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11. Protection Circuits
The QD-4000 was designed with built in protection circuits to guard against unsafe
operating conditions. Although the servo design includes these protective features,
Nutfield Technology, Inc. makes no warrants and assumes no responsibility in the event
of a servo or galvanometer failure resulting in lost productivity, property damage or
personal injury. The system integrator of NTI products assumes all responsibility for the
safe operation of equipment.
11.1 Servo Faults
The QD-4000 has a green Servo Power LED (D8) and a red Fault LED (D7) that
indicate that if one of the fault conditions has occurred. The board also provides to the
user on the Main Board Connector J8, two unique signals that indicate if a fault has
occurred.
Servo Status LED's – D7 and D8 (see Servo Driver Drawing)
Servo Power: The +/- voltage regulators are on.
Fault: A fault condition has occurred.
11.1.1 Power Failure Condition
If the green LED is off or dim, one of the two voltage rails (+ or – supply voltage) is not
present.
11.1.2 Under Voltage Condition
If the red LED is on, one or both of the voltage rails may be less than +14 or –14 volts.
11.1.3 Over Position Condition
If the red LED is on, the galvanometer rotor may be more than 6% out of position range.
91-0027 Rev. E
QuantumDrive-4000 Manual
LED #
COLOR
D8
Green
D7
Red
Copyright © Nutfield Technology, Inc.
STATUS
Power On
Servo Fault
27
6/2010
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