Bell & Gossett S13641B Technologic 5500 Series Pump Controller - Manual (Page 30)

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Section 5 - Maintenance
5.0 Preface: The following is a description of the hard-
ware, diagnostics, and corrective action to maintain a
process being controlled by the Technologic 5500
Pump Controller.
NOTE: THE FOLLOWING SHOULD NOT BE INTER-
PRETED AS THE MAXIMUM CONFIGURATION OF
THIS CONTROLLER, RATHER THIS DESCRIBES ITS
APPLICATION AS A TECHNOLOGIC 5500 PUMP
CONTROLLER ONLY.
5.1 TECHNICAL OVERVIEW
The Technologic 5500 Pump Controller is a micro-
processor based dedicated pump controller unique
Gossett. All aspects of this unit are strictly proprietary
to Bell & Gossett.
The operator interface is connected (with a serial
cable) to the CPU assembly.
The CPU is mounted to a rack which allows connec-
tion to the analog and digital input/output modules.
5.2 DIGITAL INPUTS
The controller has provision for digital inputs with an
operating voltage of 24 VDC. This signal voltage must
be obtained from the 24 VDC power supply mounted
to the subpanel.
It is not recommended that other power sources
be used without factory approval.
Customer connections are made directly to the termi-
nals mounted on the digital input module.
5.3 DIGITAL OUTPUTS
The controller has provision for relay outputs to con-
trol 120 V 50/60 HZ devices.
The relays are not removable. If defective the digital
output module 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.
Customer connections are made directly to the termi-
nals mounted on the digital output module.
5.4 ANALOG INPUTS
Analog inputs are provided for process variables and
optional transmitters. All analog inputs operate at
4-20mA. They must be powered from 24 VDC power
supply included with the controller
5.5 MEMORY
The logic is stored in a non-removable EEPROM chip
which can only be updated from the RS-232 program
port on the CPU. The user setup data is stored in
non-volatile memory or fixed RAM. The fixed RAM
requires power to hold the information. While the
controller is powered up the CPU controller provides
the power to save the user values. When the con-
troller is powered down a 3V Lithium battery provides
the power to store the user values. When the battery
voltage drops below 2.5 VDC the controller will dis-
play *ALARM*. After pressing the HELP key the dis-
play will indicate # of # Low Battery. You will have
approximately 25 weeks to replace the battery before
losing memory due to an under voltage condition
during a power loss.
5.6 CPU
The CPU does not require any maintenance, and
cannot be replaced as a field repair.
5.7 POWER SUPPLY
The power supply provides 24 VDC for all digital and
analog signals as well as the CPU. It is specifically
rated only for the controller and other loads should
not be applied without factory approval.
The power supply is protected with 500 mA fuses on
the primary and secondary circuits
The 24 VDC power supply includes overvoltage pro-
tection circuitry. After detecting high output voltage
the power supply will trip. 0.7 to 0.8 volts DC is pre-
sent at the output of the device indicating an over-
voltage trip. To reset remove power from the power
supply by cycling the 115 VAC control power. If
the power supply does not reset it may require re-
calibration. To recalibrate you will need a DC
voltmeter and a screw driver. The following steps
detail calibration of the power supply:
1. Turn the silver overvoltage protection (OVP) pot.
(labeled R1, located just to the left side of the
transformer) fully clockwise.
2. Turn the voltage adjustment pot. (labeled R9,
located below the left-hand corner of the trans-
former) fully counter-clockwise.
3. Cycle power.
4. Turn R9 fully clockwise (you should read approxi-
mately 27 VDC at the output).
5. Slowly turn R1 counter-clockwise until the unit
trip and displays approximately 0.77 VDC at the
output.
to and exclusively manufactured by Bell &