System Manual V2 – MOVITRAC® B
125
6
Mains and motor connection
Project Planning
6.9.1
Brake rectifier
The brake rectifier can be switched off in two ways causing the brake to be applied:
1. Cut-off in the AC circuit
2. Cut-off in the DC and AC circuit (faster cut-off)
Always switch off the brake on the DC and AC sides in:
•
All hoist applications
6.9.2
Activating the brake
Always activate the brake via binary output DOØ2 "/Brake": do not use the PLC.
The binary output DOØ2 "/Brake" is configured as an output for operating a relay with
free-wheeling diode and a control voltage of DC +24 V / max. 150 mA / 3.6 W. A power
contactor can be controlled directly with a DC 24 V coil voltage or the BMK brake recti-
fier. This power contactor is used to switch the brake.
The startup function in the FBG11B keypad and in the MotionStudio software sets the
brake parameters for the 2-pole and 4-pole motors from SEW-EURODRIVE. The brake
parameters (P73_) must be set manually in the case of SEW-EURODRIVE motors with
a higher number of poles and non-SEW motors.
6.9.3
Brake parameters
6.10
Mains and motor connection
6.10.1 Permitted voltage supply systems
NOTE
The brake parameters are adapted to the brake activation arrangement shown in the
wiring diagram. If the values set for the brake release and application times are too
short, e.g. for long response times in the brake control system, hoists, for example,
may sag.
NOTE
•
Voltage supply systems with grounded star point
MOVITRAC
®
B is intended for operation on TN and TT systems with directly
grounded star point.
•
Voltage supply systems with non-grounded star point
Operation on mains systems with a non-grounded star point (for example IT
power systems) is also permitted. SEW recommends using an earth-leakage
monitor for this according to the PCM (pulse code measuring) principle. Using
such devices prevents the earth-leakage monitor from mis-tripping due to the
ground capacitance of the inverter.
•
External conductor grounded voltage supply systems
Operate the inverters on supply systems with a maximum phase-to-earth voltage
of AC 300 V only.
Содержание MOVITRAC MC07B0037-2A3-4-00
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