PD2-6400
Helios High Voltage & Current Meter
www.predig.com
10
Front Panel LEDs
The meter is supplied with four alarm points that include
front panel LEDs to indicate alarm conditions. This standard
feature is particularly useful for alarm applications that require
visual-only indication.
Manual Output Control
Take control of any output with
this feature. All relays can be
forced ON or OFF, and the
4-20 mA output signal can
be set to any value within its
range. When the relays and
4-20 mA output are controlled
manually, an LED labeled “M”
is turned on and the associated
Alarm LEDs (1-8) flash every
10 seconds indicating that
the meter is in manual control
mode.
Sampling Function (PV Triggered Timed Relay)
The sampling function allows the operator to set a relay as a
“sampling” relay. When the PV reaches that set point, it will
close that relay’s contacts for a preset period of time (0.1 to
5999.9 seconds).
Switching Inductive Loads
The use of suppressors (snubbers) is strongly recommended
when switching inductive loads to prevent disrupting the
microprocessor’s operation. The suppressors also prolong the
life of the relay contacts. Precision Digital offers the PDX6901
Snubber with 0.01μF/470Ω flexible leads.
Interlock Relay(s)
This function allows a process to use one or more very low
voltage input signals or simple switch contacts to control the
state of one or more internal “interlock” relays. A violation
(i.e. loss of input, open switch, or open circuit) forces one or
more N/O interlock relay contacts to open. One input can be
used in series with a number of interlock switches, or up to
four inputs can be required to force-on one (or more) internal
interlock relays. Please see
Safety Interlock on the
P
ro
V
u
Series
whitepaper on our website for more information.
1
M
1
M
