Rexroth Diax 04 HDD and HDS
Instructions for Use
5-11
DOK-DIAX04-HDD+HDS*UL*-IB01-EN-P
DANGER
Dangerous movements! Persons at risk by
falling or dropping axles!
⇒
The standard motor holding brake as delivered, or
any external motor holding brake activated by the
drive controller by itself does not provide adequate
personal protection!
⇒
Personal protection must be ensured by primary
failsafe measures:
The dangerous zone must be blocked off by a safety
fence or safety grates.
After the motor is switched off, vertical axes must be
additionally protected from falling or dropping, e.g.
as follows:
- by mechanically locking the vertical axis,
- by an external braking, catching or clamping unit,
- by adequately counterbalancing the weight of the
load.
Warning
If a motor holding brake is used, then it is necessary to
connect an external 24 V three-phase voltage source.
The 0 V
ext
( = 0 V
B
) must be galvanically connected with
the reference potential or housing of the drive controllers!
Maximum permissible brake current: 2 A
If the brake currents exceed this value, the motor holding
brake must be actuated via an external switching device.
When you use an external switching device the control of
the holding brake must not be done by the drive controller
directly.
Current consumption of the holding brake is listed in the Project Planning
Manual of AC motors.
The AC motor holding brake is not a dynamic brake. It wears down after
about 20,000 motor revolutions against the closed brake disc.
Note:
To release a holding brake in the MHD/MKD servo motors, an
ex24 V DC / +10 % must be supplied to the drive. The
voltage to release the brake is applied to X6/3 (+24 V) and
X6/6 (0 V). It must be ensured that the brake will release even
if longer motor power cables are used (voltage drop with long
motor power cables can be compensated by increasing supply
voltage (up to DC +26.5 V) and/or with a regulated voltage
supply at X6/3 and X6/6).
The drive controller controls the holding brake. When you use an external
switching device the control of the holding brake must not be done by the
drive controller directly.
Motor temperature monitoring (TM+, TM)
Connections TM+ and TM- are used to evaluate the temperature of
connected Rexroth motors. These are equipped with a temperature-
dependent resistor (either PTC or NTC dependent on the motor type) to
monitor temperature. The connection leads are in the motor power cable.
Control of the motor holding
brake
