7.2
Solid-state relays check
1. Turn the machine on.
2. Make sure LED indicators are off.
3. Check to see if the mains voltage (208 Vac) presents at L1.
(a) If negative, perform Contactor check, see below.
(b) If Contactor check positive, then disconnect the machine and check the consistency be-
tween L1 and 1. Tighten the terminals or replace the wire if required.
4. Check to see if the mains voltage (208 Vac) presents at L2.
(a) If negative, perform Contactor check, see below.
(b) If Contactor check positive, then disconnect the machine and check the consistency be-
tween L2 and 3. Tighten the terminals or replace the wire if required.
5. Measure the voltage between T1 and L1; it must be 208 Vac. If it reads 0–5 Vac, and LED indicator
is off, and the display of temperature limiter reads increasing values, then the relay is out of order;
replace it.
6. Measure the voltage between T2 and L2; it must be 208 Vac. If it reads 0–5 Vac, and LED indicator
is off, and the display of temperature limiter reads increasing values, then the relay is out of order;
replace it.
7. Run any program (Butterfly or Mushroom).
8. Check T1 to L1 voltage. Whenever LED is on, it must be 0–5 Vac. If it reads 208 Vac while LED is
on, then relay is out of order; replace it.
9. Check T2 to L2 voltage. Whenever LED is on, it must be 0–5 Vac. If it reads 208 Vac while LED is
on, then relay is out of order; replace it.
7.3
Contactor check
1. Turn the machine on. See Fig.8.
2. Make sure OUT indicator is on.
3. Check A1 to A2 voltage; it must be 208 Vac. Otherwise do the following.
(a) Unplug the machine, and check A1 to Q3 for open circuit. Tighten the terminals or replace
the wire if required.
(b) Unplug the machine, and check A2 to 76 for open circuit. Tighten the terminals or replace
the wire if required.
(c) Check the Temperature limit output check, see below.
4. Check 1 and 3 voltage; it must be 208 Vac.
5. Check 1 and 5 voltage; it must be 208 Vac.
6. Check 3 and 5 voltage; it must be 208 Vac.
(a) If no mains voltage presents at 1, 3, 5 then unplug the machine, trace and locate the wires
fault.
7. Check 2 and 4 voltage; it must be 208 Vac.
8. Check 2 and 6 voltage; it must be 208 Vac.
9. Check 4 and 6 voltage; it must be 208 Vac.
Technical service manual 2692
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