Ampcontrol HPB - MACHINE COMMUNICATION; HPB Termination Unit (HTU); Machine Type Codes

Ampcontrol Pty Ltd – ABN 28 000 915 542
HPB USER MANUAL
HPBB012 Version 9 – March/2020
Uncontrolled Copy - Refer to Ampcontrol Website for Latest Version
Page 17 of 61
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– NOT TO BE
REPRODUCED IN PART
5 MACHINE COMMUNICATION
5.1 HPB Termination Unit (HTU)
The HTU-1 Remote Termination Unit is a microprocessor based module that is connected between the
pilot and earth at the remote end of the trailing cable to provide machine communication. It is powered
by and communicates via the pilot line. Its non-volatile memory stored the parameters to configure the
outlet as appropriate for that machine (See Drawing HPBM013, in APPENDIX A: DRAWINGS).
The HPB Termination Unit (HTU-1) provides remote stop of the HPB Relay’s controlled outlet by tripping
the Earth Continuity function. The EC LED on the HDM Remote Display Module is illuminated and the
Earth Continuity will need to be reset if “Pilot Latch:On” has been selected. Stop switches are connected
in series with a diode between the stop and earth terminals. Alternately the internal HTU-1 Termination
Module’s diode can be used to terminate the stop loop.
Machine stops can be differentiated from other pilot trips in the HPB Relay’s Event Log by connecting
machine stops into the HTU-1 Module’s “Stop” input instead of being connected in the pilot loop.
WARNING!
Emergency stops must be wired directly into the pilot circuit.
A transient protected internal diode is connected between the diode terminal and earth. When the pilot is
connected to the diode terminal the machine can be used with a conventional pilot protection relay such
as an Ampcontrol PCA Relay but will not operate when connected to a HPB Relay.
If the remote stop function is not required the stop terminal must be bridged to the diode terminal or the
HPB Relay will not energise. The status of the Remote “Stop” input is displayed “HTU: Online Run” or
“HTU: Online Stp” and can be viewed on the HDM Module’s “Pilot and HTU information” page (level 2,
position 1). Also displayed on this page is offline status and pilot information. The HTU-1 software
version and machine type is displayed on position 2.
Level 2, position 3 displays the EC trip count (ECR), the EC shunt/short trip count (ECS), a counter
(Stat) for the number of cycles the HTU has been online (max will depend on EC trip time) and the status
of the HTU run input (Run) where 0 = offline, 1 = run & 2 = stop.
The Remote termination settings are programmed via the HDM Remote Display Module (Section 9, User
Adjustable Settings).
5.2 Machine Type Codes
There are 5 selectable machine type codes available for use in the HTU-1 Termination Unit. The
descriptive code is transmitted to the HPB Relay to identify the type of machine connected to the outlet.
The codes are selected using the HDM Remote Display Module (level 9, position 1):