288 ACQ550-U1 User’s Manual
Technical data
P
rx
– Duty-cycle based resistor power rating in deceleration braking, where “x” is
ON
MAX
time.
Installing and wiring resistors
All resistors must be installed outside the drive module in a place where they can
dissipate heat.
WARNING! The surface temperature of the resistor is very high, and air flowing from
the resistor is very hot. Materials near the brake resistor must be non-flammable.
Provide protection from accidental contact with the resistor.
To ensure that the input fuses protect the resistor cable, use resistor cables with the
same rating as used for the power input to the drive.
The maximum length of the resistor cable(s) is 10 m (33 ft). See section Power
connection diagrams on page 21 for the resistor cable connection points.
Mandatory circuit protection
The following setup is essential for safety – it interrupts the main supply in fault
situations involving chopper shorts:
• Equip the drive with a main contactor.
• Wire the contactor so that it opens if the resistor thermal switch opens (an
overheated resistor opens the contactor).
Below is a simple wiring diagram example.
Parameter set-up
To enable dynamic braking, switch off the drive’s overvoltage control [Set parameter
2005 = 0 (
DISABLE)].
ACQ550
U1 V1 W1
L1 L2 L3
1
2
3
4
5
6
13
14
3
4
1
2
K1
Q
Thermal switch (standard in
ABB resistors)
On
Off
Fuses
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