Bell & Gossett S12596B Technologic 350 Pump Controller - Manual (Page 15)

15
SECTION 6 – MANTENANCE
6.0
Preface: The following is a description of the hard-
ware, diagnostics, and corrective action to maintain a
process being controlled by the Technologic 350.
NOTE: The following should not be interpreted as the
maximum configuration of this controller, rather this
describes its application as a Technologic 350 only.
6.1 TECHNICAL OVERVIEW
The Technologic 350 is a micro-processor based
dedicated pump controller unique to and exclusively
manufactured by Bell & Gossett. All aspects of
this unit are strictly proprietary to Bell & Gossett.
It consists of 3 electronic assemblies. The first assem-
bly consists of 3 circuit boards, i.e., display, key-
board, and central processor unit (CPU) and is
referred to as the operator interface panel (OIP).
This operator interface is connected (with ribbon
cable) to a large board assembly known as the
input/output (I/O) board. This board contains a 24 volt
DC power supply to power the unit, all I/O, and a lim-
ited number of sensors. It also has the terminals to
connect to external devices. All hard wire interface to
the outside world resides on this board and is pro-
tected from the external environment.
The third electronic assembly is the power board
which connects to the OIP with a special cable. This
board senses amps, voltage, and calculates the total
power for staging and display on the OIP.
6.2
DIGITAL INPUTS
The controller has provision for digital inputs with a
voltage operating range of 22 to 26.4 VDC. This signal
voltage must be obtained from the on-board 24 VDC
power supply. Eighteen terminals are provided with 6
of these terminals used to connect to the 24 VDC
power supply.
It is not recommended that other power sources
be used without factory approval.
The terminal will accommodate (2) No. 18 AWG wires.
6.3
DIGITAL OUTPUTS
The controller has provision for relay outputs to con-
trol 120 V 50/60 HZ devices.
Sixteen terminals are provided. All terminals will
accept up to (2) No. 14 AWG wires.
The relays are not removable. If defective the I/O
board must be returned to the factory for repair.
All relays operate as single pole single throw.
Components are provided to reduce contact arc and
extend electrical life.
6.4
ANALOG INPUTS
Analog inputs are provided on the I/O board for
process variables and for flow readout. All analog
inputs operate at 4-20mA. They may be powered
from 24 VDC on board or self powered, in any mix,
without isolators.
Each analog input has 4 terminals associated with it,
i.e., 2 for signal input, 1 for 24 VDC, and 1 for shield
chassis ground.
Each analog input terminal will accommodate (2) No.
18 AWG conductors.
6.5 MEMORY
6.5.1 The EPROM is the only removable chip. However, it
is not recommended that it be changed by other than
the factory.
The EPROM is programmed by Bell & Gossett and
its code is copyrighted. On power up the software
version is displayed as
FW RELEASE VX.XX on the
top line and unit assembly serial No. on the bottom
line.
6.5.2 The EEPROM holds all data entered by the operator.
It is not removable. Old data is erased with new. All
data may be erased by the factory at which time all
data reverts back to default values published else-
where in this manual.
6.5.3 The RAM chip is not replaceable and requires no
maintenance.
6.6
CPU
The CPU does not require any maintenance, and can-
not be replaced as a field repair.
6.7
POWER SUPPLY
The power supply provides 24 VDC for all digital and
analog signals. It is specifically rated only for the con-
troller and other loads should not be applied without
factory approval.
The power supply also supplies 5 VDC for all TTL
devices.
The power supply is protected with Fuse F1 located
near the 120 VAC line terminals.
6.8
DIAGNOSTICS (SERVICE TEST)
The Technologic 350 has built in I/O diagnostic capa-
bilities activated with a SERVICE TEST key while in
normal message scroll. It consists of 2 menus, i.e.,
read only and read/write. Read/write overrides the
program and requires a security code.
NOTE: Service test cannot be used if any of the fol-
lowing occur.
1. Power is off.
2. Display and or the start/stop LED is off (red or green).
3. Watch dog LED (CR6) on the I/O board is on.