User manual

High-speed counters, EZ-DA, EZ-DC

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Example running motors or spindles in parallel.

Applications may involve motion control with the parallel

control of two drives. Only certain deviations are permissible

so that the mechanical system does not jam.

These tasks can be implemented with the following solution.

I8 starts the drives. I7 and I6 carry the feedback signals of the

motor-protective circuit-breakers. The drives are stopped if a

motor-protective circuit-breaker trips. The analog value

comparators control the difference of the path distance. The

appropriate drive is stopped temporarily if one path distance

is outside of the set tolerance. The coils and contacts have the

following meanings:

• M8 = enable for all drives

• Q1 = drive 1, counter drive 1 is connected with input I1 and

this with high-speed counter C13.

• Q2 = drive 2, counter drive 2 is connected with input I2 and

this with high-speed counter C14.

• A1 = comparison, if C13 is less than C14, drive 2 is too fast.

• A2 = comparison, if C14 is less than C13, drive 1 is too fast.

• A3 = comparison, if C13 and C14 are equal, both drives can

be activated.

• The hysteresis value of A1, A2 and A3 depends on the

resolution of the transducer and the mechanical system.

Circuit diagram display Parameter settings of the counter C13

I8-I7-I6-ÄM8

M8ua2u---ÄQ1

dA3k

da1u---ÄQ2

hA3k

--------uCC

hCC

H+

S +0

EZ500_700.book Page 133 Tuesday, May 3, 2005 5:15 PM