1-2
L/S Precision Variable-Speed Drives Operating Manual
Masterflex
Section 1
Introduction
Controls, Indicators
and Connectors
Figure 1-1.
Controls, Indicators and Connectors
A
B
E
C
D
A. POWER (ON/OFF) SWITCH: Turns the unit ON or OFF.
B. SPEED KEYS: Sets the speed of the pump. The higher the number, the
faster the speed of the pump. When the speed key is depressed the
smallest speed units change first followed by an increasing rate of change.
C. FLOW DIRECTION KEY: Sets the direction of pump rotation
Clockwise/Counterclockwise. An LED annunciator indicates the
active direction. The motor is brought to a controlled stop before
reversing direction.
D. INTERNAL/EXTERNAL KEY: Changes the drive operation mode.
Internal (Local) operation from the front panel keypad is designated
by INT, external (Remote) operation is designated by EXT. In INT
mode, START/STOP, FLOW DIRECTION, and SPEED keys on the
front panel determine operating state. Depression and release of keys
enables toggling between the two operating states.
E. START/STOP KEY: Upon depression, key toggles the motor
ON/OFF during INT mode. This key will not start the drive if in
EXT mode. If pressed while operating in EXT mode (stop desired),
the button will always stop the drive and a toggle of the EXT
Start/Stop is required to restart the drive.
F. EXTERNAL/REMOTE CONNECTOR: Utilized to connect wiring
for remote control operation with a 18-Pin Round connector.
G. IEC Power Entry Module/Line Cord: Utilized to connect line cord to
drive. See
page 4-1
for alternative cords.
H. OHS (Open Head Sensor) Socket: For use with OHS equipped
MASTERFLEX Pump Heads.
G
H
F
