User Manual Instruction Manual

Application Notes

13-5

13.3 External Brake Resistor

When using an external dynamic braking resistor, the resistor must be equipped with a

thermostat that opens under the condition of excessive heat in the resistor. Figure 13

depicts the wiring of the DB resistor thermostat.

Note: An auxiliary contact form from the M contactor should be wired to a digital input

on the drive that is programmed to function as a drive enable. See attention note

regarding input contactors in section 4.1.2.

13.4 Lifting/Torque Proving

The Torque Proving feature of the GV6000 is intended for applications where proper

coordination between motor control and a mechanical brake is required. Prior to

releasing a mechanical brake, the drive will check motor output phase continuity and

verify proper motor control (torque proving). The drive will also verify that the

mechanical brake has control of the load prior to releasing drive control (brake

proving). After the drive sets the brake, motor movement is monitored to ensure the

brakes ability to hold the load. Torque Proving can be operated with an encoder or

encoderless.

Torque Proving functionality with an encoder includes:

• Torque Proving (includes flux up and last torque measurement)

• Brake Proving

• Brake Slip (feature slowly lowers load if brake slips/fails)

Figure 13.1 – External Brake Resistor Circuitry

Power On

R (L1)

S (L2)

T (L3)

Power Source DB Resistor Thermostat

Power Off

(Input Contactor) M

Three-Phase

AC Input

M (AUX)

ENABLE