CROWBAR RESISTORS” to refer to external braking
resistors.
ER+TH-
/
resistors with thermostat
F. H4/4
External Ballast resistors. Outside look.
A. with external thermostat, B. with internal thermostat.
T. H4/6 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 5°C/45°C (41°F/113°F)
Storage temperature -20°C/60°C (-4°F/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 1 250/2.75 1 250/2.75
Note that the value for the rms power depends on the following conditions: Resistor
installed vertically with the connection cables at the bottom and separated from the
nearest surface at a distance of at least 10 cm (about 4 in).
A
ER+TH-24/750
ER+TH-24/1100
ER+TH-18/1100
ER+TH-18/1800
ER+TH-18/2200
B
WARNING. HEAT DANGER. DO NOT TOUCH the surface of these
resistors. Remember that it may reach temperatures around 400°C/752°F.
If it is installed to be easily accessible, precautions must be taken to prevent
unintentional contact. Also avoid heat sensitive items (cables, etc.) from
coming into contact with the surface to avoid damaging or destroying these
elements and/or causing other more dangerous situations.
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