Kollmorgen AKM, Instruction Manual

Page: 18 / 212

AKM Installation | 1 English
1.4.12 Holding brake
All motors are optionally available with a holding brake. A spring applied brake (24V DC) is
integrated into the motors. When this brake is de-energized it blocks the rotor.
WARNING
If there is a suspended load (vertical axes), the motor's holding brake is
released, and, at the same time, the servo drive does not produce any out-
put, the load may fall down! Risk of injury for the personnel operating the
machine. Functional safety in case of hanging loads (vertical axes) can
be ensured only by using an additional, external, mechanical brake.
The holding brakes are designed as standstill brakes and are not suited for repeated oper-
ational braking. In the case of frequent, operational braking, premature wear and failure of the
holding brake is to be expected.
The motor length increases when a holding brake is mounted.
The holding brake can be controlled directly by the servo amplifier (no personal safety !), the
winding is suppressed in the servo amplifier — additional circuitry is not required (see instruc-
tion manual of the servo amplifier). If the holding brake is not controlled directly by the servo
drive, an additional wiring (e.g. varistor) is required. Consult our support department.
Brake data are listed in chapter "Technical Data Brakes" from (
➜
# 184) .
1.4.13 Fan for AKM7
For the AKM7 model size, an add-on kit for forced ventilation is available. The integrated fan
enables up to 30% more power output for the AKM7 motors. Assembly instructions for the
fan kit is contained within the scope of delivery of the add-on kit.
The fan housing can be mounted either with both the supplied
brackets and spacers or with the brackets only. The choice of
mounting method depends on the application. If strong vibra-
tions are expected, you should use both brackets and
spacers. Motors with integrated brakes require the longs
spacers.
Make sure, that free air flow is available for the fan. Keep a space of at least 25 mm behind
the fan guard.
The motors become dirty considerably faster due to forced convection. Dirt deposits lead to
falling cooling capacity and can put the motors at risk. Dust may burn in case of over-
heating.So clean the air duct, the fan, and the motor at regular intervals.
By adding a fan, the mounting dimensions of AKM7 motors increase.
In case of AKM7 motors with connector option "C", winding "Q" and forced ventilation you
must limit the motor current to 23,5 A for connector protection.
You can find technical information on AKM7 motors with fans (
➜
# 181).
You can find the dimensional drawing for AKM7 motors with fans on (
➜
# 195).
18 Kollmorgen | kdn.kollmorgen.com | June 2018