Technology Option F01 08.2012
6SE7087-6QX70 (Version AN) Siemens AG
9-122 Compendium Motion Control SIMOVERT MASTERDRIVES
9.6.3 Brake controller
The automatic brake controller [470], which is already integrated in the
standard MASTERDRIVES software, can be activated with P605 = 1 or
P605 = 2 for brakes with checkback contact(s) [470.7].
The integrated brake controller [470] prevents inconvenient pauses on
application and release of the brake. Even lifting systems are
positioned rapidly and reliably - with minimum effort required on the
external machine controller and during commissioning.
The output signals of the brake controller are the binectors "open
brake" B275 and "close brake" B276 [470.8]. Relays for actuation of the
brake are not installed in the MASTERDRIVES unit. The following
options are available for brake actuation:
♦ Use of a relay output on terminal expansion board EB2
♦ Use of an external relay actuated by a digital output of the
MASTERDRIVES
♦ The relay installed on compact and rack-mount units for main
contactor actuation can be used for the brake controller if no main
contactor is provided (P601 = 275).
The opening and closing of the brake can also be initiated by external
commands (using the connectors selected with P608, P609 and P614
[470.1]), however the brake controller normally operates fully
automatically without intervention from the external machine controller.
The BICO wiring required for this purpose is shown in the comment
boxes in [470]. The fully automatic brake controller normally operates
as follows:
When the drive switches to "operation" mode after power on, the
inverter enable is activated and the brake is opened. After the brake
opening time set in P606 (factory setting 200 ms [470.5]), if the "brake
open" checkback signal is active, the setpoint enable is activated.
The limit monitor, set in P611 [470.3], can be used in special situations,
in order to open the brake depending on a specific condition (e.g. if a
certain torque level is exceeded; in this case "brake open" is activated
by binector B281 and binector B277 "setpoint enable" must not be
wired directly).
When the drive is brought to a standstill, i.e. when its speed has
dropped below the threshold set in P616 [470.3] and it is switched off
with OFF1, OFF2 or OFF3, the brake closes. The inverter enable is
canceled when the brake closing time set in P607 has expired (factory
setting 100 ms [470.5]) and the "brake closed" signal is activated (by a
checkback contact if one is installed). You should avoid using OFF2
where possible, since the pulses are disabled immediately on an OFF2
command, and the motor is already without power during the brake
closing time.
Open brake
Close brake
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