The Honeywell RM7888A Relay Module is a microprocessor
based, integrated burner control for industrial process semiauto-
matically fired gas, oil, coal, or combination fuels for single and
multiple burner industrial applications. The RM7888A requires a
Relay Module, Subbase and Amplifier for operation. Options
include Personal Computer Interface, Keyboard Display Module,
DATA CONTROLBUS MODULE™, Remote Display Mounting,
First-Out Expanded Annunciator and COMBUSTION SYSTEM
MANAGER™ software. The RM7888 intended use is in conjunc-
tion with a master system control. The master system control
determines the purge timing and confirms air supply and air flow.
The RM7888A is programmed to provide a level of safety,
functional capability and features beyond the capability of con-
ventional controls.
The basic functions of the RM7888 include automatic burner
startup sequencing, five user selectable operating (run) sequences,
four line voltage sequence control inputs (commonly controlled
with a Programmable Logic Controller [PLC)], flame supervi-
sion, system status indication, system or self-diagnostics and
troubleshooting.
Safety features:
- Closed loop logic test.
- 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.
First-out annunciation and system diagnostics are provided
by 2 row by 20 column Vacuum Fluorescent Display (VFD)
located on the Keyboard Display Module.
First-out expanded annunciation with 26 light emitting di-
odes (LEDs) for limits and interlocks (optional).
Five sequence information LEDs.
Interchangeable plug-in flame amplifiers.
Local or remote annunciation of RM7888A operation and
fault information.
Dependable, long-term operation provided by microcom-
puter technology.
Nonvolatile memory for retaining history files and sequenc-
ing status after loss of power.
Remote reset capability (optional).
Burner controller data:
- Sequence status.
- Sequence time.
- Hold status.
- Lockout/alarm status.
- Flame signal strength.
- Expanded annunciator status.
- Total hours of operation.
65-0175
RM7888A Relay Module
G.R. • 8-94 • ©Honeywell Inc. 1994 • Form Number 65-0175
7800 SERIES
- Total cycles of operation.
- Fault history of 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 line voltage digital inputs.
• Software revision and version of RM7888A via S7800
Keyboard Display Module.
• Status of configuration jumpers.
CONTENTS
Specifications ......................................................... 2
Installation ........................................................... 11
Wiring .................................................................. 12
Assembly .............................................................. 15
Operation ............................................................. 19
Checkout .............................................................. 36
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65-0175