Rockwell Automation FlexPak 3000 Digital DC Drive Version 4.3 - Manual (Page 33)

Configuring the Speed Reference 4-13
4.2 Configuring Trim
The trim feature allows an offset to be added to or subtracted from the speed
reference. The amount of trim can be proportional to the upstream speed reference or
incremental. An incremental trim signal is derived from the resultant
DRAW
PERCENTAGE OUT (P.196) and the specified TOP SPEED (P.011).
Trim is based on the signal from the source you select in TRIM REFERENCE SELECT
(P.108). The choices are:
•
ANALOG MANUAL : The trim reference signal is based on the analog manual reference
signal (terminals 16, 17, and 18) after it has been limited and scaled.
•
REGISTER : The trim reference signal is based on the value set in TRIM REF REGISTER
(P.107).
•
ANALOG IN 1 or 2: (I/O Expansion kit only.) The trim reference signal is based on
analog in 1 or 2 from the I/O Expansion kit.
•
NETW IN REG 1, 2, OR 3: (Network only.) The trim reference signal is based on
network input register 1, 2, or 3.
The selected trim reference is limited to within ± TOP SPEED and multiplied with TRIM
RANGE (P.109) to generate DRAW PERCENTAGE OUT (P.196). DRAW PERCENTAGE OUT
modifies DECELERATION TIME and ACCELERATION TIME when TRIM REFERENCE SELECT is
set to PROPORTIONAL .
The input that can be used for the manual trim reference can also be used as the
analog manual reference. Make sure this input (terminals 16, 17, and 18 on the
Regulator board) is not being used for both functions at the same time.
Example
To use an analog manual reference to generate a 0 to 10% trim adjustment to the
speed reference setting, make these settings:
• Set TRIM REFERENCE SELECT (P.108) to ANALOG MANUAL
• Set TRIM RANGE (P.109) to 10%
• Set TRIM MODE SELECT (P.110) to INCREMENTAL
These settings will provide a 0 to 10% trim adjustment through the entire speed range.