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 28 of 61
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10
SYSTEM CONTROL
10.1 Digital Inputs
The HPB Relay has five digital inputs, which are all voltage free contact inputs. Shorting the two input
terminals together activates them. The inputs are MCI, start, stop, lock and reset.
The status of inputs can be displayed on the HDM Remote Display Module (level 6, positions 2 and 3).
The “Lnk” input shown in the display is used in tests by Ampcontrol Engineers.
10.2 Output Relays
The HPB Relay has output relays to control the main contactor and the circuit breaker (under voltage
control). All relays are fail safe with respect to power supply loss and are controlled on the basis of
protection functions. Relays RL3 operates to initiate the cable fault lockout test. There is one spare relay
reserved for future development. The status of the relays can be displayed on the HDM Remote Display
Module (level 6, position 1).
10.3 Open Collector Outputs
The HPB Relay has eight open collector outputs, which are driven through optocouplers to provide
additional indication if required. These can be used to drive LED’s, or additional relay (with appropriate
drive circuitry). The Ampcontrol Relay Output Module (ROU) enables these indications to be interfaced
with PLC (See Drawing IPA031, in APPENDIX A: DRAWINGS). The eight outputs correspond to the
LED’s on the display module, turning on whenever the corresponding LED is flashing. The signals are
available on the HPB Relay’s base, pins 35-42, and the common is on pin 34.
10.4 Outlet Control
Closing the Start input energises the outlet. Both the remote and local stop buttons will turn off the outlet.
If a remote stop is not required the Stop input must be bridged to earth via a diode at the HTU-1
Termination Module.
10.5 Operational Sequence
Before an outlet can be energised the following conditions must apply:
a. No protection faults present
b. Local stop input open, remote stop loop closed
c. Local Start input closed
Once these conditions are obtained a cable fault lockout test is performed automatically. The start button
must remain closed during the test, which may take up to 25 seconds to complete due to the charging of
the cable capacitance. If the result of this test is satisfactory the HPB Relay goes into the run mode and
the MCR Relay picks up.
The “RUN” LED on the HDM Remote Display Module is illuminated and the open collector output on the
HPB Relay is switched on to provide remote monitoring if required.
A time delay of 5 seconds is allowed for the Main Contactor Interlock (MCI) to close. If it does not close
within this time, then the run mode is exited.
If a stop button is operated which the relay is in run mode, the run is cleared, and the MCR Relay de-
energises. The event log reads “Stopped” or “HTU Stop” depending on which stop button caused the
stop condition. If a stop button is operated during a cable fault lockout test, then the test is aborted.
While the main contactor is closed, the MCI input is continuously monitored. If it opens, the run is cleared
and the MCR relay de-
energises. In this case the event log records “MC Opened” which indicates that
the outlet was turned off by something other than the HPB Relay, e.g. open circuited main contactor coil
or control supply.
