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15 Appendices
15.1 PR021/K outside signalling unit
15.1.1 General information
The signalling unit converts the digital signals provided by the protection units into electrical signals by means of normally-open electric contacts.
Information on the status of the protection functions transits on a dedicated serial line connected to the release.
The following signals/contacts are available:
- L overload prealarm (the alarm signal remains enabled throughout the overload, until the release has been tripped)
- protections timing and trip (the protections trip signal remains enabled during the timing-controlled phase and after the release has been tripped)
- I protection trip
- timing and overheating threshold overrun
- two contacts for load control
- release trip
- communication error on serial line (connections between protection and signalling units)
- polarity unbalance.
By setting the DIP switches, you can configure the signals of 7 programmable contacts, This can be done by selecting them directly in the PR122/
DC or PR123/DC relay via PR010/T, SD-Testbus 2 or SD-Pocket, choosing from a long list.
Two contacts available on the SACE PR021/K (load control) unit enable you to control a release for opening and closing the circuit-breaker. These
contacts enable various applications, including load control, alarms, signals, electric cutouts.
A Reset button enables you to zero the status of all the front optical signals and return the relays' contacts to the resting position.
The unit also contains ten LEDs to display the following information:
- Power ON: auxiliary power supply on
- Tx(int Bus): flashing synchronized with dialogue with the Internal Bus
- Eight LEDs associated with the signaling contacts.
15.1.2
Power supply
Auxiliary power supply
Maximum ripple
Rated power @ 24 V
15.1.3
General characteristics of the signalling relays
The following data are defined for resistive loads
Type of contact
Maximum switching voltage
Maximum switching current
Maximum switching power
Breaking capacity @ 35
VDC
Breaking capacity @ 120 VDC
Breaking capacity @ 250 VAC
Breaking capacity @ 380 VAC
Contact/coil insulation
Contact/contact insulation
15.1.4
Relay functions
The available contacts can be used to manage the respective relays indicating an event (a given situation in the state of the device) that prompts
the required relays to be independently enabled after the delay specified by the user. The function is entirely similar to the one described in the
PR120/K signalling module in par. 14.3 and 15.3 of this manual.
15.1.5
PR021/K signalling unit menu
The unit's functions are accessible from the operator panel (PR123/DC and PR122/DC where applicable)
Modules
COM Module
SIGNALLING Module
Local Bus Unit
Unit configuration
L3447
Model
L3728
24 V DC +/-20%
5%
4.4 W
SPST
130 VDC
5 A
175 W
5 A
0.2 A
----
----
4/4
Local Bus Unit
Presence
Enter ↵ + PWD
Relay n.1
Relay n.2
380 VAC
8 A
2000 VA
----
----
8 A
5.2 A
4000 Veff
1000 Veff
1/8
Present
Apparatus
Doc. No.
Relay n.1
Signal source
Enter ↵
Delay
NO / NC
Emax DC
1SDH000635R0002
1/4
None
Scale
Page No.
85/108
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