44
APEX615n Installation Guide
EXAMPLE 2: The next drawing illustrates how to connect auxiliary resistors to control
motor braking. The drawing shows that during normal operations, the motor contactor is
energized and provides a direct connection between the motor and drive. The motor contactor
(N.O. = normally open with power removed; N.C. = normally closed with power removed)
is controlled by the fault relay terminals on the APEX6151's resolver connector. If the drive
faults or if the line voltage is disconnected, the contactor connects the motor braking resistors
across the motor.
Resolver Cable
APEX615n
Fault Relay+
Motor
Contactor
N.O. N.C.
R
Y
OR
R
∆
R
∆
R
∆
R
Y
R
Y
Motor Cable
Fault Relay–
5A Maximum at
24VDC or 120VAC
CHA+
CHA -
CHB+
CHB -
CHZ+
CHZ -
Gnd
Shield
Red
Blk
Grn
Blu
Brn
Wht
M T +
M T -
Flt Relay+
Flt Relay -Flt Relay -
NC
NC
Encoder Output
Out-P
In-P
Aux-P
Programmable Inputs/OutputsProgrammable Inputs/Outputs
12
5049
Ref Sin Cos
Phase C
Phase B
Phase A
Motor Ground
Motor Braking with Resistors
The braking resistors can be sized by analyzing specific applications. If the total load inertia is
less than five times the rotor inertia, non-inductive 200 watt power resistors can be used as the
braking resistors. For a wye configuration, use 5 ohms or more (R
Y
= 5Ω). For a delta
configuration, use 15 ohms or more (R
∆
= 15Ω). If quicker stopping is required, the braking
resistor values can be lowered, but you must increase their power ratings.
CAUTION
Braking resistors provide very little braking at zero velocity
.
If standstill braking or emergency
stopping is required, you can order the optional spring-type mechanical brake described in
Example 1
above.
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