Delta Tau PMAC2A-PC/104 Instrukcja Obsługi Pobierz pdf (Strona 20)

PMAC2A-PC104 Hardware Manual

Machine Connections

Dry Contact

Flag_1_2_V

JMACH2

PLIM+

5 – 24 VDC

Power Supply

5-24 Volts proximity

Flag_1_2_V

JMACH2

PLIM+

5 – 24 VDC

Power Supply

DAC Outputs Power Supply

0.3A @ +12 to +15V (4.5W)

0.25A @ -12 to -15V (3.8W)

(Eight-channel configuration)

• The host computer provides the ±12 Volts power supply in the case PMAC is installed in the PC/104

bus. With the board stack into the bus, it will automatically pull ±12V power from the bus and it

cannot be disconnected. In this case, there must be no external ±12V supply, or the two supplies will

"fight" each other, possibly causing damage. This voltage could be measured on the TB1 terminal

block.

• In a stand-alone configuration, when PMAC is not plugged in a computer bus, it will need an external

±12V supply only when the digital-to-analog converter (DAC) outputs are used. The ±12V lines from

the supply, including the ground reference, can be brought in either from the TB1 terminal block or

from the JMACH1 connector.

Flags Power Supply

Each channel of PMAC has five dedicated digital inputs on the machine connector: PLIMn, MLIMn

(overtravel limits), HOMEn (home flag), FAULTn (amplifier fault), and USERn. A power supply from 5

to 24 Volts must be used to power the circuits related to these inputs. This power supply can be the same

used to power PMAC and can be connected from the TB1 terminal block or the JMACH1 connector.

Over-Travel Limits and Home Switches

When assigned for the dedicated uses, these signals provide important safety and accuracy functions.

PLIMn and MLIMn are direction-sensitive over-travel limits that must conduct current to permit motion

in that direction. If no over-travel switches will be connected to a particular motor this feature must be

disabled in the software setup through the PMAC Ix25 variable.

Types of Overtravel Limits

PMAC expects a closed-to-ground connection for the limits to not be considered on fault. This

arrangement provides a failsafe condition. Usually, a passive normally close switch is used. If a

proximity switch is needed instead, use a 5 to 24V normally closed to ground NPN sinking type sensor.

Home Switches

While normally closed-to-ground switches are required for the overtravel limits inputs, the home switches

could be either normally close or normally open types. The polarity is determined by the home sequence

setup, through the I-variables I9n2. However, for the following reasons, the same type of switches used

for over-travel limits are recommended:

• Normally closed switches are proven to have greater electrical noise rejection than normally open

types.

• Using the same type of switches for every input flag simplifies maintenance stock and replacements.

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