2.1.3 Terminals Description
Note that all the “-” & P- terminals on the low voltage connection strip are common to each other, All of
the circuitry associated with this terminal strip (analogue inputs and outputs) is isolated from earth
potential (i.e. floating). If a VSD is used that has isolated input signal circuitry, link one of the “-”
terminals to an S terminal (e.g. between P- and the adjacent S terminal to its left). If using a VSD and
the VSD signal input circuitry is earthed, do NOT install a link.
ALL TERMINALS MARKED “S” ARE CONNECTED TO MAINS EARTH TERMINAL 66
ON THE MK7 M.M. AND ARE ONLY FOR CONNECTION TO CABLE SCREENS
Terminal Block 1
P- Top Bowdown and Feed water valve position potentiometer
PW Feed water valve position potentiometer
P+ Top Bowdown and Feed water valve position potentiometer
- Cold water make up and boiler steam temperature sensor
T1 Cold water make up temperature sensor
T2 Boiler steam temperature sensor
- Condensate return temperature sensor
T1A Condensate return temperature sensor
PW Top Bowdown valve position potentiometer
- Cold water make up and condensate return flow meter
MF Cold water make up flow meter
CF Condensate return flow meter
I+ Feed water VSD output
V+ Feed water VSD output
- Feed water VSD output
Terminal Block 2
DPC Connections solely dedicated to the Autoflame draft pressure sensor
DPS Connections solely dedicated to the Autoflame draft pressure sensor
DP- Draft pressure sensor & motorised draft control damper voltage –ve
DP+ Draft pressure sensor & motorised draft control damper voltage +ve
DPW Motorised draft control damper potentiometer wiper
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