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3. For surface mounting, use the back of the subbase
as a template to mark the four screw locations. Drill
the pilot holes.
4. Securely mount the subbase using four no. 6 screws.
Wiring Subbase
NOTE: There are several different subbase models that
can be purchased. It is important to note which
subbase is compatible with the relay module
when purchasing repair or replacement parts.
Series 1000 Subbase
All relay product codes that start with a 1 (example:
RM7840G1014/U) can be used with existing subbase
Q7800A1005/U. These relays can also be used on the
Series 2000 subbase noted below.
Series 2000 Subbase
All relay product codes that start with a 2 (example:
RM7840G2014/U) can be used with subbase
Q7800A2005/U.
Subbase Compatibility
Any relay module in the 1000 series is fully backward
compatible with any subbase already installed in the field
(Q7800A1005/U, Q7800B1003/U, Q7800A2005/U,
Q7800B2003/U).
Any relay module in the new 2000 series will only be able
to be installed on subbase Q7800A2005/U, and will not be
backward compatible with any Q7800A1005/U legacy
subbases already installed in the field.
RM7897A,C 7800 SERIES RELAY MODULES
IMPORTANT
Make sure to check the relay model number and
check the subbase compatibly prior to ordering or
attempting a new installation or field upgrade.
If you attempt to place a 2000 series relay on a
non-compatible 1000 series subbase, you will
receive an error code of 101. This indicates that
you must a) change out the subbase to a
Q7800A2005/U or b) chose a compatible 1000
series relay module.
WARNING
Electrical Shock Hazard.
Can cause severe injury, death or equipment
damage.
Disconnect the power supply before beginning
installation. More than one disconnect may be
required.
The internal block diagram of the RM7897A,C is shown in
Fig. 1.
1. For proper subbase wiring and sequence chart, refer
to Fig. 2 and 3.
2. For remote wiring of the Keyboard Display Module,
refer to the Specifications for the Keyboard Display
Module. There are two options for the separately
purchased display: 2-line VFD display (65-0090) or
a 4-line LCD display (32-00110), Data ControlBus™
Module (65-0091) or Extension Cable Assembly (65-
0131).
3. Disconnect the power supply from the main discon-
nect before beginning installation to prevent electri-
cal shock and equipment damage. More than one
disconnect can be required.
4. All wiring must comply with all applicable electrical
codes, ordinances and regulations. Wiring, where
required, must comply with NEC, Class 1 (Line Volt-
age) wiring.
5. For recommended wire size and type, see Table 1.
6. For recommended grounding practices, see Table 2.
3
32-00158—03
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