Lenze S94P01B2 - Manual (Page 21)

S94P01B2
19
Interface
4.1.5 P5 - 24 VDC Back-up Power Input
P5 is a 2-pin quick-connect terminal block that can be used with an external 24 VDC
(500mA) power supply to provide “Keep Alive” capability: during a power loss, the logic
and communications will remain active. Applied voltage must be greater than 20VDC.
P5 PIN ASSIGNMENTS (BACK-UP POWER)
Pin Name Function
1 +24 VDC Positive 24 VDC Input
2 Return 24V power supply return
WARNING!
Hazard of unintended operation! The “Keep Alive” circuit will restart the
motor upon restoration of mains power when the enable input remains
asserted. If this action is not desired, then the enable input must be
removed prior to re-application of input power.
4.1.6 P6 - Braking Resistor and DC Bus
P6 is a 5-pin quick-connect terminal block that can be used with an external braking
resistor (the PositionServo 940 has the regen circuitry built-in). The Brake Resistor
connects between the Positive DC Bus (either P6.1 or 2) and P6.3.
P6 TERMINAL ASSIGNMENTS (BRAKE RESISTOR AND DC BUS)
Pin Terminal Function
1 B+
Positive DC Bus / Brake Resistor
2 B+
3 BR Brake Resistor
4 B-
Negative DC Bus
5 B-
4.1.7 Connector and Wiring Notes
Note 1 - Encoder Inputs
Each of the encoder output pins on P3 is a buffered pass-through of the corresponding
input signal on P4. This can be either from a motor mounted (primary feedback)
encoder or from an auxiliary encoder when a resolver is the primary feedback device
on the motor.
Via software, these pins can be re-programmed to be a buffered pass through of the
signals from a feedback option card. This can be either the second encoder option
module (E94ZAENC1) or an encoder emulation of the resolver connected to the
resolver option module (E94ZARSV1, E94ZARSV2 or E94ZARSV3).
Note 2 - Encoder Outputs
An external pulse train signal (“step”) supplied by an external device, such as a PLC or
stepper indexer, can control the speed and position. of the servomotor. The speed of
the motor is controlled by the frequency of the “step” signal, while the number of pulses
that are supplied to the PositionServo 940 determines the position of the servomotor.
“DIR” input controls direction of the motion.