User guide

Appendix Watlow Power Series ■ A.3
All Units (continued)
Single Phase Units
Multizone Units
3 Phase, 2-Leg Units
3 Phase, 3-Leg Units
• For 3 phase, 3 grounded wye models only, reference
connections must be connected to neutral. (See page
3.5 for wiring.)
• In the Setup Page, Setup Control Zone 1 menu,
select the load type for Zone 1.
• Reference is not connected for 3 phase, 3-
leg grounded wye unit.
• Load Type Select [type] for 3 phase is
set to unconfigured [none].
No Heat
Corrective ActionProbable CauseIndication
• If power is not routed through or connected to the
internal bussbar, Ref. 1 or 3 (not both) must be
connected to middle line. (See page 3.4 for wiring.)
• In the Setup Page, Setup Control Zone 1 menu,
select the load type for Zone 1.
• Power not routed through the internal
bussbar. Controller will indicate [`alr]
(Line Loss Alarm) [line].
• Load Type Select [type] for 3 phase is
set to unconfigured [none].
No Heat
Corrective ActionProbable CauseIndication
• When using the multizone feature, the 2 or 3 zones
should be wired so that no two phases are 180° out
of phase. See wiring diagram page 3.5, Figure 3.5C.
• Two phases are 180° out of phase of each
other.
No current
monitor on the
display.
• Reference connections to other lines or neutral must
be made appropriately for each zone. (See page 3.5
for wiring.)
• Reference not connected.No Heat
Corrective ActionProbable CauseIndication
• If power is not routed through or connected to the
internal bussbar, Ref. 2 must be connected to another
line or to neutral. (See page 3.4 for wiring.)
• Power not routed through the internal
bussbar. Controller will indicate [`alr]
(Line Loss Alarm) [line].
No Heat
Corrective ActionProbable CauseIndication
• Refer to page 2.1; insure the fuses have the correct
current rating.
• Refer to page A.6 for guidelines on proper torquing of
fuses.
• Refer to page 2.3 for enclosure guidelines and how to
determine how much cooling is required.
• Replace heater.
• Improper fuse current rating.
• Fuses improperly torqued.
• Inadequate ventilation or cooling in the
cabinet.
• Intermittent short in heater.
Frequent
Nuisance Fuse
Blowing
Corrective ActionProbable CauseIndication
Phase angle
control ramps
output power
up, develops a
[hCyL] error
and shuts down
• Inductive load causing half cycle line
loss errors [hCYL] . Reactance delay
[rdLy] is set too low.
• Increase [rdLy] value until the half cycle line loss
errors no longer occur..