DWG. NO. 02Y00025-0346
SHEET NO. 1 OF 10
E F F . 6 / 1 2 / 9 2
( m - df )
For GPD 503 Adjustable
Frequency Drives
CT: 1-30HP, 230V; 1-60HP, 460V
VT: 1-40HP, 230V; 1-75HP, 460V
CHANGE RECORD
1 STD-5297 8-13-92
2 STD-5523 5-12-93
PID Software Kit
Part No. SK-PID1-L503
DESCRIPTION
The PID Software Kit consists of two EPROMs and this
instruction sheet. It allows the user to modify a "Low
Horsepower" rated GPD 503 drive so it will have PID
capability; that is, it will be able to regulate a controlled
variable such as speed, pressure, flow, etc., by
comparing a feedback signal to a reference signal. It
then performs the necessary calculations on the
difference between the two signals (error) in order to
compensate for the dynamic changes in the system.
After changing out the EPROMs to introduce the PID
algorithm into the GPD 503, some of the functions from
the standard EPROM set are no longer available. These
include:
• Frequency reference memory settings
An-05 through An-08
• Settings
0C and 05 for Sn-15 through Sn-18
• Slip compensation (bn-08, Cn-34, Cn-35).
The reference input and feedback input connections
needed for PID operation depend on whether or not the
AI-14B option card (Model No. DS387) is present.
Although the card is not a requirement for PID operation,
its presence allows greater flexibility of the reference
input connection.
The function of the GPD 503 control circuit with the PID
software in place can be understood by studying the
block diagrams in Figures 1, 2 or 3.
Figure 1 shows operation without the AI-14B card. The
reference (setpoint) is either an input signal at term. 16
or a memory setting (An-01 through An-04, or An-09).
The feedback input is at either terminal 13 or 14,
depending on the type of signal used. The feedback
signal is eventually subtracted from the reference signal
to produce an error signal. The PID algorithm processes
this error signal. The output from the PID algorithm
commands the drive to output a specific frequency.
Operation with the AI-14B card (Figures 2 & 3) is similar.
The reference (setpoint) input is either an input signal at
terminal 13, 14 or 16, or a memory setting (An-01 thru
An-04, or An-09). The feedback input is channel 1,
channel 2, and /or channel 3 of the AI-14B card.
INSTALLATION
CAUTION
This option contains electrostatic sensitive
devices. Personnel must be properly grounded
before removing and installing carton contents.
1. Turn off all electrical power to drive.
2. Remove drive front cover. Verify that CHARGE
indicator lamp inside drive is off.
3. Use a voltmeter to verify power has been discon-
nected at incoming power terminals (L1, L2 & L3).
WARNING
Hazardous voltage can cause severe injury or death.
Lock all drive power sources in “OFF ” position.
