Table of Contents
Advertisement
HA20 2-Channel Controller
[AND column selections] ANDED WITH [OR column selections] = relay
activation.
For example, if Ch1A1 & Ch2A1 are selected in the AND column and
Ch1A2 & Ch2A2 are selected in the OR column, the logic equation
is [Ch1A1 AND Ch2A1] ANDED WITH [Ch1A2 OR Ch2A2]. This
requires both A1s along with either A2 to activate the relay.
Figure 2-10. Set Relay Logic
• Failsafe controls relay activation for the common relays. Failsafe
ON causes these relays to de-energize during alarm conditions
and energize when there is no alarm.
With Failsafe active, a power failure forces the relay contact to
the alarm position.
• Horn controls how activating this relay will affect the horn driver
circuit connected to J2 on the motherboard. Choices are NO,
STEADY or PULSE (Ex.: The horn can be set to Pulse for
warning. alarm levels and set to Steady for high alarm levels. Thus,
personnel can know which alarm level is present by based on the
pulsing or steady horn).
• Turning Acknowledge ON (not allowed on Relay 1) allows
Relay 2 to be deactivated by an Alarm Reset during alarm
conditions. This is useful if another audible device is being driven
by the relay. The acknowledge feature is not available for Relay
1 since it is often used for driving a warning light and Relay 2
for driving a horn. Using Acknowledge (thus deactivating) when
horn and light are activated could be dangerous since this
deactivates both and no indication of the High alarm remains.
HA20 Technical Manual
2.3.2 Horn / Piezo Menu
• The HA20 display PCB is equipped with a small audible piezo
(NEMA 4X housing only) that chirps when keys are pressed
providing an audible feedback to the operator. It also may be
set to audibly indicate alarm conditions by selecting YES in the
Piezo On menu option (Figure 2-11). This piezo will then mimic
the Horn settings menus described in
• The Horn ACK menu item determines if the Horn Driver output
may be acknowledged by an Alarm Reset. YES causes an
Alarm Reset to silence the horn even though an alarm condition
remains active.
Figure 2-11. Horn/Piezo Menu
2.3.3 Comm Port Menu
The system Comm Port menu allows setting RTU address for the
optional slave Modbus serial port. This slave port may be used to
transfer HA20 data to a host device such as a PC, PLC, DCS or even
another Honeywell Analytics Controllers. The slave port is addressable,
allowing many HA20 controllers to be connected to a single RS-485
cable.
Figure 2-12. Communication Port Menu
2-8
Section
2.3.1.
Advertisement
Table of Contents
