RESET Pushbutton
This is a momentary action pushbutton mounted on the printed circuit board within the
enclosure. Its location on the printed circuit board is shown in Figure 2. When pressed,
it’s function is to reset the indicators, relays and outputs and generate reset output
signals after a trouble, warning or alarm has been cleared if so programmed. Disarming
and rearming the control panel may also reset the indicators, relays, and outputs and
generate reset output signals after a trouble or warning has cleared.
The method used to reset the panel depends upon the types of detectors wired on the
detection circuits and the position of DIP switch S3-2. See the
Programming
section of
this manual for more information.
When the control panel is disarmed and the reset button is pressed, power is interrupted
from terminals 28 and 29, the 24 Vdc power source for UV detectors, for 0.5 seconds.
This power interruption provides a signal to reset UV detectors in trouble or alarm.
Terminal Definitions
Each explosion protection system is provided with a specific electrical drawing showing
the field wiring from the control panel to the system components. The drawing shows all
the terminals of the EX 200™. These terminals are described below.
AC Connection, Terminals 1-3 (TB1)
Terminals 1-3 are to be used for the AC power connection. Single-phase power from a
dedicated circuit is to be connected to the control panel using two-conductor plus ground
wire. Wire the hot lead to terminal 1, the common to terminal 2 and the ground to
terminal 3. See the
Electrical Installation
section of this manual for more information.
Alarm Relay, Terminals 4-6 (TB2)
The alarm relay energizes and latches on an alarm (or pre-alarm) condition only. With
the control panel in normal operation (armed with no explosion detected), terminals 4
and 5 are closed and terminals 5 and 6 are open. This relay is normally used to activate
an alarm and/or to operate secondary protection systems. The relay will not de-energize
until the EX 200™ is disarmed
and
the RESET pushbutton is pushed. Contact rating:
5A @ 30 Vdc, 5A @ 240 Vac, resistive loads only.
Trouble Relay, Terminals 7-9 (TB3)
The trouble relay de-energizes on an alarm condition and all trouble conditions except
for the loss of AC power or a battery fault. It can be programmed for latching and non-
latching operation (see
Programming
section of this manual). With the control panel in
normal operation, terminals 7 and 8 are open and terminals 8 and 9 are closed. This
relay is used for interlocking process equipment. NFPA 69 and FENWAL require the
system to be interlocked such that the process cannot run if a trouble is present.
Contact rating: 5A @ 30 Vdc, 5A @ 240 Vac, resistive loads only.
Warning Relay, Terminals 10-12 (TB4)
The warning relay de-energizes only on the loss of AC power or a battery fault. With the
control panel in normal operation, terminals 10 and 11 are open and terminals 11 and 12
are closed. Contact rating: 1A @ 30 Vdc, 0.5A @ 125 Vac, resistive loads only.
FENWAL
Protection Systems
FSS/MC-519 Rev BC
Page 13
