SPM Machine Guard MG4-REF11A, Инструкция по эксплуатации

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Machine Guard MG4-REF11 A 7
SPM Instrument AB • Box 504 • SE-645 25 Strängnäs • Sweden Technical data are subject to change without notice.
Tel +46 152 225 00 • Fax +46 152 15075 • info@spminstrument.se • www.spminstrument.com ISO 9001:2000 certified © SPM 2017-09. 71947 B
Transducer inputs
The coaxial cable from the shock pulse transducer is connected to a TNC connector on the underside
of the MG4-REF11A unit. The vibration transducer is connected via a shielded twisted pair cable
to the input terminals on the circuit board inside the unit (fig.1) or to a TNC connector (option)
underside of the unit. The TNC connector for SPM is closest to the front panel, the connector for
VIB closest to the rear side of the housing.
Recommended vibration transducers are SPM type SLD or IEPE (ICP
®
) type transducers with bias
6 to 14 VDC and sensitivity 0.9 to 12.0 mV/m/s
2
. Vibration transducers of type SLD are isolated
from machine ground. The cable shield shall be connected in one end only, preferably to the earth
terminal. The cable shield shall not be connected to the earth terminal in cases where the shield
already is connected at the transducer end.
The cable inlets (M12) are intended for measuring
cables with diameter 5 mm (IP65).
Relays
The relay specifications are 250 Vac / 5 A /1250 VA for the main relay (Relay 1, connectors 4-5).
The four secondary relays are specified 125 Vac / 1 A / 60 VA (150 Vdc / 1 A / 30 W). As default,
the relays are NC = normally closed and open on alarm or power failure. You can change that to
NO = normally open when programming the unit, see page 11.
Analog outputs
The four analog outputs (fig.2) have no galvanic separation, but a common earth connection. In
case galvanic separation is required, the user must supply a suitable insulation module.
Check supply current
type and voltage
Note relay channel
numbering
Note analog channel
numbering
Use correct transducer
connector
Default: NC
Fuse
Please note:
Regarding the outputs: analog output channels and relays can be linked to any of the input chan-
nels by programming the MG4-REF11A, see page 14.
When TLT is set to ON (page 11), the MG4-REF11A indicates TLT fault (fault on transducer line
test) when the transducer is not connected or when the transducer line is not OK (open or short
circuit for VIB, TLT value below 15 for SPM). This will cause the connected analog output to go to
approx. 0 mA. Setting TLT to OFF prevents the analog output from dropping below 4 mA.
1
2
+(A) –(B)
Twisted pair cable to
vibration transducer
Ground
shield
Analog outputs
Ch. 4 Ch. 3 Ch. 2 Ch. 1
A
4-20mA
Max. loop
resistance 400 Ω
Vibration input
Channel 1