Projecta IM2000 Instruções de Operação descarregar pdf (Página 21)

out of each phase reservoir. This results in a less than expected current draw on

the power supply.

Stepping motor drivers are designed with the intent that a user’s power supply

output will ramp up to greater than or equal to the minimum operating voltage

of the drive. The initial current surge is substantial and could damage the driver

if the supply is undersized. The output of an undersized power supply could

fall below the operating range of the driver upon a current surge. This could

cause the power supply to start oscillating in and out of the voltage range of

the driver and result in damage to either the supply, the driver, or both.

There are two types of supplies commonly used, regulated and unregulated,

both of which can be switching or linear. Each have advantages and disadvan-

tages.

Regulated vs. Unregulated

An unregulated linear supply is less expensive and more resilient to current surges,

however, the voltage decreases with increasing current draw. This may cause

problems if the voltage drops below the working range of the drive.

Fluctuations in line voltage are also a point of concern. These fluctuations may

cause the unregulated linear supply to be above or below the anticipated or

acceptable voltage.

A regulated supply maintains a stable output voltage, which is good for high speed

performance. These supplies are also not affected by line fluctuations, however,

they are more expensive. Depending on the current regulation, a regulated supply

may crowbar or current clamp and lead to an oscillation that, as previously stated,

can cause damage to the driver and/or supply. Back EMF can cause problems for

regulated supplies as well. The current regeneration may be too large for the

regulated supply to absorb. This could lead to an over voltage condition which

could damage the output circuitry of the IM483.

Non IMS switching power supplies and regulated linear supplies with

overcurrent protection are not recommended because of their inability to

handle the surge currents inherit in stepping motor systems.

Table 5.1: Motor Power Supply Specifications

snoitacificepSylppuSrewoProtoM

noitacificepS

epyTylppuSdednemmoceRCDdetalugernU

egatloVelppiR %01±

egatloVtuptuOCDV54+ot21+

*tnerruCtuptuO kaePA3

rotomeht,egatlovylppusrewopehtnotnednepedsidedeentnerructuptuoehT*

.daolehtdnanoitceles

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 76 77

Sem comentários

Projecta IM2000 Instruções de Operação Página 21