ABB Sace Emax UL Listed, Инструкции по установке, обслуживанию и техническому обслуживанию

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Emax UL
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13. SACE PR112/P-A trip unit – Identification
The PR112 units available according to the ANSI/UL Standards are:
•
PR112/P-A (LSI)
• PR112/P-A (LSIG)
• PR112/PD-A (LSI fitted with communication card).
• PR112/PD-A (LSIG fitted with communication card).
13.1 Standard
The PR112 /P-A has been designed to work in accordance with the following international standard:
Low voltage AC and DC power circuit breakers used in enclosures ANSI/UL 1066.
13.2 Specifications
13.2.1 General
The PR112 unit carries out the Protection, Measurement, Watchdog, Signaling, Test, Power circuit breaker Control, Communication and
Storage functions for low voltage ‘EMAX’ series air three-pole and four-pole power circuit breakers. The protections available are:
Table 1 Protections available
Symbol Protection against …
L overload with inverse long time-delay
S short circuit with adjustable delay
I instantaneous short circuit
G ground fault with adjustable delay
U phase unbalance (signalling only)
O T temperature out of range
K load control
Iinst ultra rapid instantaneous short circuit (for high currents)
The protections can be made in three-phase or three-phase with neutral mode according to of the type of power circuit breaker used (three-pole,
three-pole with external neutral or four-pole). The unit is made using electronic digital technology and interfaces with the user with an alphanumerical
display and membrane control keyboard. The protection parameters and in general the operating method of the unit are completely programmable
by the user in 5 different languages.
The unit carries out opening of the power circuit breaker in which it is integrated by means of the SA, which acts directly on the mechanical operating
mechanism of the apparatus.
13.3 Electrical characteristics
Nominal operating frequency 50/60 Hz ±10%
Pass band 600 Hz max
Peak factor 2.1 max @ 4 In
MTBF 15 years @ 45°C
13.3.1 Self-supply
All the protection functions are operational without an external auxiliary power supply. In fact, self-supply is guaranteed by the CT installed in the
power circuit breaker.
Minimum busbar current for turning the trip unit on:
– 0.35xIn with single-phase current (0.50xIn for turning the display on as well)
– 0.20xIn with two-phase current (0.30xIn for turning the display on as well)
– 0.15xIn with three-phase current (0.20xIn for turning the display on as well)
The display lighting up time is about 3 s.
13.3.2 Auxiliary power supply
The unit operates regularly under self-supply, i.e. guaranteeing the configuration and protection of the power circuit breaker controlled.
When there is an auxiliary power supply, supplied by a galvanically separate converter, it is also possible to use the unit with the power circuit
breaker open or with the power circuit breaker closed but with insufficient current to supply the device. Furthermore, the display is rear-lit, allowing
data readout even in the dark. The PR112 time for reaching service operation, from the moment of connection of the Vaux is about 3 s.
Since a round-insulated Vaux is required, it is necessary to use “galvanically separate converters” complying with the
IEC 60950 (UL 1950) Standards or their equivalent [which guarantee a common mode current or leakage current (see IEC 478/1,
CEI 22/3) not higher than 3.5mA], IEC 60364-41 and CEI 64-8.
Characteristics PR112/P-A version
Power supply voltage 24V DC ±20%
Maximum ripple 5%
Inrush Current @ 24 V ~3A for 30ms
Start-up Current @ 24 V ~1.0A for 150ms
Continuous current rating @ 24 V
~125mA
Nominal Power @ 24 V ~3W
Courtesy of NationalSwitchgear.com