EFD MINAC 25 Twin, User Manual, Page: 40 / 42

MINAC Systems Revision A
USER MANUAL 31 January 2005
63860.doc
© For reproduction rights, see cover page. Page 37
Alarm Probable Cause Corrective Action
Water flow low
Indicates insufficient
water flow through the
cooling circuit.
– Insufficient water flow
through the converter
module heat sink.
– Clogged water filter in
water inlet terminal
– Insufficient water flow
through the HHT.
– Insufficient water flow
through the induction coil.
1. Check that external manual valves
and solenoid valves are open.
2. Make sure that cooling water supply
to the frequency converter is
adequate, i.e., 4 bar/58 psi differ-
ential pressure minimum, 3/4" inlet
hose minimum, and minimum water
flow. (See nameplate)
3. Clean the inlet water filter. There is
access to this filter on the outside.
Unscrew the hose tail for the water
inlet, retract the filter and clean with
compressed air.
4. Make sure that the heating coil
allows for enough water flow.
Redesign the coil if necessary.
5. If the EOR function is active, see
paragraph 5.3.2
External Fault
Customer-defined alarm
(e.g., external interlock
alarm, external water
flow alarm, etc)
Emergency Stop
command
Indicates that the
emergency stop has
been activated.
The emergency stop
command has been
activated externally on an
external control unit. 1. Before restarting the unit after an
emergency stop command, find the
reason for the activation of the
emergency stop function.
2. To reset the emergency stop
command function, reestablish the
emergency stop command signal on
the ext. plug.
3. Press the RESET button to make the
unit ready for use.
DC Voltage too low
The DC voltage on the
rectifier is too low.
DC Voltage too high
On twin units these
alarms will stop both
outputs
– The main voltage is too
low.
– One phase is missing.
– There was a temporary
drop in the main voltage.
– The main voltage is too
high
– There was a temporary
high main voltage
1. Check that the main voltage is within
the limit.
2. Make sure that the supply voltage
consists of all three phases.
3. Check that the main voltage is within
the limit.