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3. Lock out and reset
The unit can be reset or brought into lock out mode in two
different ways:
Internal
In the lock out case the unit can be reset by pushing the built-
in button meaning a new start-up cycle is performed.
External
Instead of using the built-in lock out button the same
function can be achieved by using an external button which
connects terminal 9 with A (see also circuit and block
diagram).
If the pushputton (internal or external) is pressed during
normal operation or during the start sequence for more then
3 sec. and afterwards released, the control box will perform
a shutdown.
Please note
The unit can only be brought to lockout mode or
be reseted if power is applied to the unit.
4. Low-voltage protection
at 220 / 240V (110 / 120V) nominal voltage
The mains voltage has to be more than 187 V
order to allow the unit to perform a start-up.
The mains voltage is not only monitored in the start-up
phase but also permanently during operation. If the voltage
drops below < 160 V
(80 V
eff
eff
control box goes into lock out mode. If the voltage rises
again, the control box performs automatically a start-up as
soon as the mains voltage is > 187 V
5. Safety
The design and control sequence of the DMG 970 controls
will comply with the currently applicable standards and
regulations (see also TECHNICAL DATA).
(94 V
) in
eff
eff
) during start-up or run time the
(94 V
) .
eff
eff
6. Mounting and electrical wiring
Wiring base:
– 3 earth terminals with additional terminal for burner
earthing
– 3 neutral terminals with internal permanent connection to
neutral terminal 8
– 2 independant spare terminals (S1 and S2)
– extra terminals A, B and C are standard
– 2 slide-in plates and 2 easy knock out holes (PG11
thread) plus 2 knock out holes in the base bottom faciliate
the base wiring
The digital controls are ideally wiried on the new wiring
bases S98, which are equipped with (terminals B and C are
only for some special types of DMO or DMG) terminal A,.
which is used for the remote reset / remote lockout functions.
Please note
To assist trouble-free operation the main neutral
connection terminal in the wiring base must be
fully tightened. The terminal screws are already
in the undone position. To connect a wire to the
terminal, the screw only needs to be fastened.
General: The control box and detector probes should not be
subjected to excessive vibration.
3
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