Allen-Bradley 1770-M10 Especificaciones descargar pdf (Pagina 162)

162 Rockwell Automation Publication PFLEX-AP009A-EN-P - September 2012

Chapter 1 Drive Comparisons

PowerFlex DC Motor Overload Protection

Thermistors and Thermal Switches

To detect motor overheating and protect the motor from overloading, an

external, user-supplied thermistor (PTC) or thermal switch must be connected

to terminals 78 and 79. The drive’s response to a motor over temperature fault is

configured in parameter 365 [OverTemp Flt Cfg]. If a temperature sensor is not

used, a 1k ohm resistor must be connected between terminals 78 and 79

(installed at the factory). The instructions for installing a thermal sensor are

detailed below.

Thermistors (PTC)

PTC thermistors fitted in the motor can be connected directly to the drive via

terminals 78 and 79. In this case the 1k ohm resistor is not required between

terminals 78 and 79.

Thermal Switches (Klixon

) in the Motor Windings

“Klixon” type temperature-dependent contacts can disconnect the drive from the

motor via an external control or can be configured as an external fault using a

digital input on drive. They can also be connected to terminals 78 and 79 in order

to indicate a drive “Motor Over Temp” fault (F16), though this is not

recommended due to the noise sensitivity of the current threshold circuitry. If a

thermal switch is used a 1k ohm resistor must be placed in series between the

switch and one of the terminals.

Table 72 - Contact Relay and Thermistor Terminal Designations

Terminal Description

35 Normally open contact. Configured with parameter 1392 [Relay Out 1 Sel] -

set to 25 “Contactor” by default.

75 Normally open contact. Configured with parameter 629 [Relay Out 2 Sel] -

set to 5 “Ready” by default.

78 Motor thermistor connections (PTC)

1 2 ... 157 158 159 160 161 162 163 164 165 166 167 ... 193 194

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Allen-Bradley 1770-M10 Especificaciones Pagina 162