Bell & Gossett 176R0649C Technologic 502 Series Pump Controller - Manual (Page 5)

5
Section 1 Introduction
Type A-1 Controller (1 Pump/1 Drive)
The type A-1 consists of a stand-alone Technologic
502 master with embedded pump controller software
and an electronically controlled automatic bypass.
The bypass can also be activated manually through
the drive keypad.
Type B-3 Controller (2 Pumps/1 Drive)
The type B-3 controller consists of a Technologic 502
master with embedded pump controller software,
contact motor selection, and an electronically con-
trolled bypass. Contact motor selection allows the
controller to alternate between two motors of equal
size, a duty pump and a standby. The duty pump is
controlled to maintain a set point. Selection between
motors is made automatically by the Technologic 502
or by manual selection through a selector switch. The
bypass enables either motor to be driven by 100%
line power while bypassing the controller circuitry.
The Technologic 502 and electronically controlled
bypass are factory wired and mounted to a common
backplate.
Type C-4 Controller (2 Pumps/2 Drives)
The type C-4 bypass consists of a Technologic 502
master and (1) follower drive each with embedded
pump controller software and an electronically con-
trolled automatic bypass. The C-4 controller allows
for duty/standby operation where only one pump is
run at any time. Selection between drive mode or
automatic bypass is determined by the master. The
bypass can also be activated manually through each
drive’s keypad.
Type D-4 Controller (2 Pumps/2 Drives)
The type D-4 bypass consists of a Technologic 502
master and (1) follower drive each with embedded
pump controller software and an electronically con-
trolled automatic bypass. The D-4 controller allows
parallel operation between the master and follower
drive in response to a set point. Drive mode or au-
tomatic bypass is determined by the master. The
bypass can also be activated manually through each
drive’s keypad.
Figure 1-1. Technologic 502 Pump Controller
Purpose of the Manual
This manual is intended to provide detailed information
for the installation and operation of the option
panel used in conjunction with the Technologic
502 Pump Controller. To enable efficient handling
of the equipment, requirements are provided for
mechanical installation, power and control wiring,
proper grounding, and environmental considerations.
Pre-start and start up procedures are detailed.
Also included is a detailed overview of the option
panel bypass function. In addition, programming,
identification and operation of optional components,
and basic troubleshooting instructions are included
as well.
Overview
The Technologic 502 Pump Controller is a variable
frequency drive with embedded pump control software.
It is available in several different configurations.
Drives on a common backpanel are factory-wired
between the master and follower drives and contain
a main disconnect. Configurations may include a
fused disconnect or bypass.