Littelfuse PGR-3200, Руководство пользователя

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PGR-3200 Insulation Monitor
Page 1
Rev. 3-E-040918
1. G
ENERAL
The PGR-3200 Insulation Monitor measures phase-to-
ground resistance to detect electrical-insulation failure in
an ungrounded power utilization system. It provides three
levels of detection with a 50-k

warning with an LED and
output contact indication, a 30-k

warning with LED
indication, and a 10-k

alarm with LED and output contact
indication. An analog output is provided for predictive
maintenance trending.
The PGR-3200 can be used to detect faults in
ungrounded systems up to 6 kV. It can be directly
connected to a system up to 1.3 kV, single or three phase,
50 or 60 Hz. A PGH-series high-tension coupler is
required for 5- and 6-kV systems.
2. O
PERATION
The PGR-3200 actively monitors insulation resistance
when it is connected to the supply voltage. All conductors
connected to the monitored circuit are included in the
insulation measurement. See Fig. 2.
2.1 R
ELAY
O
PERATING
M
ODE
The PGR-3200 output relays operate in the non-fail-safe
mode; they energize when an insulation warning or alarm
occurs.
2.2 F
RONT-
P
ANEL
C
ONTROLS
2.2.1 R
ESET
The front-panel RESET switch is used to reset latching
trips. Cycling the supply voltage will also reset the PGR-
3200. See Section 2.5.
2.2.2 T
EST
All LED’s will light and output relays will energize when
the TEST button is pressed for at least 8 s.
2.3 F
RONT-
P
ANEL
I
NDICATION
2.3.1 P
OWER
The green LED’s labelled PWR indicates presence of
supply voltage.
2.3.2 I
NSULATION
W
ARNING
The red LED’s labelled 50 k

and 30 k

will light when
those respective insulation resistance values, or lower are
measured.
2.3.3 A
CTIVE
The red LED labelled ACTIVE indicates the monitor is
enabled.
2.3.4 I
NSULATION
A
LARM
When insulation resistance measures 10 k

or less, the
red LED labelled <10 k

will light.
2.4 A
NALOG
O
UTPUT
A non-isolated, 0- to 1-mA output (terminals 25 and 26)
indicates insulation resistance. The metering output relates
to an insulation-resistance range of 0 to infinity using
optional meter PGA-0510. See Figs. 2, 3, and 6.
2.5 R
EMOTE
R
ESET
When remote-reset terminals 18 and 19 (alarm) or 21 and
22 (warning) are connected, a warning or alarm remains
latched until the RESET switch is pressed or the remote-reset
terminals are momentarily opened.
If the remote-reset terminals are not connected, the
PGR-3200 operates in non-latching mode; a warning or
alarm will reset when the fault is removed.
2.6 R
EMOTE
T
EST
When terminal 29 is connected to ground the monitor will
alarm. See Figs. 2 and 3. Response to a test input can take
several seconds.