maxon motor
Operating Instructions
1-Q-EC Amplifier DEC 50/5
10 Protection
10.1 Protection against heat overload
If the power stage temperature exceeds a limit of around 100°C for longer than 1.5 s, the
output stage is switched off.
The error mode is shown in diagram form (see
chapter 9 “Operating Status Display”
).
If the power stage temperature falls below 80°C, the motor is restarted. A speed ramp
will be performed during acceleration.
10.2 Blockage protection
If the motor shaft is blocked for longer than 1.5 s, the current limit is set at 4.2 A, pro-
vided the current limit was not set at a lower value via the I
max
potentiometer.
Note
The blockage protection is not active in current control mode.
11 EMC-compliant installation
Power supply (+V
CC
- Power Gnd)
•
No shielding normally required.
•
Star point-shaped wiring if several amplifiers are supplied by the same power supply.
Motor cable (> 30 cm)
•
Shielded cable highly recommended.
•
Connect shielding on both sides:
DEC 50/5 side:
Bottom of housing.
Motor side:
Motor housing or with motor housing mechanical design with low resis-
tive connection.
•
Use separate cable.
Hall sensor cable (> 30 cm)
•
Shielded cable highly recommended.
•
Connect shielding on both sides:
DEC 50/5 side:
Bottom of housing.
Motor side:
Motor housing or with motor housing mechanical design with low resis-
tive connection.
•
Use separate cable.
Direct connection motor/Hall cable (
≤
30 cm) on DEC 50/5
•
Shield casing over motor/Hall connection cable
•
Connect shielding on both sides
or
•
Lowest resistive connection of motor housing and bottom of DEC 50/5 housing
•
Cable design of motor/Hall connection cable as close as possible with aforementioned
connection
Analogue signals (AUX, Speed)
•
No shielding normally required
•
Use cable shielding with analogue signals with small signal level and electromagnetically
harsh environment
•
Normally connect shielding on both sides. Place shielding on one side if there are 50/60
Hz interference problems.
Digital signals (Disable, Direction, Brake)
•
No
shielding
necessary.
See also block diagram in
chapter 12
.
In practical terms, only the complete equipment, comprising all individual components (mo-
tor, amplifier, power supply unit, EMC filter, cabling etc.) can undergo an EMC test to ensure
interference-free CE-approved operation.
October 2008 Edition / Doc.No. 544910-06 / subject to change
maxon motor control
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