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Dielectric Strength; Control Power - GE B90 UR Series Instruction Manual

Low impedance bus differential system.
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3.2 WIRING
The dielectric strength of the UR-series module hardware is shown in the following table:
Table 3–1: DIELECTRIC STRENGTH OF UR-SERIES MODULE HARDWARE
MODULE
MODULE FUNCTION
TYPE
1
Power supply
1
Power supply
1
Power supply
2
Reserved
3
Reserved
3
4
Reserved
5
Analog inputs/outputs
6
Digital inputs/outputs
7
8
9
Filter networks and transient protection clamps are used in the hardware to prevent damage caused
by high peak voltage transients, radio frequency interference (RFI), and electromagnetic interference
(EMI). These protective components can be damaged by application of the ANSI/IEEE C37.90 spec-
ified test voltage for a period longer than the specified one minute.
Control power supplied to the relay must be connected to the matching power supply range of the
relay. If the voltage is applied to the wrong terminals, damage can occur.
The B90 relay, like almost all electronic relays, contains electrolytic capacitors. These capacitors are
well known to be subject to deterioration over time if voltage is not applied periodically. Deterioration
can be avoided by powering the relays up once a year.
The power supply module can be ordered for two possible voltage ranges, with or without a redundant power option. Each
range has a dedicated input connection for proper operation. The ranges are as shown below (see the Technical specifica-
tions section of chapter 2 for additional details):
Low (LO) range: 24 to 48 V (DC only) nominal.
High (HI) range: 125 to 250 V nominal.
The power supply module provides power to the relay and supplies power for dry contact input connections.
The power supply module provides 48 V DC power for dry contact input connections and a critical failure relay (see the
Typical wiring diagram earlier). The critical failure relay is a form-C device that is energized once control power is applied
and the relay has successfully booted up with no critical self-test failures. If on-going self-test diagnostic checks detect a
critical failure (see the Self-test errors section in chapter 7) or control power is lost, the relay is de-energize.
For high reliability systems, the B90 has a redundant option in which two B90 power supplies are placed in parallel on the
bus. If one of the power supplies become faulted, the second power supply assumes the full load of the relay without any
interruptions. Each power supply has a green LED on the front of the module to indicate it is functional. The critical fail relay
of the module also indicates a faulted power supply.
An LED on the front of the control power module shows the status of the power supply:
LED INDICATION
CONTINUOUS ON
ON / OFF CYCLING
OFF
3-12
FROM
High (+); Low (+); (–)
48 V DC (+) and (–)
Relay terminals
N/A
N/A
N/A
All except 8b
All
G.703
All except 2b, 3a, 7b, 8a
RS422
All except 6a, 7b, 8a
CT/VT
All
CPU
All
POWER SUPPLY
OK
Failure
Failure
B90 Low Impedance Bus Differential System
TERMINALS
TO
Chassis
Chassis
Chassis
N/A
N/A
N/A
Chassis
Chassis
Chassis
Chassis
Chassis
Chassis
3 HARDWARE

3.2.2 DIELECTRIC STRENGTH

DIELECTRIC STRENGTH
(AC)
2000 V AC for 1 minute
2000 V AC for 1 minute
2000 V AC for 1 minute
N/A
N/A
N/A
< 50 V DC
2000 V AC for 1 minute
2000 V AC for 1 minute
< 50 V DC
2000 V AC for 1 minute
2000 V AC for 1 minute

3.2.3 CONTROL POWER

GE Multilin

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