L/S Precision Variable-Speed Drives Operating Manual 3-3Masterflex
Section 3
Operation
The front INT/EXT key enables external functions. Switching to INT on
the display disables the external functions, allowing the front panel
controls to operate the pump.
When the INT/EXT key is in the EXT position, starting and stopping the
pump is controlled by an external contact closure between pins 4 and 8
(Jumper B), and the pump speed is determined by an externally supplied
0–10V or 4–20 mA source. Connection must be made between pins 4 and
8 to Start/Stop the drive and a control voltage greater than 0V between
pins 1 and 5 or a control current greater than 4 mA between pins 3 and 5
must be applied for the pump to run.
If setting the speed from the front panel is desired with external Start/Stop
contact operation, the INT/EXT key must again be in the EXT position.
In addition, Jumper A should be in place. Jumper A connects pin 14
(Local/Remote) to pin 10 (Local/Remote Reference). Start/Stop will then
be controlled from the rear panel (Jumper B), and the pump speed will be
controlled from the front panel.
NOTE: The signal common for the speed control voltage and current
inputs is not referenced to earth ground.
The START/STOP, CW/CCW and Local/Remote are digital inputs. They
are internally pulled up to +5 V with respect to earth ground via pins 8
and 10. They can alternately be driven with open collector logic. For
increased noise immunity, use of contact closures is recommended
WARNING: A contactor or other device that routinely
disconnects and reapplies the AC line to the drive to start and
stop the motor can cause drive hardware damage. The drive is
designed to use control input signals that will start and stop the
motor.
External Inputs
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