(D08) should be set to a level slightly above the motor slip frequency that is likely to occur under the highest expected load that is applied to the motor

when the brake is released.

The brake apply frequency threshold is used to ensure that the brake is applied before the motor frequency reaches zero and to prevent the motor

rotating (in the reverse direction due to an overhauling load for example) during the brake apply time. If the frequency falls below Brake Control: Brake

Apply Frequency (D09), but the motor is not required to stop (i.e. reversing direction without stopping) then Reference On (D10) will be one, and so

the brake is not applied. This prevents the brake from activating and de-activating as the motor passes through zero speed. If the frequency falls

below Brake Control: Brake Apply Frequency (D09) and Reference On (D10) = 0 then the brake will be applied.

RFC-A, RFC-S

The speed comparator is used on starting, to detect when the motor speed has reached a level where the motor can produce the required amount of

torque to ensure that the motor rotates in the demanded direction when the brake is released. Brake Control: Brake Release Speed (D08) should be

set to a level slightly above the motor slip frequency that is likely to occur under the highest expected load that is applied to the motor when the brake

is released.

The brake apply speed threshold is used to ensure that the brake is applied before the motor speed reaches zero and to prevent the motor rotating (in

the reverse direction due to an overhauling load for example) during the brake apply time. If the speed falls below Brake Control: Brake Apply Speed

(D09), but the motor is not required to stop (i.e. reversing direction without stopping) then Reference On (D10) will be one, and so the brake is not

applied. This prevents the brake from activating and de-activating as the motor passes through zero speed. If the speed falls below Brake Control:

Brake Apply Speed (D09) and Reference On (D10) = 0 then the brake will be applied.

D10

Reference On

Mode

Open Loop, RFC-A, RFC-S

Minimum

Default

Type

1 Bit Volatile

Display Format

Standard

Coding

RO, ND, NC, PT

Reference On (D10), which is controlled by the drive sequencer, indicates that the reference from the reference system is active.

D11

Brake Contact Monitoring Select

Mode

Open Loop, RFC-A, RFC-S

Minimum

Default

Type

8 Bit User Save

Display Format

Standard

Coding

RW, TE, BU

Value

None

IP 1

IP 1 + IP2

When set to Off (0), brake contact monitoring is disabled.

When set to On (1), brake contact 1 monitoring is enabled where Brake Contact Monitoring Input 1 (D12) is monitored to determine the state of the

contactor. It is assumed that if Brake Contact Monitoring Input 1 (D12) = Off (0) the contact is open (brake applied), and if Brake Contact Monitoring

248

Electrical

Getting

User Menu A Commissioning

installation

started

Text

Advanced

Diagnostics Optimization CT MODBUS RTU Technical Data

Parameters

Open-Loop: 20.0

Maximum