Commander SE Advanced User Guide 147
Issue Number: 4
The information to be entered into parameters 10.30 Maximum full power braking time and 10.31 Maximum full power
braking period for the protection of these resistors is given in the following tables. It can be seen that the ON time at 780VDC
on certain resistor values* is too small to be entered into parameter 10.30. The range of parameter 10.30 is 0.0 to 400.0 in
100ms steps.
The following ON times will increase the resistor element up to a temperature of 400°C. The following ‘duty cycles’ keep the
resistor case temperature below the thermostat trip temperature of 160°C. If the following times and duty cycle are exceeded,
the resistor thermostat will open.
Adiabatic ratings
These resistors have a low adiabatic rating. The adiabatic rating is the amount of heat the resistor element can withstand in a
single pulse without being damaged.
Maximum ON times
The following table gives the maximum ON times that the resistor can withstand without the element being damaged. The
table also gives the minimum OFF times before the next pulse to ensure that the resistor element does not get damaged and
also that the resistor case temperature does not exceed approx 160°C.
The following ON times will increase the resistor element up to a temperature of 800°C.
If these ON times are exceeded, the resistor will be damaged.
Alternative braking resistors
Alternative braking resistors can be sourced from the following braking resistor manufacturers:
Pentagon Electrical Products Ltd
www.pentagonelectric.co.uk
Cressall Resistors
www.cressall.com
REO
www.reo.co.uk
Resistor
T
ON
@ 390VDC T
OFF
@ 390VDC T
ON
@ 780VDC T
OFF
@ 780VDC
Ω mssmss
15 110 32 28* 32
20 135 29 34* 29
30 199 25 50* 25
40 218 23 54* 23
50 343 23 86* 23
75 249 18 62* 18
100 438 18 109 18
150 479 15 120 15
Resistor
T
ON
@ 390VDC T
OFF
@ 390VDC T
ON
@ 780VDC T
OFF
@ 780VDC
Ω mssmss
15 220 56 55* 56
20 270 51 67* 51
30 398 42 99* 42
40 436 40 109 40
50 686 41 172 41
75 497 31 124 31
100 876 31 219 31
150 959 26 240 26
NOTE
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