Fagor DDS Series Hardware Manual page 186

  Auxiliary modules
4.3 External Ballast resistors
4.
200
DDS
HARDWARE
Ref.1912
· 186 ·
NOTE. This manual uses two synonyms "EXTERNAL BALLAST
RESISTORS" and "CROWBAR RESISTORS" to refer to external braking
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-/ resistors with thermostat
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.
A
ER+TH-24/750
ER+TH-24/1100
ER+TH-18/1100
F. H4/4
External Ballast resistors. Outside look.
A. with external thermostat, B. with internal thermostat.
Technical data
T. H4/6 External Ballast resistor with external thermostat. Technical data.
With external
thermostat
Resistor
Tolerance
RMS power
Energy absorbed in 5"
overloaded
Operating ambient
Storage temperature
Relative humidity
Operating vibration
Shipping vibration
Sealing degree
Approx. mass gr/lb
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).
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.
B
ER+TH-18/1800
ER+TH-18/2200
ER+TH- ER+TH-
24/750 24/1100
24  24 
± 5 % ± 5 %
650 W 950 W
37 kJ 55 kJ
5°C/45°C (41°F/113°F)
-20°C/60°C (-4°F/140°F)
< 90 % non condensing at 45°C/113°F
0.5 g
2 g
IP 55
920/2.02 1 250/2.75
ER+TH-
18/1100
18 
± 5 %
950 W
55 kJ
1 250/2.75