© Ernst Nagel GmbH 2S Trimmer Service Manual en.doc Rev.1.0. 20.07.2011
123
Contents
7. PCB’S
(continued)
7.2 LED’S & TEST POINTS
7.2.1 Motor Drive (MD6DC) PCB1 & PCB5
This board controls the motors, encoders,
switches and sensors connected to this
board.
Motor control is on a low level; e.g. servo
and/or speed control
D1: Yellow LED flashes when power is
on. The flashing indicates that a
program is present and functioning.
Should a download fail or the 5V is
missing, LED would be OFF.
D2: Red LED flashes whenever
information is sent or received on the
Internal
CAN.
D15: Green LED permanently OFF. It has
Fig. 7.7
no direct function in this configuration.
+
UNREG
:
Outgoing unregulated 36V, after interlock relay. Measure between Test Point +UNREG and
Test Point GND/PGND using a voltmeter. The voltage will be shown on the voltmeter unless:
- Voltage is outside allowed range. Voltage will be 0V.
- Machine is interlocked (i.e. the top cover is open). Voltage will be 0V.
VCC
:
Stabilised and rectified 5V made from incoming 10V AC from transformer.
- Measure between Test Point VCC and Test Point GND/PGND using a voltmeter.
The voltage will be shown on the voltmeter. Range 4.9-5.1V.
GND / PGND
: Ground /Power Ground is the minus when measuring either unregulated 36V (+UNREG) or
5V
(VCC).
D15
D2
D1
+UNREG
VCC GND/PGND