Advertisement
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 1 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
The mains voltage has to be more than 187 V
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
during start-up or run time the control
eff
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
.
eff
5. Safety
The design and control sequence of the DMG 971 controls
will comply with the currently applicable standards and
regulations (see also TECHNICAL DATA).
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.
General: The control box and detector probes should not be
subjected to excessive vibration.
in order to
eff
3
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.
Advertisement
