HP series: Dynamic braking resistors, enclosed to IP20, offering virtually no audible noise when subject to inverter braking currents.
Low inductance open wound element construction allows high power dissipation in a small space.
APPLICATIONS
Dynamic braking
Motor control
Variable speed drives
Lifts & elevators
Cranes & winches
Conveyors
Test loads
ORDERING INFORMATION
Resistor part numbering
HP1 - Enclosure Style
HP1 =
1.5kW
HP2 =
3.0kW
HP3 =
4.5kW
3R9 - Resisitance Value
3R9 =
3.9
22R =
22
68R =
68
4R7 =
4.7
24R =
24
75R =
75
5R6 =
5.6
27R =
27
82R =
82
6R8 =
6.8
30R =
30
100R =
100
8R2 =
8.2
33R =
33
120R =
120
10R =
10
39R =
39
150R =
150
12R =
12
40R =
40
180R =
180
15R =
15
47R =
47
18R =
18
50R =
50
20R =
20
56R =
56
ELECTRICAL AND THERMAL DATA
Resistance and Power
Resistance/
Tolerance +10/-0%
Enclosure style
HP1
HP2
HP3
Maximum Continuous
Power/kW
1.5
3.0
4.5
3.9
x
4.7, 5.6, 6.8, 8.2
x
x
10, 12, 15, 18, 20, 22, 24, 27, 30, 33
x
x
x
39, 40, 47, 50, 56, 68, 75, 82, 100
x
x
x
120
x
x
150, 180
x
Duty Cycle and Power
HP1, HP2 and HP3 have continuous power ratings of 1.5kW, 3.0kW and 4.5kW respectively. Continuous power ratings can be exceeded when power is applied for less than 100% of the time. The graph below gives “duty cycle” based on a 10 second on time against “power multiplier”. Multiply the resistor’s continuous power rating by the “power multiplier” number to calculate power. In the case of HP1 resistors only, with resistance values of 100O or more, a de-rating factor of 0.8 needs to be applied.
Example: 10 seconds on in 100 seconds is defined as a 10% duty cycle. A 10% duty cycle gives a 4.6 times power multiplier. HP1 resistors are rated 1.5kW continuously and can be rated 6.9kW (4.6 x 1.5kW) for 10 seconds in 100 seconds. If the resistors have a resistance of 100O or more, then the power rating is reduced to 5.5kW (6.9kW x 0.8).
Resistance and Element Temperature
Hi-Power resistors are manufactured using high grade Nickel Chrome wire. The resistance value of this changes little over the temperature range of the element. Cheaper designs using 304 stainless steel can increase in resistance by as much as 50% resulting in less effective braking.
Maximum Operating Voltage
1000V DC or AC rms
Thermal Sensor
Normally closed contact, opens at ~250°C, re-closes at ~210°C
Voltage: 240V AC rms
Current: 7A AC rms
Enhanced repetitive and single shot duty cycle power ratings
Robust construction giving negligible audible noise
Low inductance stable resistance element
Thermal sensor
20mm knockouts for cable entry
IP20 housing with easy access to screw terminals and earth stud
Range of optional accessories
ACCESSORIES
HP - PC1
3m long, 2.5mm2, ferrule terminated, 3-core screened power cable kit, including clamping gland. (Cable not installed).
HP - TC1
3m long, 1mm2, ferrule terminated, 2-core screened cable kit for thermal sensor, including clamping gland. (Cable not installed).
HP1 - C1
IP21 drip proof canopy for horizontally mounted HP1 DBR unit. (Canopy not installed).
HP2 - C1
IP21 drip proof canopy for horizontally mounted HP2 DBR unit. (Canopy not installed).
HP3 - C1
IP21 drip proof canopy for horizontally mounted HP3 DBR unit. (Canopy not installed).
MECHANICAL DATA
Mounting, Dimensions and Weight
Units have ‘keyhole’ mounting points suitable for M8 fixings. Two keyholes are located inside the terminal compartment. HP1 is supplied with a single keyhole plate that clips to the opposite end of the unit. HP2 and HP3 are each supplied with two keyhole plates.
The dimensions given below include an allowance for protruding fixings etc. Allow an additional 15mm for correct fixing alignment in keyholes, during installation.
HP1, HP2, HP3 Side View
HP1 Top View
[HP2], {HP3} Top View
Unit is designed for mounting horizontally with the largest open face up. Other orientations may result in increased element temperatures.
Warning - units must never be situated so that the terminal box is the highest point of the resistor. Units must never be situated so that the largest open face is at the bottom.
Weight: HP1 - 4.5kg, HP2 - 6.5kg, HP3 - 8.5kg
Canopy: Fitting of a canopy will increase height by 23mm. The canopy overhangs the edges of the enclosure by 22mm.
Connections
Power: Screw terminals for up to 4mm2 cable Earth: M6 earth stud Thermal sensor: 6.25mm male receptacle blade (faston) connections Cable Entry: 20mm knock out holes provided on outward facing sides and bottom of terminal compartment.
Safety
Resistors get hot in normal operation. Use guards and warning labels where necessary. Avoid proximity to flammable materials. Do not cover. Provide adequate ventilation. Fault conditions in the circuit that feeds the resistor, or the resistor itself, may lead to excessively high temperatures. Restrict access to qualified personnel only.
