Turbo Chef Technologies 3240 manual 2 4 OVEN SYSTEMS

2 4 OVEN SYSTEMS

3.	If the resistance readings are correct,	Testing Procedure
	reconnect the motor wiring and then apply	WARNING: Capacitors within the CMSC
	line voltage to the unit and check for
		can retain charge after power is removed.
	voltage applied to the motor windings.
		Exercise extreme caution when handling the
4.	If no voltage is present, ensure the CMSC is	terminals.
	operating properly (see below).	WARNING: DO NOT connect incoming
5.	If CMSC is operating properly, inspect the	AC power to output terminals U, V, or W.
	wire harness for damage or shorts.	This will seriously damage the Conveyor
6.	If the wire harness is intact and undamaged,	Motor Speed Controller.
	and the CMSC is operating properly, the	1. Ensure that no faults appear on the display
	gear drive is damaged or defective and must	of the CMSC during oven operation. The
	be replaced (page A-8).	control will display the frequency output if
		the system is operating correctly.

Gear Drive (Conveyor Motor) Speed Controller (CMSC)

The CMSC converts single-phase line voltage to a three-phase output. The speed of the gear drive is controlled by the frequency output of the CMSC. The CMSC receives an input voltage (0-10 VDC) from the control board and adjusts the frequency output to the gear drive.

2.Check the input voltage on terminals L1 & L2 and the DC voltage input on terminals 0V & AI (0.1-10 VDC).

3.Check ohms of motor (Figure 30).

4.If no voltage is present, inspect the wire harness for damage or shorts (page 45).

5.If wire harness is intact and undamaged, the CMSC is damaged or defective and must be replaced.

ºF

0º

+20º

+40º

+60º

+80º

+100º

+120º

+140º

+160º

+180º

+200º

0º

90.03W

97.39W

101.74W

106.07W

110.38W

114.68W

118.97W

123.24W

127.50W

131.74W

135.97W

+200º

135.97W

140.18W

144.38W

148.57W

152.74W

159.90W

161.04W

165.17W

169.29W

173.39W

177.47W

+400º

177.47W

181.54W

185.60W

189.64W

193.67W

197.69W

201.69W

205.67W

209.64W

213.60W

217.54W

+600º

217.54W

221.47W

225.38W

229.28W

233.17W

237.04W

240.90W

244.74W

248.57W

252.38W

256.18W

ºC

0º

+10º

+20º

+30º

+40º

+50º

+60º

+70º

+80º

+90º

+100º

0º

100.00W

103.90W

107.79W

111.67W

115.54W

119.40W

123.24W

127.07W

130.89W

134.70W

138.50W

+100º

138.50W

142.29W

146.06W

149.82W

153.58W

157.31W

161.04W

164.76W

168.46W

172.16W

175.84W

+200º

175.84W

175.91W

183.17W

186.82W

190.45W

194.07W

197.69W

201.29W

204.88W

208.45W

212.02W

+300º

212.02W

215.57W

219.12W

222.65W

226.17W

229.67W

233.17W

236.65W

240.13W

243.59W

247.04W

Figure 29: Temperature/Resistance Relationship Class B. Resistance @ 0ºC = 100.0, Alpha = 0.003850

To

From

Description

Expected Resistance

White

Grey

Winding (A-B)

215-217 W

White

Black

Winding (A-C)

215-217 W

Grey

Black

Winding (B-C)

215-217 W

Black, Brown, or

Green

Windings to

Open

Blue

chassis

Figure 30: Conveyor Motor Ohm Chart