Whiteley Electronics PETS-2, Quick Installation Manual

Page: 29 / 40

PETS-2 Crossing Telephone System
QUICKFIX INSTALLATION HANDBOOK
Page 29 of 40
Issue 2
13/12/99
29
BLOCK 2 - the middle block (pair1 to the left)
Pair Signalbox Level Crossing Description
1a 0V 0V This is the same 0V as provided on Block 1
1b +12V
fused,
100mA
limit +12V fused,
100mA limit This is the same +12V fused as provided on Block 1.
The fuse for this circuit is located on the left hand
side bracket, beneath the ‘anti-static’ wrist strap
connection stud.
2a Call O/P a NA - function is
available, but it
is unlikely to be
used at the
crossing. Volt free relay contact. Operates during an incoming
call ring, either continuous through the period of
ringing or in sympathy with ring cadence. This relay
would normally switch 50V dc to operate a remote
sounder.
2b Call O/P b NA Volt free relay contact, other side of 2a.
3a Alarm 1
O/P a Alarm 1 O/P a MINOR alarm ( non - urgent) volt free contact
(normally open)
3b Alarm 1
O/P b Alarm 1 O/P b MINOR alarm ( non - urgent) volt free contact
(normally open)
4a Alarm 2
O/P a Alarm 2 O/P a MAJOR alarm (urgent) volt free contact (normally
open). Wired to the sounder in the Signalbox JB.
4b Alarm 2
O/P b Alarm 2 O/P b MAJOR alarm (urgent) volt free contact (normally
open). Wired to the sounder in the Signalbox JB.
5a Block
switch-out
input +ve NA Opto-isolated input +ve side. Apply 12V to 58V to
activate Block Switch (box closed/ transfer to distant).
5b Block
switch-out
input -ve NA Opto-isolated input -ve side. This input is isolated and
it may be activated by a voltage from the signalling
equipment, ensure isolation is maintained.
Alternatively, wet the opto using the 0V/ +12V fused
through a volt free contact of the Block Switch.
6a ETH ETH Telecommunications safety earth. Local telephone
circuit cable screens, or earth connection when using
Earth Recall.
6b ETH ETH As above
7a Line 4 + # Line 4 + # short this leg to ETH for Earth Recall (ELR)
7b Line 4 - # Line 4 - #
8a Line 3 + # Line 3 + # short this leg to ETH for Earth Recall (ELR)
8b Line 3 - # Line 3 - #
9a Line 2 + # Line 2 + short this leg to ETH for Earth Recall (ELR)
9b Line 2 - # Line 2 -
10a Line 1 + Line 1 + SB control telephone. Short this leg to ETH for (ELR)
10b Line 1 - Line 1 - SB control telephone