TM 10-6665-297-13&P
2-7.2.2
To modify CD800 and CD830 control units for automatic resetting:
1.
Remove diodes from control unit printed circuit boards as follows:
a. For automatic resetting of warning circuitry only (retaining manual alarm circuitry resetting):
Clip leads of diode CR3 and remove diode.
b. For automatic resetting of alarm circuitry only (retaining manual warning circuitry resetting):
Clip leads of diode CR2 and remove diode.
c. For automatic resetting of both warning and alarm circuitry: Clip leads of diodes CR2 and CR3
and remove diodes.
2.
If both warning and alarm functions are modified for automatic resetting:
CD830 only: Grasp RESET lens with fingers and withdraw from socket. Replace with unlabeled red
lens 0104-6286. (Unlabeled red lens is standard for CD800W control unit front panels.) If manual
resetting is retained for
either warning or alarm circuitry, do not replace the CID830 RESET lens.
2-8
INSTALLATION OF EXTERNAL ACCESSORY DEVICES
The CD800/830 module provides terminals for accessory devices such as chart recorders, remote
alarms, relays, and switches. Instructions for installation of these accessories are contained in the
following paragraphs.
2-8.1
INSTALLATION OF RECORDER. Connect recorder as follows: Individual control modules are
compatible with 0-100 mV recorders having an input impedance greater than 100 ohms.
NOTE: A multipoint recorder used to scan outputs from several modules must have a non-shorting
commutator (selector switch) to avoid momentary connecting of two module recorder signal
outputs together.
1. Connect recorder to REC + and - terminals on module terminal panel (CD800P: to terminals TB-2, 4(-)
and 5 (+).
2. Press and hold down TEST pushbutton. If necessary, adjust RANGE control R22 for full-scale meter
deflection.
3. Observe recorder response at full-scale meter reading at control module.
23-9617
3/16/79
2-42
