Honeywell 7800 SERIES Manual
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Brand: Honeywell
Category: Controller , Control Unit , Monitor , Racks & Stands , Relays
Type: Manual for Honeywell 7800 SERIES
Pages: 28
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1 65-0126—2
7800 SERIES RM7890A,B,C
Relay Module
The Honeywell RM7890 is a microprocessor
based integrated burner control for automatically
fired gas, oil or combination fuel single-burner appli-
cations. The RM7890 consists of the Relay Module.
Subbase and Amplifier are required to complete the
system. Options include Keyboard Display
Module, Personal Computer Interface, DATA
CONTROLBUS MODULE™, Remote Display Mod-
ule, First-Out Expanded Annunciator and COM-
BUSTION SYSTEM MANAGER™ Software.
The RM7890 is programmed to provide a level of
safety, functional capability and features beyond the
capacity of conventional controls.
Functions provided by the RM7890 include auto-
matic burner sequencing, flame supervision, system
status indication, system or self-diagnostics and
troubleshooting.
— Sequence status.
— Sequence time.
— Total cycles of operation.
— Total hours of operation.
— Fault history providing the six most recent faults:
• Cycles of operation at the time of the fault.
• Expanded annunciator data at the time of the fault.
• Fault message and code.
• Hours of operation at the time of the fault.
• Sequence status at the time of the fault.
• Sequence time at the time of the fault.
— Diagnostic information:
• Device type.
• Flame amplifier type.
• Flame failure response time.
• Manufacturing code.
• On/Off status of all digital inputs and outputs.
• Software revision and version of RM7890 and op-
tional Keyboard Display Module.
• Status of configuration jumpers.
CONTENTS
Specifications .................................................2
Ordering Information ..................................... 2
Principle Technical Features .......................... 8
Safety Provisions ............................................ 8
Installation ..................................................... 9
Wiring .......................................................... 11
Assembly ...................................................... 13
Operation ..................................................... 15
Static Checkout............................................. 17
Checkout ...................................................... 19
Troubleshooting ........................................... 25
G. R. • Rev. 2-94 • © Honeywell Inc. 1994 • Form Number 65-0126—2
65-0126-2
■ Safety features:
— Closed loop logic test.
— Dynamic AMPLI-CHECK™.
— Dynamic input check.
— Dynamic safety relay test.
— Dynamic self-check logic.
— Expanded safe-start check.
— Internal hardware status monitoring.
— Tamper resistant timing and logic.
■ Access for external electrical voltage checks.
■ Application flexibility.
■ Communication interface capability.
■ Dependable, long-term operation provided by microcom-
puter technology.
■ First-out annunciation and system diagnostics are provided
by a 2 row by 20 column Vacuum Fluorescent Display
(VFD) located on the optional Keyboard Display Module.
■ First-out expanded annunciation with 26 Light Emitting
Diodes (LEDs) for limits and interlocks (optional).
■ Five (LEDs) for sequence information.
■ Interchangeable plug-in flame amplifiers.
■ Local or remote annunciation of RM7890 operation and fault
information (optional).
■ Nonvolatile memory; RM7890 retains history files and
sequencing status after loss of power.
■ Remote reset (optional).
■ Report generation (optional).
■ Selectable relight or lockout on loss of flame.
■ Shutter drive output (RM7890B).
■ Burner controller data (optional):
— Expanded annunciator status.
— Flame signal strength.
— Hold status.
— Lockout/alarm status.