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Design variants
5.2
Model with integrated brake resistor
Applies to JM-3Pxx-R1
5.2.1
Purpose of this design variant
In generator operation, e.g. when the drive is braking, the motor feeds energy back into the servo ampli-
fier. This increases the voltage in the DC link. If the voltage exceeds a threshold value, the internal braking
transistor in the supply unit is switched on and the regenerative energy is converted into heat by means of
a brake resistor.
The design variant described here is a cost-effective option for braking drives with small masses without
additional effort.
In addition, the integrated brake resistor has the great advantage that no additional space is required as
would be the case for an external brake resistor.
However, the braking power is limited for thermal reasons.
The technical data for BG1 can be found in chapter A.1.1 and for BG2 in section A.2.1.
5.3
Model without 24 V switch-mode power supply unit
Applies to JM-3Pxx.
5.3.1
Purpose of this variant
This variant enables you to supply the control unit of the JM-3000 system with an already existing external
switch-mode power supply unit.
The external switch-mode power supply unit must meet the following minimum requirements:
y Uv = 24 V ±10 %, stabilized and smoothed (operating voltage)
y Output power as per selected supply unit and servo amplifiers connected
y Internal polarity reversal protection
y The power supply unit used must have a safe separation from the mains in accordance with EN
50178 or EN 61800-5-1.
y The start-up current for the control voltage can be 2-3 times the operating current for a brief time.
y If other devices are supplied by this switch-mode power supply unit, its power rating must be cor-
respondingly higher
NOTICE
Jetter AG
DAMAGE TO THE DEVICE DUE TO FAULTY WIRING
CONSIDERABLE MATERIAL DAMAGE POSSIBLE
IF NOT AVOIDED.
y The 24 V/GND connection on the supply unit is at earth potential
(see PELV). Other consumers can be damaged by connecting e.g.
control cable screens. Please check connections beforehand.
JetMove 3000 Supply Unit
59
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