Introduction and Technical Data 29
Dual Cur rent Clamp Enable Digital input DIO4 T21
This input alters the configuration of the current clamps. When the input is low , Analogue input T6 provides
a symmetric bi-polar current limit. When high, analogue input T6 is the positive current clamp and analogue
input T5 is the negative current clamp.
Zero speed Digital Output DOP1 T22
The operating level of this output can be modified by 117) ZERO INTLK SPD % to give the desired speed
threshold of operation. A high output + 24V indicates Zero speed.
Ramping flag Digital Output DOP2 T23
This goes high w hen the Run Mode Ramp is ramping. (Used to prevent speed loop integration during ramp).
Drive healthy Digital Output DOP3 T24
This output is high when the controller is healthy. This means that no alarms have tripped and the drive is
ready to run.
OV terminal 0V T25
DC Tachogenerator Input TACH T26
Full speed setting range + /-10V to + /-200 V. Input impedance 150K Ohms. Signal range 0V to + /-200 V.
User + 10V Reference + 10V T27
User -10V R eference -10V T28
+ /-10.00 V, 0.5%, 10m A max. Short circuit protection to 0 V
Armature Current Output IARM T29
0 to + /-5 V linear output for 0 to + /-100 % model current. Output current capability + /-10m A max. Short
circuit protection to 0 V. Programmable Uni-polar or Bi-polar output mode.
Motor thermistor input THM T30
It is good practice to protect DC motors against sustained thermal overloads by fitting temperature sensitive
resistors or switches in the field and interpole windings of the machine. These devices have a low resistance
(typically 200 Ohm) up to a reference temperature 125 C. Above this temperature, their resistance rises
rapidly to greater than 20 00 Ohms. Motor over-temperature sensors should be connected in series bet ween
terminals T30 and T36. A motor over-temperature alarm will be displayed if the external resistance bet ween
T30 and T3 6 exceeds 1800 Ohms ± 20O Ohms. See 8.1.11.6 DRIVE TRIP MESSA GE / Thermistor on T30.
Terminals T30 and T36 (0V COM) must be linked if external over-temperature sensors are not use d.
3.5.1 Run, Jog, Start, Cstop
Run Di gital input RUN T31
The RUN Input provides a means of electronically inhibiting controller operation.
If the RUN input is low, all control loops will be inhibited and the motor stops.
RUN also controls the field. See 6.9 CH ANGE PARA METERS / FIELD CONTROL.
If the contactor is being held in by a) The zero speed detector while the motor is
decelerating or b) The contactor drop out delay, then this will be terminated by
RUN going low and will result in immediate contactor drop out.
(The RUN input terminal may also be used as a programmable digital input if it is
not required as a RUN function)
WARNING. Do not rely on any drive function to prevent the motor from operating when personnel are
undertaking maintenance, or when machine guards are open. Electronic control is not accepted by safety
codes to be the sole means of inhibition of the controller. Always isolate the power source before working on
the drive or the motor or load.
If the RUN input goes low at any point during the stopping process, e ither heading for zero spe ed or during
the delay period, then the contactor wi ll drop out straight away.
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