Drive Controller

(Also called Variable Speed Drive) An electronic
device that can control the speed, torque,
horsepower and direction of an AC or DC motor.

Driptight

"Driptight" means that a device is so constructed
or protected as to excluded falling dirt or drops
of liquid under specified test conditions.

Drift

Drift is the deviation from the initial set speed
with no load change over a specific time period.
Normally the drive must be operated for a
specified warm-up time at a specified ambient
temperature before drift specifications apply.
Drift is normally caused by random changes in
operating characteristics of various control
components

Double or Split Door (lighting panels)

In a lighting contactor panel, one door is used to
cover the contactor and the other is used to
cove the branch breakers.

Door-In-Door (lighting panels)

Trim has an inner door over the branch
disconnect area secured with one latch. An
outer door covers the gutter area also secured
by a single latch. There is another flange around
the entire box.