3-4 FH100 Precision Variable-Speed Peristaltic Pump System Operating Manual Cole-Parmer
Section 3
Operation
External Inputs
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 6 and 7
(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 6 and
7 and a control voltage greater than 0V or a control current greater than 4
mA 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 4 of the
“D” shell connector (Local/Remote) to pin 5 (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. The accessory
Footswitch (part no. 07595-40) and Dispenser Wand (part no.
77722-80) are connected internally in this way.
NOTE: The signal common for the speed control voltage and current
inputs is referenced to earth ground.
The START/STOP (pin 7) input, CW/CCW (pin 8) and Local/Remote
(pin 4) are digital inputs. They are internally pulled up to +5 V with
respect to logic common (RETURNS). They can alternately be driven
with open collector logic. For increased noise immunity, use of contact
closures is recommended.
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